US4647872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cascode amplifier
Assignee: AUDIO RES CORP
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Filing: 1985-07-25
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Granted: 1987-03-03
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Expires: 2005-07-25
Abstract
Abstract A stabilized Cascode Amplifier Circuit wherein the grid or gate control of the second stage of the cascaded input is provided by feedback of a portion of the output signal voltage. The circuit can be further enhanced by the inclusion of a unity gain follower between the first and third stage of the cascode amplifier circuit.
Inventors
- 👤 William Z. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:15
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/08; H03F1/22; H03F1/24; H03F1/223
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
An electron tube cascode-cascade amplifier comprising: a cascode input stage including a cascode pair comprising first and second electron tubes, said first tube acting as the signal input tube; said input stage including unity gain buffer means fpor connecting the plate of said first tube to the cathode of said second tube through a buffered, unity gain circuit path; a cascaded output stage including an output electron tube connected to be driven by the plate output of said second tube; and means for connecting said input and output stages to an operating bias.
Claim 2
Dependent Claim
93 words
An electron tube cascode-cascade amplifier comprising: a cascode input stage including a cascode pair comprising first and second electron tubes, said first tube acting as the signal input tube; said input stage including unity gain buffer means fpor connecting the plate of said first tube to the cathode of said second tube through a buffered, unity gain circuit path; a cascaded output stage including an output electron tube connected to be driven by the plate output of said second tube; and means for connecting said input and output stages to an operating bias.
Claim 3
Dependent Claim
34 words
The amplifier according to claim 1 further including feedback bias means for connecting the cathode output of said output tube to the grid of said second tube to provide a dynamic operating bias thereto.
Claim 4
Dependent Claim
89 words
A transistorized cascode-cascade amplifier comprising: a cascode input stage including a cascode pair comprising first and second transistors, said first transistor acting as the signal input transistor; said input stage including unity gain buffer means for connecting the output of said first transistor to the input of said second transistor through a buffered, unity gain circuit path; a cascoded output stage including an output transistor connected to be driven by the output of said second transistor; and means for connecting said input and output stages to an operating bias.
Claim 5
Dependent Claim
89 words
A transistorized cascode-cascade amplifier comprising: a cascode input stage including a cascode pair comprising first and second transistors, said first transistor acting as the signal input transistor; said input stage including unity gain buffer means for connecting the output of said first transistor to the input of said second transistor through a buffered, unity gain circuit path; a cascoded output stage including an output transistor connected to be driven by the output of said second transistor; and means for connecting said input and output stages to an operating bias.
Claim 6
Dependent Claim
34 words
The amplifier according to claim 3 further including feedback bias means for connecting the output of said output transistor to the control terminal of said second transistor to provide a dynamic operating bias thereto.
Claim 7
Dependent Claim
81 words
A cascode-cascade amplifier comprising: a cascode input stage including a cascode pair comprising first and second amplifying devices, said first device acting as the signal input device; said input stage including unity gain buffer means for connecting said cascode pair together throgh a buffered, unity gain circuit path; a cascaded output stage including an output amplifying device connected to be driven by the output of said second device; and means for connecting said input and output stages to an operating bias.
Claim 8
Dependent Claim
81 words
A cascode-cascade amplifier comprising: a cascode input stage including a cascode pair comprising first and second amplifying devices, said first device acting as the signal input device; said input stage including unity gain buffer means for connecting said cascode pair together throgh a buffered, unity gain circuit path; a cascaded output stage including an output amplifying device connected to be driven by the output of said second device; and means for connecting said input and output stages to an operating bias.
Claim 9
Dependent Claim
34 words
The amplifier according to claim 5 further including feedback bias means for connecting the output of said output device to the control input of said second device to provide a dynamic operating bias thereto.
Claim 10
Dependent Claim
63 words
A cascode input stage for an amplifier comprising: a cascode input stage including a cascode pair comprising first and second amplifying devices, said first device acting as the signal input device; said input stage including unity gain buffer means for connecting said cascode pair together through a buffered, unity gain circuit path; and means for connecting said input stage to an operating bias.
Claim 11
Dependent Claim
63 words
A cascode input stage for an amplifier comprising: a cascode input stage including a cascode pair comprising first and second amplifying devices, said first device acting as the signal input device; said input stage including unity gain buffer means for connecting said cascode pair together through a buffered, unity gain circuit path; and means for connecting said input stage to an operating bias.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |