US5057682A
Expired / Lapsed
US
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Quiescent signal compensated photodetector system for large dynamic range and high linearity
Assignee: General Electric Co
•
Filing: 1990-11-05
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Granted: 1991-10-15
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Expires: 2010-11-05
Abstract
Abstract The linearity and dynamic range of a photodetector system is enhanced by providing real time cancellation of condition-dependent quiescent output signals from the photosensitive devices by provision of a condition-dependent output signal monitoring device which drives the input section of a current mirror having output sections connected to the active photosensitive devices to zero out the condition-dependent quiescent output signals of those photosensitive devices during system operation. Multiple output sections may be run from a single input section of the current mirror.
Inventors
- 👤 Gerald J. Michon
- 👤 Dale M. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:10
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/032; H03; H03F; H03F3/00; H03F3/04; H03F3/08; H03F3/082; H04; H04N; H04N25/00; H04N25/70; H04N25/701; H04N25/76; H04N25/78
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
166 words
A photodetector system comprising: a plurality of photosensitive devices which exhibit a condition-dependent quiescent output signal; a plurality of output circuits each connected to receive the output signal from a different one of said photosensitive devices; a quiescent signal monitor device having a condition-dependent quiescent output signal which is proportional to that of said photosensitive devices; means for shielding said monitor device from the light to be sensed by said photosensitive devices, whereby the output signal from said monitor device is proportional to the condition-dependent-quiescent-output-signal contributions to the output signals of said photosensitive devices; current mirror means responsive to the output signal from said monitor device for applying quiescent output signal compensating signals to a plurality of said output circuits to compensate for the condition-dependent-quiescent-output-signal contribution to the output signal of each of said photosensitive devices, whereby the output from each of said output circuits is substantially independent of the condition-dependent quiescent output signal of the one of said photosensitive devices to which it is coupled.
Claim 2
Dependent Claim
166 words
A photodetector system comprising: a plurality of photosensitive devices which exhibit a condition-dependent quiescent output signal; a plurality of output circuits each connected to receive the output signal from a different one of said photosensitive devices; a quiescent signal monitor device having a condition-dependent quiescent output signal which is proportional to that of said photosensitive devices; means for shielding said monitor device from the light to be sensed by said photosensitive devices, whereby the output signal from said monitor device is proportional to the condition-dependent-quiescent-output-signal contributions to the output signals of said photosensitive devices; current mirror means responsive to the output signal from said monitor device for applying quiescent output signal compensating signals to a plurality of said output circuits to compensate for the condition-dependent-quiescent-output-signal contribution to the output signal of each of said photosensitive devices, whereby the output from each of said output circuits is substantially independent of the condition-dependent quiescent output signal of the one of said photosensitive devices to which it is coupled.
Claim 3
Dependent Claim
20 words
The photodetector system recited in claim 1 said photosensitive devices are continuous output said photosensitive devices are continuous output devices.
Claim 4
Dependent Claim
14 words
The photodetector system recited in claim 2 wherein: said quiescent signal is a current.
Claim 5
Dependent Claim
50 words
The photodetector system recited in claim 1 wherein: said monitor device is a different size than at least some of said photosensitive devices; and said current mirror means scales the signal applied to said output circuits in accordance with the relative sizes of said monitor device and said photosensitive devices.
Claim 6
Dependent Claim
14 words
The photodetector system recited in claim 4 wherein: said quiescent signal is a current.
Claim 7
Dependent Claim
60 words
The photodetector system recited in claim 1 wherein: said monitor device is a different size than at least some of said photosensitive devices; not all of said photosensitive devices are the same size; and said current mirror means scales the signal applied to said output circuits in accordance with the relative sizes of said monitor device and said photosensitive devices.
Claim 8
Dependent Claim
14 words
The photodetector system recited in claim 6 wherein: said quiescent signal is a current.
Claim 9
Dependent Claim
50 words
The photodetector system recited in claim 1 further comprising: a second monitor device coupled to said current mirror means in a manner to combine the condition-dependent quiescent output signals derived from the first recited and said second monitor devices to more accurately compensate said photosensitive devices of said photodetector system.
Claim 10
Dependent Claim
47 words
The photodetector system recited in claim 8 wherein: said photosensitive devices are arranged in a linear array extending in a first direction and said monitor devices are disposed on opposite sides of said linear array in a second direction disposed at an angle to said first direction.
Claim 11
Dependent Claim
41 words
The photodetector system recited in claim 8 wherein: said photosensitive devices are arranged in a linear array extending in a first direction and said monitor devices are spaced apart and disposed in the vicinity of opposite ends of said linear array.
Claim 12
Dependent Claim
31 words
The photodetector system recited in claim 10 said monitor devices are disposed on opposite sides of said linear array in a second direction disposed at an angle to said first direction.
