Patent US3631356A successfully refreshed from Google Patents.
US3631356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controllable amplifier stage
Assignee: Individual
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Filing: 1969-12-16
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Granted: 1971-12-28
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Expires: 1989-12-16
Abstract
Abstract An integrated signal-controlled amplifier stage uses a differential amplifier emitter coupled to a signal input amplifying transistor connected in the grounded emitter configuration. In order to provide DC stabilization of the output transistor in the differential amplifier a first resistor is connected between a source of constant potential and the output collector of the differential amplifier to provide direct current to the output transistor and, through a second resistor connecting the collectors of the differential amplifier, to the control voltage transistor of the differential amplifier. In addition, a capacitor is connected between the collector of the control voltage transistor and ground.
Inventors
- 👤 Wilfried Aschermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:02
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/343; H03F3/347; H03F3/45; H03F3/45071; H03G; H03G1/00; H03G1/0005; H03G1/0017; H03G1/0023
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
173 words
A voltage-controllable amplifier stage, comprising a first transistor having a collector, an emitter and a base, a second transistor having a collector, an emitter and a base, the first and second transistors comprising a differential amplifier, a current source means connected to the emitters of both the first and second transistors for providing a signal alternating about a constant current, means for connecting the base of the second transistor to a control voltage, means for connecting the base of the first transistor to a fixed potential, a first impedance means connecting the collectors of the first and the second transistors, a second impedance means connecting the collector of the first transistor to a source of constant potential for conducting substantially all the direct current flowing through the first and the second transistors, a third impedance means connecting the collector of the second transistor to ground potential for diverting alternating current appearing at the collector of the second transistor to ground, the collector of the first transistor comprising the output of the amplifier stage.
Claim 2
Dependent Claim
173 words
A voltage-controllable amplifier stage, comprising a first transistor having a collector, an emitter and a base, a second transistor having a collector, an emitter and a base, the first and second transistors comprising a differential amplifier, a current source means connected to the emitters of both the first and second transistors for providing a signal alternating about a constant current, means for connecting the base of the second transistor to a control voltage, means for connecting the base of the first transistor to a fixed potential, a first impedance means connecting the collectors of the first and the second transistors, a second impedance means connecting the collector of the first transistor to a source of constant potential for conducting substantially all the direct current flowing through the first and the second transistors, a third impedance means connecting the collector of the second transistor to ground potential for diverting alternating current appearing at the collector of the second transistor to ground, the collector of the first transistor comprising the output of the amplifier stage.
Claim 3
Dependent Claim
17 words
A controlled amplifier stage as claimed in claim 1, wherein the third impedance means comprises a capacitor.
Claim 4
Dependent Claim
16 words
An amplifier stage as claimed in claim 1, wherein the first impedance means comprises a resistor.
Claim 5
Dependent Claim
25 words
An amplifier stage as claimed in claim 2, wherein the first impedance means comprises a resistor, and whereiN the second impedance means comprises a resistor.
Claim 6
Dependent Claim
44 words
An amplifier stage as claimed in claim 4, wherein the sum of the resistors comprising the first and second impedances is greater than the impedance of the capacitor comprising the third resistance by at least twice the control factor at the lowest signal frequency.
Claim 7
Dependent Claim
22 words
A controllable amplifier stage as claimed in claim 4, wherein an additional resistor (17) is connected in series with the capacitor (14).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |