US6064278A
Expired / Lapsed
US
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Structure of pulse-width modulator
Assignee: Denso Corp
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Filing: 1998-10-28
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Granted: 2000-05-16
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Expires: 2018-10-28
Abstract
Abstract A compact structure of a pulse-width modulator is provided which includes a clock generator, a counter, a D/A converter, a comparator, and a latching circuit. The clock generator generates clock signals. The counter counts the clock signals and provides a count signal indicative thereof in a digital form. The D/A converter converts the count signal into an analog signal. The comparator compares the analog signal converted by said D/A converter with an input signal to be pulse-width modulated to provide an output indicative thereof. The latching circuit latches the output of the comparator in response to a latch signal shifted from a change in level of the count signal to provide a pulse-width modulated signal.
Inventors
- 👤 Yukihiko Tanizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:12
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/02; G01L9/06; H; H03; H03K; H03K7/00; H03K7/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
A pulse-width modulator comprising: a clock generator generating clock signals; a counter counting the clock signals outputted from said clock generator to provide a count signal indicative thereof in a digital form; a D/A converter converting the count signal provided by said counter into an analog signal; a comparator comparing the analog signal converted by said D/A converter with an input signal to be pulse-width modulated to provide an output indicative thereof; and a latching circuit latching the output of said comparator in response to a latch signal shifted from a change in level of the count signal outputted from said counter to provide a pulse-width modulated signal.
Claim 2
Dependent Claim
108 words
A pulse-width modulator comprising: a clock generator generating clock signals; a counter counting the clock signals outputted from said clock generator to provide a count signal indicative thereof in a digital form; a D/A converter converting the count signal provided by said counter into an analog signal; a comparator comparing the analog signal converted by said D/A converter with an input signal to be pulse-width modulated to provide an output indicative thereof; and a latching circuit latching the output of said comparator in response to a latch signal shifted from a change in level of the count signal outputted from said counter to provide a pulse-width modulated signal.
Claim 3
Dependent Claim
36 words
A pulse-width modulator as set forth in claim 1, wherein said clock generator includes an oscillator outputting an oscillating signal and a circuit outputting the clock signals and the latch signal based on the oscillating signal.
Claim 4
Dependent Claim
46 words
A pulse-width modulator as set forth in claim 2, wherein said latching circuit includes a flip-flop with a synchronous input which is set by a signal inputted in a given cycle and reset by latching the output of said comparator in response to the latch signal.
Claim 5
Dependent Claim
123 words
A sensing device comprising: a sensing circuit sensing a given parameter to output a sensor signal indicative thereof; a clock generator generating clock signals; a counter counting the clock signals outputted from said clock generator to provide a count signal indicative thereof in a digital form; a D/A converter converting the count signal provided by said counter into an analog signal; a comparator comparing the analog signal converted by said D/A converter with the sensor signal outputted from said sensing circuit to provide an output indicative thereof; and a latching circuit latching the output of said comparator in response to a latch signal shifted from a change in level of the count signal outputted from said counter to provide a pulse-width modulated signal.
Claim 6
Dependent Claim
123 words
A sensing device comprising: a sensing circuit sensing a given parameter to output a sensor signal indicative thereof; a clock generator generating clock signals; a counter counting the clock signals outputted from said clock generator to provide a count signal indicative thereof in a digital form; a D/A converter converting the count signal provided by said counter into an analog signal; a comparator comparing the analog signal converted by said D/A converter with the sensor signal outputted from said sensing circuit to provide an output indicative thereof; and a latching circuit latching the output of said comparator in response to a latch signal shifted from a change in level of the count signal outputted from said counter to provide a pulse-width modulated signal.
Claim 7
Dependent Claim
32 words
A sensing device as set forth in claim 4, wherein said sensing circuit, said clock generator, said counter, said D/A converter, said comparator, and said latching circuit are integrated into one chip.
Claim 8
Dependent Claim
51 words
A sensing device as set forth in claim 4, further comprising a circuit which adjusts a pulse width of the pulse width-modulated signal outputted from said latching circuit to be within a range of a minimum and a maximum value corresponding to a given range within which the sensor signal changes.
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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) | 2003-05-16 | 2003-11-15 | 2004-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-16 | 2007-11-15 | 2008-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-16 | 2011-11-15 | 2012-05-16 | $7700.00 | Window Closed / Lapsed |