Claim 13
Dependent Claim
133 words
A photodetector system comprising: a photosensitive device which exhibits a condition-dependent quiescent output signal; an output circuit connected to receive the output signal from said photosensitive device; a quiescent output signal monitor device having a condition-dependent-quiescent-output-signal response which is proportional to that of said photosensitive device; means for shielding said monitor device from the light to be sensed by said photosensitive device, whereby the output signal from said monitor device is proportional to the condition-dependent-quiescent-output-signal contribution to the output signal from said photosensitive device; current mirror means responsive to said monitor device for applying a condition-dependent-quiescent-output-signal-compensating signal to said output circuit to compensate for the condition-dependent quiescent output signal from said photosensitive device whereby the output from said output circuit is substantially independent of the condition-dependent quiescent output signal of said photosensitive device.
Claim 14
Dependent Claim
133 words
A photodetector system comprising: a photosensitive device which exhibits a condition-dependent quiescent output signal; an output circuit connected to receive the output signal from said photosensitive device; a quiescent output signal monitor device having a condition-dependent-quiescent-output-signal response which is proportional to that of said photosensitive device; means for shielding said monitor device from the light to be sensed by said photosensitive device, whereby the output signal from said monitor device is proportional to the condition-dependent-quiescent-output-signal contribution to the output signal from said photosensitive device; current mirror means responsive to said monitor device for applying a condition-dependent-quiescent-output-signal-compensating signal to said output circuit to compensate for the condition-dependent quiescent output signal from said photosensitive device whereby the output from said output circuit is substantially independent of the condition-dependent quiescent output signal of said photosensitive device.
Claim 15
Dependent Claim
134 words
A photodetector system comprising: a continuous output photosensitive device which exhibits a condition-dependent quiescent current; an output circuit connected to receive the output current from said photosensitive device; a quiescent current monitor device having a condition-dependent quiescent current response which is proportional to that of said photosensitive device; means for shielding said monitor device from the light to be sensed by said photosensitive device, whereby the output of said monitor device is proportional to the condition-dependent quiescent current contribution to the output signal from said photosensitive device; current mirror means responsive to said monitor device for applying a condition-dependent-quiescent-current-compensating signal to said output circuit to compensate for the condition-dependent quiescent current from said photosensitive device whereby the output from said output circuit is substantially independent of the condition-dependent quiescent current of said photosensitive device.
Claim 16
Dependent Claim
134 words
A photodetector system comprising: a continuous output photosensitive device which exhibits a condition-dependent quiescent current; an output circuit connected to receive the output current from said photosensitive device; a quiescent current monitor device having a condition-dependent quiescent current response which is proportional to that of said photosensitive device; means for shielding said monitor device from the light to be sensed by said photosensitive device, whereby the output of said monitor device is proportional to the condition-dependent quiescent current contribution to the output signal from said photosensitive device; current mirror means responsive to said monitor device for applying a condition-dependent-quiescent-current-compensating signal to said output circuit to compensate for the condition-dependent quiescent current from said photosensitive device whereby the output from said output circuit is substantially independent of the condition-dependent quiescent current of said photosensitive device.
Claim 17
Dependent Claim
161 words
A photodetector system comprising: a plurality of continuous output photosensitive devices which exhibit condition-dependent quiescent output signals; a plurality of output circuits each connected to receive the output signal from a different one of said photosensitive devices; a quiescent output signal monitor device having a condition-dependent quiescent output which is proportional to that of said photosensitive devices; means for shielding said monitor device from the light to be sensed by said photosensitive devices, whereby the output signal from said monitor device is proportional to the condition-dependent-quiescent-output-signal contributions to the output signals from said photosensitive devices; and current mirror means responsive to the output signal from said monitor device for applying condition-dependent-quiescent-output-signal-compensating signals to a plurality of said output circuits to compensate for the condition-dependent quiescent output from each of said photosensitive devices, whereby the output from each of said output circuits is substantially independent of the condition-dependent quiescent output of the one of said photosensitive devices to which it is coupled.
Claim 18
Dependent Claim
161 words
A photodetector system comprising: a plurality of continuous output photosensitive devices which exhibit condition-dependent quiescent output signals; a plurality of output circuits each connected to receive the output signal from a different one of said photosensitive devices; a quiescent output signal monitor device having a condition-dependent quiescent output which is proportional to that of said photosensitive devices; means for shielding said monitor device from the light to be sensed by said photosensitive devices, whereby the output signal from said monitor device is proportional to the condition-dependent-quiescent-output-signal contributions to the output signals from said photosensitive devices; and current mirror means responsive to the output signal from said monitor device for applying condition-dependent-quiescent-output-signal-compensating signals to a plurality of said output circuits to compensate for the condition-dependent quiescent output from each of said photosensitive devices, whereby the output from each of said output circuits is substantially independent of the condition-dependent quiescent output of the one of said photosensitive devices to which it is coupled.
Claim 19
Dependent Claim
15 words
The photodetector system recited in claim 14 wherein: said quiescent output signal is a current.
Claim 20
Dependent Claim
50 words
The photodetector system recited in claim 15 wherein: said monitor device is a different size than at least some of said photosensitive devices; and said current mirror means scales the signal applied to said output circuits in accordance with the relative sizes of said monitor device and said photosensitive devices.
Claim 21
Dependent Claim
49 words
The photodetector system recited in claim 15 further comprising: a second monitor device coupled to said current mirror means in a manner to combine the condition-dependent quiescent currents derived from the first recited and said second monitor devices to more accurately compensate said photosensitive devices of said photodetector system.
Claim 22
Dependent Claim
47 words
The photodetector system recited in claim 17 wherein: said photosensitive devices are arranged in a linear array extending in a first direction and said monitor devices are disposed on opposite sides of said linear array in a second direction disposed at an angle to said first direction.
Claim 23
Dependent Claim
41 words
The photodetector system recited in claim 17 wherein: said photosensitive devices are arranged in a linear array extending in a first direction and said monitor devices are spaced apart and disposed in the vicinity of opposite ends of said linear array.
Claim 24
Dependent Claim
32 words
The photodetector system recited in claim 19 wherein: said monitor devices are disposed on opposite sides of said linear array in a second direction disposed at an angle to said first direction.
Claim 25
Dependent Claim
132 words
A photodetector system comprising: a continuous output photosensitive device which exhibits a condition-dependent quiescent current; an output circuit connected to receive the output current from said photosensitive device; a condition-dependent quiescent current monitor device having a condition-dependent-quiescent-current response which is proportional to that of said photosensitive device; means for shielding said monitor device from the light to be sensed by said photosensitive device, whereby the output of said monitor device is proportional to the condition-dependent-quiescent-current contribution to the output signal from said photosensitive device; current mirror means responsive to said monitor device for applying a condition-dependent-quiescent-current-signal compensating signal to said output circuit to compensate for the condition-dependent quiescent current from said photosensitive device whereby the output from said output circuit is substantially independent of the condition-dependent quiescent current of said photosensitive device.
Claim 26
Dependent Claim
132 words
A photodetector system comprising: a continuous output photosensitive device which exhibits a condition-dependent quiescent current; an output circuit connected to receive the output current from said photosensitive device; a condition-dependent quiescent current monitor device having a condition-dependent-quiescent-current response which is proportional to that of said photosensitive device; means for shielding said monitor device from the light to be sensed by said photosensitive device, whereby the output of said monitor device is proportional to the condition-dependent-quiescent-current contribution to the output signal from said photosensitive device; current mirror means responsive to said monitor device for applying a condition-dependent-quiescent-current-signal compensating signal to said output circuit to compensate for the condition-dependent quiescent current from said photosensitive device whereby the output from said output circuit is substantially independent of the condition-dependent quiescent current of said photosensitive device.
Claim 27
Dependent Claim
102 words
A current mirror comprising: an input section including a monitor device and an input control device connected to in a manner in which a reference output signal from said monitor device biases said input control device to provide said output signal; a plurality of output sections each including: an output control device, and a compensated device connected to said output control device in a manner corresponding to the connection of said monitor device to said input control device; said monitor and compensated devices having corresponding characteristics whereby, said current mirror conducts the reference portions of the output signals of said compensated devices.
Claim 28
Dependent Claim
102 words
A current mirror comprising: an input section including a monitor device and an input control device connected to in a manner in which a reference output signal from said monitor device biases said input control device to provide said output signal; a plurality of output sections each including: an output control device, and a compensated device connected to said output control device in a manner corresponding to the connection of said monitor device to said input control device; said monitor and compensated devices having corresponding characteristics whereby, said current mirror conducts the reference portions of the output signals of said compensated devices.
Claim 29
Dependent Claim
44 words
The current mirror recited in claim 22 wherein: said monitor device reference output signal is a condition-dependent quiescent output signal whereby said current mirror compensates the output circuits of said compensated devices for the condition-dependent-quiescent-output-signal portions of the output signals of said compensated devices.
Claim 30
Dependent Claim
15 words
The current mirror recited in claim 23 wherein: said compensated devices are continuous output devices.
Claim 31
Dependent Claim
14 words
The current mirror recited in claim 24 wherein: said quiescent signal is a current.
Claim 32
Dependent Claim
50 words
The current mirror recited in claim 22 wherein: said monitor device is a different size than at least some of said compensated devices; and said current mirror means scales the signal applied to said output circuits in accordance with the relative sizes of said monitor device and said compensated devices.
Claim 33
Dependent Claim
14 words
The current mirror recited in claim 26 wherein: said quiescent signal is a current.
Claim 34
Dependent Claim
60 words
The current mirror recited in claim 22 wherein: said monitor device is a different size than at least some of said compensated devices; not all of said compensated devices are the same size; and said current mirror means scales the signal applied to said output circuits in accordance with the relative sizes of said monitor device and said compensated devices.
Claim 35
Dependent Claim
14 words
The current mirror recited in claim 28 wherein: said quiescent signal is a current.
Claim 36
Dependent Claim
46 words
The current mirror recited in claim 22 further comprising: a second monitor device coupled to said current mirror means in a manner to combine the condition-dependent quiescent output signals derived from the first recited and said second monitor devices to more accurately compensate said compensated devices.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |