US4486718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High gain transistor amplifier producing an output free from noise carried on the power voltage
Assignee: NEC Corp
•
Filing: 1982-03-19
•
Granted: 1984-12-04
•
Expires: 2002-03-19
Abstract
Abstract The present invention provides an amplifier having cascade-connected first and second transistors, a constant current source for supplying an operating current to the first transistor, and a load resistor connected to the collector of the first transistor at one end and to a substantially constant voltage terminal at the other end. The amplifier arrangement of the invention removes the necessity of a large capacitance capacitor for noise suppression.
Inventors
- 👤 Mitsutoshi Sugawara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:12
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/26; H03F1/30; H03F1/302
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
227 words
A transistor amplifier comprising: a power supply terminal for receiving a power source voltage; a reference potential terminal for receiving a fixed reference potential. an input terminal for receiving an input signal; a first transistor having an emitter coupled to said reference potential terminal, a base coupled to said input terminal, and a collector; a first constant current source connected between said collector of said first transistor and said power supply terminal, said first constant current source supplying an operating current to said first transistor; a first load having one end connected to said collector of said first transistor; a second constant current source connected between the other end of said first load and said power supply terminal; a series circuit of a predetermined number of forward biased diodes, said series circuit being connected between said other end of said first load and said reference potential terminal; a second transistor having a base coupled to said collector of said first transistor, an emitter coupled to said reference potential terminal through a first resistor, and a collector; an output terminal coupled to said collector of said second transistor; a second load connected between said collector of said second transistor and said power supply terminal; and a D.C. feedback means for feeding back the signal at said emitter of said second transistor to said base of said first transistor.
Claim 2
Dependent Claim
227 words
A transistor amplifier comprising: a power supply terminal for receiving a power source voltage; a reference potential terminal for receiving a fixed reference potential. an input terminal for receiving an input signal; a first transistor having an emitter coupled to said reference potential terminal, a base coupled to said input terminal, and a collector; a first constant current source connected between said collector of said first transistor and said power supply terminal, said first constant current source supplying an operating current to said first transistor; a first load having one end connected to said collector of said first transistor; a second constant current source connected between the other end of said first load and said power supply terminal; a series circuit of a predetermined number of forward biased diodes, said series circuit being connected between said other end of said first load and said reference potential terminal; a second transistor having a base coupled to said collector of said first transistor, an emitter coupled to said reference potential terminal through a first resistor, and a collector; an output terminal coupled to said collector of said second transistor; a second load connected between said collector of said second transistor and said power supply terminal; and a D.C. feedback means for feeding back the signal at said emitter of said second transistor to said base of said first transistor.
Claim 3
Dependent Claim
18 words
A transistor amplifier as claimed in claim 1, wherein said predetermined number of forward biased diodes is two.
Claim 4
Dependent Claim
20 words
A transistor amplifier as claimed in claim 1, wherein said predetermined number of forward biased diodes is more than two.
Claim 5
Dependent Claim
173 words
A high-gain transistor amplifier comprising: an input terminal for receiving an input signal; a reference voltage terminal; a power source terminal for receiving a power supply voltage; a first transistor for amplifying said input signal, said first transistor having a common electrode coupled to said reference voltage terminal, an input electrode coupled to said input terminal and an output electrode; a second transistor having an input electrode connected to said output electrode of said first transistor, a common electrode and an output electrode; a constant current source inserted between said power source terminal and said output electrode of said first transistor, said constant current source supplying an operating current to said first transistor; a constant voltage source coupled to said power source terminal and having a constant voltage terminal maintained at substantially the same voltage as the voltage at said output electrode of said first transistor; a load connected between said output electrode of said first transistor and said constant voltage terminal; and means for providing an output signal from said second transistor.
Claim 6
Dependent Claim
173 words
A high-gain transistor amplifier comprising: an input terminal for receiving an input signal; a reference voltage terminal; a power source terminal for receiving a power supply voltage; a first transistor for amplifying said input signal, said first transistor having a common electrode coupled to said reference voltage terminal, an input electrode coupled to said input terminal and an output electrode; a second transistor having an input electrode connected to said output electrode of said first transistor, a common electrode and an output electrode; a constant current source inserted between said power source terminal and said output electrode of said first transistor, said constant current source supplying an operating current to said first transistor; a constant voltage source coupled to said power source terminal and having a constant voltage terminal maintained at substantially the same voltage as the voltage at said output electrode of said first transistor; a load connected between said output electrode of said first transistor and said constant voltage terminal; and means for providing an output signal from said second transistor.
Claim 7
Dependent Claim
185 words
A high-gain transistor amplifier comprising: an input terminal for receiving an input signal; a reference voltage terminal; a power source terminal for receiving a power supply voltage; a first transistor for amplifying said input signal, said first transistor having a common electrode coupled to said reference voltage terminal, an input electrode coupled to said input terminal and an output electrode; a second transistor having an input electrode connected to said output electrode of said first transistor, a common electrode and an output electrode; a constant current source inserted between said power source terminal and said output electrode of said first transistor, said constant current source supplying an operating current to said first transistor; a constant voltage source coupled to said power source terminal and having a constant voltage terminal maintained at a substantially constant voltage; a load connected between said output electrode of said first transistor and said constant voltage terminal; means for providing an output signal from said second transistor; and feedback means for feeding a DC voltage at a common electrode of said second transistor to an input electrode of said first transistor.
Claim 8
Dependent Claim
185 words
A high-gain transistor amplifier comprising: an input terminal for receiving an input signal; a reference voltage terminal; a power source terminal for receiving a power supply voltage; a first transistor for amplifying said input signal, said first transistor having a common electrode coupled to said reference voltage terminal, an input electrode coupled to said input terminal and an output electrode; a second transistor having an input electrode connected to said output electrode of said first transistor, a common electrode and an output electrode; a constant current source inserted between said power source terminal and said output electrode of said first transistor, said constant current source supplying an operating current to said first transistor; a constant voltage source coupled to said power source terminal and having a constant voltage terminal maintained at a substantially constant voltage; a load connected between said output electrode of said first transistor and said constant voltage terminal; means for providing an output signal from said second transistor; and feedback means for feeding a DC voltage at a common electrode of said second transistor to an input electrode of said first transistor.
Claim 9
Dependent Claim
168 words
A high-gain transistor amplifier comprising: an input terminal for receiving an input signal; a reference voltage terminal; a power source terminal for receiving a power supply voltage; a first transistor for amplifying said input signal, said first transistor having a common electrode coupled to said reference voltage terminal, an input electrode coupled to said input terminal and an output electrode; a second transistor having an input electrode connected to said output electrode of said first transistor, a common electrode and an output electrode; a constant current source inserted between said power source terminal and said output electrode of said first transistor, said constant current source supplying an operating current to said first transistor; a constant voltage generator for supplying a substantially constant voltage to a constant voltage terminal, said constant voltage generator including at least two forward-biased diodes connected in series; a load connected between said output electrode of said first transistor and said constant voltage terminal; and means for providing an output signal from said second transistor.
Claim 10
Dependent Claim
168 words
A high-gain transistor amplifier comprising: an input terminal for receiving an input signal; a reference voltage terminal; a power source terminal for receiving a power supply voltage; a first transistor for amplifying said input signal, said first transistor having a common electrode coupled to said reference voltage terminal, an input electrode coupled to said input terminal and an output electrode; a second transistor having an input electrode connected to said output electrode of said first transistor, a common electrode and an output electrode; a constant current source inserted between said power source terminal and said output electrode of said first transistor, said constant current source supplying an operating current to said first transistor; a constant voltage generator for supplying a substantially constant voltage to a constant voltage terminal, said constant voltage generator including at least two forward-biased diodes connected in series; a load connected between said output electrode of said first transistor and said constant voltage terminal; and means for providing an output signal from said second transistor.
Claim 11
Dependent Claim
201 words
A high-gain transistor amplifier comprising: an input terminal for receiving an input signal; a reference voltage terminal; a power source terminal for receiving a power supply voltage; a first transistor for amplifying said input signal, said first transistor having a common electrode coupled to said reference voltage terminal, an input electrode coupled to said input terminal and an output electrode; a second transistor having an input electrode connected to said output electrode of said first transistor, a common electrode and an output electrode; a constant current source inserted between said power source terminal and said output electrode of said first transistor, said constant current source supplying an operating current to said first transistor; a constant voltage generator for supplying a substantially constant voltage to a constant voltage terminal, said constant voltage generator including more than three forward-biased diodes connected in series and a third transistor having an emitter connected to said constant voltage terminal, a voltage obtained from said series connection of said forward-biased diodes being applied to a base of said third transistor, a load connected between said output electrode of said first transistor and said constant voltage terminal; and means for providing an output signal from said second transistor.
Claim 12
Dependent Claim
201 words
A high-gain transistor amplifier comprising: an input terminal for receiving an input signal; a reference voltage terminal; a power source terminal for receiving a power supply voltage; a first transistor for amplifying said input signal, said first transistor having a common electrode coupled to said reference voltage terminal, an input electrode coupled to said input terminal and an output electrode; a second transistor having an input electrode connected to said output electrode of said first transistor, a common electrode and an output electrode; a constant current source inserted between said power source terminal and said output electrode of said first transistor, said constant current source supplying an operating current to said first transistor; a constant voltage generator for supplying a substantially constant voltage to a constant voltage terminal, said constant voltage generator including more than three forward-biased diodes connected in series and a third transistor having an emitter connected to said constant voltage terminal, a voltage obtained from said series connection of said forward-biased diodes being applied to a base of said third transistor, a load connected between said output electrode of said first transistor and said constant voltage terminal; and means for providing an output signal from said second transistor.
Claim 13
Dependent Claim
124 words
A high-gain amplifier comprising: an input terminal; an output terminal; a power supply line; a reference potential terminal; a first amplifying section having a first input connected to said input terminal, a first output, and a first load having one end connected to said first output; a second amplifying section having a second input connected to said first output, a second output, and a second load inserted between said second output and said power supply line; a constant current source inserted between said first output and said power supply; and means for applying a substantially constant voltage to the other end of said first load, said applying means including an emitter-follower transistor having an emitter connected to said other end of said first load.
Claim 14
Dependent Claim
124 words
A high-gain amplifier comprising: an input terminal; an output terminal; a power supply line; a reference potential terminal; a first amplifying section having a first input connected to said input terminal, a first output, and a first load having one end connected to said first output; a second amplifying section having a second input connected to said first output, a second output, and a second load inserted between said second output and said power supply line; a constant current source inserted between said first output and said power supply; and means for applying a substantially constant voltage to the other end of said first load, said applying means including an emitter-follower transistor having an emitter connected to said other end of said first load.
Claim 15
Dependent Claim
126 words
A high-gain amplifier comprising: an input terminal; an output terminal; a power supply line; a reference potential terminal; a first amplifying section having a first input connected to said input terminal, a first output, and a first load having one end connected to said first output; a second amplifying section having a second input connected to said first output, a second output, and a second load inserted between said second output and said power supply line; a constant current source inserted between said first output and said power supply; means for applying a substantially constant voltage to the other end of said first load; and feedback means for supplying a DC voltage from said second amplifying section to said first input of said first amplifying section.
Claim 16
Dependent Claim
126 words
A high-gain amplifier comprising: an input terminal; an output terminal; a power supply line; a reference potential terminal; a first amplifying section having a first input connected to said input terminal, a first output, and a first load having one end connected to said first output; a second amplifying section having a second input connected to said first output, a second output, and a second load inserted between said second output and said power supply line; a constant current source inserted between said first output and said power supply; means for applying a substantially constant voltage to the other end of said first load; and feedback means for supplying a DC voltage from said second amplifying section to said first input of said first amplifying section.
References Cited (Backward Citations)
DE1816148A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |