Patent US4510459A successfully refreshed from Google Patents.
US4510459A
Expired / Lapsed
US
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Wideband record amplifier
Assignee: Sony Corp
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Filing: 1982-11-10
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Granted: 1985-04-09
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Expires: 2002-11-10
Abstract
Abstract A wideband recording amplifier having push-pull amplification stages in which each stage comprises a common-base configured transistor amplifier driving an emitter-follower configured amplifier and with a negative feedback signal being applied to the base inputs of the common-base configured amplifiers.
Inventors
- 👤 Barrett E. Guisinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:16
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/42; H03F1/48; H03F3/00; H03F3/181; H03F3/183; H03F3/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
A wideband amplifier for driving a load which is primarily inductive in response to an input signal, said amplifier comprising; a circuit ground; a pair of common-base configured transistor amplifier stages operating in push-pull fashion, the transistors being of opposite polarity and each having a separate emitter input for receiving the input signal, a separate base input for receiving a feedback signal and a separate collector output the two collector outputs being directly connected together; a pair of buffer amplifier stages, each having an input coupled to said connected together collector outputs of said common-base configured amplifier stages and an output connected in series with the load to the circuit ground; a feedback resistor connected in series between the load and the circuit ground such that substantially all of the current passing through the load also passes through the feedback resistor; and means for applying the voltage developed across the feedback resistor to the base inputs of the common base configured transistor amplifier stages.
Claim 2
Dependent Claim
164 words
A wideband amplifier for driving a load which is primarily inductive in response to an input signal, said amplifier comprising; a circuit ground; a pair of common-base configured transistor amplifier stages operating in push-pull fashion, the transistors being of opposite polarity and each having a separate emitter input for receiving the input signal, a separate base input for receiving a feedback signal and a separate collector output the two collector outputs being directly connected together; a pair of buffer amplifier stages, each having an input coupled to said connected together collector outputs of said common-base configured amplifier stages and an output connected in series with the load to the circuit ground; a feedback resistor connected in series between the load and the circuit ground such that substantially all of the current passing through the load also passes through the feedback resistor; and means for applying the voltage developed across the feedback resistor to the base inputs of the common base configured transistor amplifier stages.
Claim 3
Dependent Claim
16 words
The amplifier of claim 1 wherein said buffer amplifier stages comprise emitter-follower configured transistor amplifier stages.
Claim 4
Dependent Claim
18 words
The amplifier of claim 2 wherein said buffer amplifier stages include a PNP-type transistor and a NPN-type transistor.
Claim 5
Dependent Claim
43 words
The amplifier of claim 1 further comprising a a pair of emitter-follower configured transistor amplifier stages which are each connected in series between a source of the input signal and a separate one of the emitter inputs of the common-base configured amplifier stages.
Claim 6
Dependent Claim
45 words
A wideband amplifier as recited in claim 1 wherein the means for applying the voltage developed across the feedback resistor to the base inputs comprises a pair of capacitors separately connected between the base inputs and the juncture of the feedback resistor and the load.
References Cited (Backward Citations)
US3745477A
Cited
JPS5363955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |