Patent US4545284A successfully refreshed from Google Patents.
Patent US4853652A successfully refreshed from Google Patents.
US4853652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide band and low noise amplifier for metric waves
Assignee: Thales SA
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Filing: 1988-03-17
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Granted: 1989-08-01
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Expires: 2008-03-17
Abstract
Abstract A wide band low noise amplifier for metric waves, including a transistor connected by its emitter to the ground of the amplifier through two secondary windings, connected in series, of a first and second transformer, and coupled between its base and its emitter by the primary winding of the first transformer, one end of the primary winding of the second transformer being connected to the collector of the transistor, the output signal of the amplifier being taken from all or part of the primary of the second transformer and the number of turns of the secondaries of the transformers being very low so as to limit the leak inductance, which amplifier further comprises a first resistor connected in series with the two secondary windings and a second resistor connected between the output of the amplifier and the transistor base.
Inventors
- 👤 Robert Collin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:03
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/347; H03F3/00; H03F3/189; H03F3/19; H03F3/191; H03F2200/00; H03F2200/372
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
A wide band low noise amplifier for metric waves, comprising a transistor connected by its emitter to the ground of the amplifier through two secondary windings, connected in series, of a first and second transformer, and coupled between its base and its emitter by the primary winding of the first transformer, one end of the primary winding of the second transformer being connected to the collector of the transistor, the output signal of the amplifier being taken from all or part of the primary of the second transformer and the number of turns of the secondaries of the transformers being very low so as to limit the leak inductance, and further comprising a first resistor connected in series with the two secondary windings and a second resistor connected between the output of the amplifier and the transistor base.
Claim 2
Dependent Claim
138 words
A wide band low noise amplifier for metric waves, comprising a transistor connected by its emitter to the ground of the amplifier through two secondary windings, connected in series, of a first and second transformer, and coupled between its base and its emitter by the primary winding of the first transformer, one end of the primary winding of the second transformer being connected to the collector of the transistor, the output signal of the amplifier being taken from all or part of the primary of the second transformer and the number of turns of the secondaries of the transformers being very low so as to limit the leak inductance, and further comprising a first resistor connected in series with the two secondary windings and a second resistor connected between the output of the amplifier and the transistor base.
Claim 3
Dependent Claim
18 words
Amplifier according to claim 1, wherein the secondary windings of said two transformers each comprise a single spire.
Claim 4
Dependent Claim
55 words
Amplifier according to claim 1, wherein the voltage gain of the amplifier is equal to -M/2, the output voltage being taken from the terminals of M turns of the primary of the second transformer, the primaries of both transformers having respectively p and N turns, p M, N being integers satisfying the expression N ((M(M+1)-p)/(p-1).
Claim 5
Dependent Claim
16 words
Amplifier as claimed in claim 3, wherein the number M is equal to the number N.
Claim 6
Dependent Claim
48 words
Amplifier as claimed in claim 4, further comprising a circuit for controlling the transistor current for regulating the current consumption of the amplifier as a function of the amplifier of interfering signals which may be received so as to obtain at all times the best possible noise factor.
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) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |