US3922585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feedback amplifier circuit
Assignee: Tektronix Inc
•
Filing: 1974-01-17
•
Granted: 1975-11-25
•
Expires: 1994-01-17
Abstract
Abstract A feedback amplifier circuit includes a pair of push-pull amplifiers adapted for driving the deflection plates of a cathode ray tube, with each amplifier being provided with a negative feedback circuit including an active amplifying device. As a result of the employment of an amplifying device in each feedback circuit, the conductive loading of output stages is reduced, and therefore the standing current which must be supplied to the amplifier circuit is also reduced.
Inventors
- 👤 Roland E Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:31
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3066; H03F1/00; H03F1/30; H03F1/302; H03F1/34; H03F3/26; H03F3/3081; H03K; H03K6/00; H03K6/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
166 words
A feedback amplifier circuit including at least a first amplifying means having an input and an output and exhibiting an open loop gain at said output as compared with said input, said first amplifying means comprising a first common emitter transistor stage driving a second common base transistor stage with the latter providing said output of said first amplifying means and of said amplifier circuit, and negative feedback means coupling said output to said input of said first amplifying means over a range of frequencies at which said first amplifying means operates, said feedback means including a second amplifying means having an input and an output, wherein the input of the second amplifying means is coupled to receive the output of the first amplifying means and impedance means coupling the output of said second amplifying means to the input of the first amplifying means, said second amplifying means comprising an emitterfollower transistor stage coupled from the output of said first amplifying means to said impedance means.
Claim 2
Dependent Claim
166 words
A feedback amplifier circuit including at least a first amplifying means having an input and an output and exhibiting an open loop gain at said output as compared with said input, said first amplifying means comprising a first common emitter transistor stage driving a second common base transistor stage with the latter providing said output of said first amplifying means and of said amplifier circuit, and negative feedback means coupling said output to said input of said first amplifying means over a range of frequencies at which said first amplifying means operates, said feedback means including a second amplifying means having an input and an output, wherein the input of the second amplifying means is coupled to receive the output of the first amplifying means and impedance means coupling the output of said second amplifying means to the input of the first amplifying means, said second amplifying means comprising an emitterfollower transistor stage coupled from the output of said first amplifying means to said impedance means.
Claim 3
Dependent Claim
53 words
The amplifier circuit according to claim 1 wherein said emitter-follower stage is coupled to said common base transistor stage by means of a voltage divider connected at one end thereof to the output of the first amplifying means and provided with a tap thereon connected to the base terminal of said emitter-follower stage.
Claim 4
Dependent Claim
46 words
The circuit according to claim 1 further including a current source for said first amplifying means, said current source comprising a fourth transistor having its emitter coupled to a source of voltage and its collector coupled to the collector terminal of said common base transistor stage.
Claim 5
Dependent Claim
32 words
The circuit according to claim 3 further including a capacitor coupling the emitter of said common emitter transistor stage to the emitter of said fourth transistor for also driving said fourth transistor.
Claim 6
Dependent Claim
56 words
The circuit according to claim 4 adapted to drive a deflection plate of a cathode ray tube and further including a substantially similar circuit driving an opposite deflection plate of the cathode ray tube, said substantially similar circuit differing in the polarity of input signal provided thereto and in the conductivity type of said common-emitter stage.
Claim 7
Dependent Claim
66 words
The circuit according to claim 4 further including an additional common base transistor stage interposed in coupling relation between the collector of said common emitter transistor stage and the emitter of said first mentioned common base transistor stage, said circuit further including an a.c. coupling capacitor between the collector of said common emitter transistor stage and the emitter of said first mentioned common base transistor stage.
Claim 8
Dependent Claim
39 words
The circuit according to claim 1 wherein said first amplifying means is biased to a low current state and is adapted to receive inputs of a given relative polarity for causing said first amplifying means to draw increased current.
Claim 9
Dependent Claim
154 words
A feedback amplifier circuit for driving first and second deflection plates of a cathode ray tube, said circuit comprising: a first feedback amplifier for driving a first deflection plate of said cathode ray tube, said first amplifier receiving a current input ramp and providing in response thereto a voltage output ramp at said first deflection plate, said first amplifier having a feedback circuit including active amplifying means for coupling a negative feedback signal from the output to the input of said first amplifier, a second feedback amplifier receiving the current ramp input and providing a voltage ramp output for driving said second deflection plate in substantially push-pull relation with the first deflection plate, said second amplifier having a feedback circuit including an active amplifying means coupling a negative feedback signal from the output to the input of said second amplifier, and means intercoupling said first and second amplifiers for transient exchange of currents therebetween.
Claim 10
Dependent Claim
154 words
A feedback amplifier circuit for driving first and second deflection plates of a cathode ray tube, said circuit comprising: a first feedback amplifier for driving a first deflection plate of said cathode ray tube, said first amplifier receiving a current input ramp and providing in response thereto a voltage output ramp at said first deflection plate, said first amplifier having a feedback circuit including active amplifying means for coupling a negative feedback signal from the output to the input of said first amplifier, a second feedback amplifier receiving the current ramp input and providing a voltage ramp output for driving said second deflection plate in substantially push-pull relation with the first deflection plate, said second amplifier having a feedback circuit including an active amplifying means coupling a negative feedback signal from the output to the input of said second amplifier, and means intercoupling said first and second amplifiers for transient exchange of currents therebetween.
Claim 11
Dependent Claim
23 words
The circuit according to claim 8 wherein first stages of said first and second feedback amplifiers are provided with a common current return.
Claim 12
Dependent Claim
28 words
The circuit according to claim 8 wherein said active amplifying means in the feedback circuits of said first and second amplifiers are provided with a common current supply.
Claim 13
Dependent Claim
40 words
The circuit according to claim 8 wherein each of said amplifiers comprises a common emitter transistor stage driving a common base transistor output stage, and wherein said active amplifying means in the feedback circuit comprises an emitter follower transistor stage.
Claim 14
Dependent Claim
43 words
The circuit according to claim 8 wherein the first stage in each amplifier is in each case biased to a low current state and is adapted to receive one of a pair of push-pull inputs for causing the amplifier to draw increased current.
Claim 15
Dependent Claim
80 words
A feedback amplifier circuit comprising: first transistor means having an input and an output, second plural transistor means having an input and an output and including common collector means therebetween, said output of said first transistor means being connected to said input of said second transistor means defining emitter means thereof, negative feedback means connected from said output of said second transistor means to said input of said first transistor means, and impedance means included in said negative feedback means.
Claim 16
Dependent Claim
80 words
A feedback amplifier circuit comprising: first transistor means having an input and an output, second plural transistor means having an input and an output and including common collector means therebetween, said output of said first transistor means being connected to said input of said second transistor means defining emitter means thereof, negative feedback means connected from said output of said second transistor means to said input of said first transistor means, and impedance means included in said negative feedback means.
References Cited (Backward Citations)
US3488551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |