US4555675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for compensating temperature drifts of the gain of an ultra-high frequency electric signal amplifier
Assignee: Thales SA
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Filing: 1984-01-10
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Granted: 1985-11-26
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Expires: 2004-01-10
Abstract
Abstract A device for compensating the temperature drifts of the gain of an ultra-high frequency electric signal amplifier, having a bi-gate field effect transistor coupled by a first gate to the ultra-high frequency signal source and by its output to the input of the amplifier. It also comprises a temperature sensor coupled to the second gate of the bi-gate transistor for controlling the gain of the bi-gate transistor as a function of the temperature variations.
Inventors
- 👤 Monique Blanchandin
- 👤 Roland Girardat
- 👤 Jean-Michel Vanestrenvord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:51
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/007; H03F; H03F1/00; H03F1/30; H03F1/301; H03F1/306
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
A device to compensate for temperature drift in the gain of an amplifier which amplifies ultra-high frequency signals generated by an ultra-high frequency signal source, comprising: a bi-gate field effect transistor with a gain and having an output adapted for connection to said amplifier, a first input adapted for connection to said ultra-high frequency source, and a second input; and linear temperature sensor means, coupled to said bi-gate transistor second input, for controlling said bi-gate transistor gain as a function of temperature variations.
Claim 2
Independent Claim
83 words
A device to compensate for temperature drift in the gain of an amplifier which amplifies ultra-high frequency signals generated by an ultra-high frequency signal source, comprising: a bi-gate field effect transistor with a gain and having an output adapted for connection to said amplifier, a first input adapted for connection to said ultra-high frequency source, and a second input; and linear temperature sensor means, coupled to said bi-gate transistor second input, for controlling said bi-gate transistor gain as a function of temperature variations.
Claim 3
Dependent Claim
24 words
The device as claimed in claim 1, wherein said bi-gate transistor gain is controlled so as to vary linearly as a function of temperature.
Claim 4
Dependent Claim
31 words
The device as claimed in claim 2, wherein said temperature sensor means acts on said bi-gate transistor so as to increase the gain of said bi-gate transistor when the temperature increases.
Claim 5
Dependent Claim
91 words
A device according to claim 3 wherein said temperature sensor means includes: first means, having an output, for providing a variable voltage which varies as a function of temperature; second means for producing a fixed reference voltage; and differential amplifier means, having a first input coupled to said first means output and a second input coupled to said second means and an output coupled to said bi-gate transistor second input, for controlling said bi-gate transistor gain as a function of a difference existing between said variable voltage and said fixed voltage.
Claim 6
Dependent Claim
18 words
The device as claimed in claim 4, wherein said first means includes a plurality of series connected diodes.
Claim 7
Dependent Claim
33 words
The device as claimed in claim 4, wherein said first means includes a plurality of series connected diodes coupled in parallel to at least one element which varies as a function of temperature.
Claim 8
Dependent Claim
34 words
The device as claimed in claim 6, wherein said first means further include means for adjusting said variable voltage to obtain a zero voltage at said first means output at a reference ambient temperature.
Claim 9
Dependent Claim
32 words
The device as claimed in claim 4, wherein said second means includes means for regulating said reference voltage to adjust said bi-gate transistor gain to any value at a reference ambient temperature.
References Cited (Backward Citations)
US4442410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |