US5015968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feedback cascode amplifier
Assignee: Pacific Monolithics Inc
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Filing: 1990-07-27
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Granted: 1991-05-14
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Expires: 2010-07-27
Abstract
Abstract A microwave-frequency feedback amplifier circuit has a cascode amplifier with a first field-effect transistor (FET) having a gate for receiving a signal to be amplified, a source coupled to a reference voltage, and a drain. A second FET has a source coupled to the drain of the first FET, a source coupled to the reference voltage, and a drain. A transformer includes a first inductor with a first terminal coupled to the drain of the second FET and a second terminal for outputting an amplified input signal. A second inductor has a first terminal coupled to the second terminal of the first inductor, and a second terminal coupled to the reference voltage. A feedback circuit couples the drain of the second FET to the gate of the first FET.
Inventors
- 👤 Allen F. Podell
- 👤 Fazal Ali
- 👤 Robert H. Benton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:47
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/342; H03F1/08; H03F1/22; H03F1/226; H03F1/347; H03F1/56; H03F1/565
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
A microwave-frequency feedback cascode amplifier comprising: cascode amplifier means comprising a first field-effect transistor means (FET) having a gate for receiving a signal to be amplified, a source coupled to a reference voltage, and a drain; and a second FET having a source coupled to the drain of the first FET, a gate coupled to the reference voltage, and a drain; first inductance means having a first terminal coupled to the drain of the second FET, a second terminal for outputting an amplified input signal; second inductance means having a first terminal coupled to the second terminal of the first inductance means, and a second terminal coupled to the reference voltage; and feedback means coupling the drain of the second FET to the gate of the first FET means.
Claim 2
Dependent Claim
129 words
A microwave-frequency feedback cascode amplifier comprising: cascode amplifier means comprising a first field-effect transistor means (FET) having a gate for receiving a signal to be amplified, a source coupled to a reference voltage, and a drain; and a second FET having a source coupled to the drain of the first FET, a gate coupled to the reference voltage, and a drain; first inductance means having a first terminal coupled to the drain of the second FET, a second terminal for outputting an amplified input signal; second inductance means having a first terminal coupled to the second terminal of the first inductance means, and a second terminal coupled to the reference voltage; and feedback means coupling the drain of the second FET to the gate of the first FET means.
Claim 3
Dependent Claim
16 words
An amplifier according to claim 1 wherein the first and second inductance means are mutually coupled.
Claim 4
Dependent Claim
24 words
An amplifier according to claim 2 wherein the drain of the second FET is coupled to the feedback means through the first inductance means.
Claim 5
Dependent Claim
19 words
An amplifier according to claim 3 wherein the feedback means comprises first resistor means of greater than 600 ohms.
Claim 6
Dependent Claim
57 words
An amplifier according to claim 4 further comprising first resistance means coupling the second terminal of the second inductance means to the reference voltage, impedance means coupling the gate of the second FET to the reference voltage, and second resistance means coupling the gate of the second FET to the second terminal of the second inductance means.
Claim 7
Dependent Claim
24 words
An amplifier according to claim 1 wherein the drain of the second FET is coupled to the feedback means through the first inductance means.
Claim 8
Dependent Claim
19 words
An amplifier according to claim 1 wherein the feedback means comprises first resistor means of greater than 600 ohms.
Claim 9
Dependent Claim
69 words
An amplifier according to claim 1 wherein both FETs have substantially the same pinch-off voltage and the amplifier further comprises first resistance means coupling the second terminal of the second inductance means to the reference voltage, impedance means coupling the gate of the second FET to the reference voltage, and second resistance means coupling the gate of the second FET to the second terminal of the second inductance means.
Claim 10
Dependent Claim
31 words
An amplifier according to claim 1 wherein the second FET has a higher pinch-off voltage than the first FET, and the gate of the second FET is coupled directly to ground.
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) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |