Patent US4348643A successfully refreshed from Google Patents.
US4348643A
Expired / Lapsed
US
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Constant phase limiter
Assignee: Lockheed Martin Corp
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Filing: 1980-11-05
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Granted: 1982-09-07
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Expires: 2000-11-05
Abstract
Abstract A constant phase limiter is disclosed utilizing cascaded RC coupled amplifiers with complex feedback. In the illustrative embodiment, five NPN transistors connected in a common emitter configuration are cascaded. The first stage is a signal conditioning amplifier for setting the limiting threshold. By harmoniously selecting the operating conditions for each of the other stages, an overall constant phase/limited output characteristic can be achieved for the desired range of input signal.
Inventors
- 👤 W. Richard Tennyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:06
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/189; H03F3/19; H03F3/191; H03F1/00; H03F1/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
382 words
A constant phase limiter comprising: (a) a plurality of substantially identical cascaded transistor stages, each of said stages including a transistor having a base, an emitter, and a collector electrode and having an input circuit between said base and said emitter electrode, and an output circuit between said emitter and said collector electrode; (b) an impedance means having a first end and a second end, said first end being connected to said emitter electrode; (c) a first bias means having a first end and a second end, said first end being connected to said second end of said impedance means; (d) a first bypass means having a first and a second end, said first end being connected to said second end of said impedance means, and having said second end being connected to a reference potential; (e) a second bias means having a first and a second end, said first end being connected to said base electrode and having said second end being connected to said second end of said first bias means; (f) a third bias means having a first and a second end, said first end being connected to said base electrode and having said second end being connected to a reference potential; (g) a loading means having a first and a second end, said first end being connected to said collector electrode and having said second end being connected to a reference potential; (h) a coupling capacitor means having a first and a second end, said first end being connected to said collector electrode and having said second end being a first terminal of the output circuit; (i) a decoupling means having a first and a second end, said first end being connected to said second end of said first bias means and having said second end being connected to a second terminal of the output circuit; (j) a bypass and decoupling means having a first and a second end, said first end being connected to said second end of said first bias means and having said second end being connected to a reference potential; and (k) said impedance means further comprising a feedback resistor and a feedback inductor chosen so as to provide an overall constant phase limited output characteristic for a desired range of input signal levels.
Claim 2
Dependent Claim
382 words
A constant phase limiter comprising: (a) a plurality of substantially identical cascaded transistor stages, each of said stages including a transistor having a base, an emitter, and a collector electrode and having an input circuit between said base and said emitter electrode, and an output circuit between said emitter and said collector electrode; (b) an impedance means having a first end and a second end, said first end being connected to said emitter electrode; (c) a first bias means having a first end and a second end, said first end being connected to said second end of said impedance means; (d) a first bypass means having a first and a second end, said first end being connected to said second end of said impedance means, and having said second end being connected to a reference potential; (e) a second bias means having a first and a second end, said first end being connected to said base electrode and having said second end being connected to said second end of said first bias means; (f) a third bias means having a first and a second end, said first end being connected to said base electrode and having said second end being connected to a reference potential; (g) a loading means having a first and a second end, said first end being connected to said collector electrode and having said second end being connected to a reference potential; (h) a coupling capacitor means having a first and a second end, said first end being connected to said collector electrode and having said second end being a first terminal of the output circuit; (i) a decoupling means having a first and a second end, said first end being connected to said second end of said first bias means and having said second end being connected to a second terminal of the output circuit; (j) a bypass and decoupling means having a first and a second end, said first end being connected to said second end of said first bias means and having said second end being connected to a reference potential; and (k) said impedance means further comprising a feedback resistor and a feedback inductor chosen so as to provide an overall constant phase limited output characteristic for a desired range of input signal levels.
Claim 3
Dependent Claim
30 words
The constant phase limiter described in claim 1 wherein said coupling capacitor means cooperates with said second and third bias means to establish a satisfactory collector to emitter operating voltage.
Claim 4
Dependent Claim
21 words
The constant phase limiter described in claim 1 wherein said first bias means sets a satisfactory emitter current through said transistor.
Claim 5
Dependent Claim
31 words
The constant phase limiter described in claim 1 which comprises a first stage having an loading means further comprising a pi network of resistors so as to perform an attenuation function.
Claim 6
Dependent Claim
33 words
The constant phase limiter described in claim 1 or 4 which comprises a last stage having a loading means further comprising a pi network of resistors so as to perform an attenuation function.
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) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |