Patent US5268601A successfully refreshed from Google Patents.
US5268601A
Expired / Lapsed
US
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Logarithmic amplifier circuit with temperature compensation
Assignee: COSSINS PETER
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Filing: 1990-05-18
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Granted: 1993-12-07
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Expires: 2010-05-18
Abstract
Abstract An amplification circuit comprises a detector (15) for detecting transmitted radio signals in the range 0.5 GHz to 20 GHz and a wideband logarithmic video amplifier (WLVA 16). The WLVA is fabricated on an application specific integrated circuit (17) for example with a temperature sensor (20). The output from the temperature sensor is supplied to a second ASIC (24) which samples the temperature signal and supplies compensation signals read from a non-volatile memory device.
Inventors
- 👤 Peter A. Cossins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:46
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
217 words
An amplification circuit comprising: detecting means having an input to which transmitted radio signals are applied for detecting radio signals having a frequency in the range of 0.5 GHz to 20 GHz, and for outputting said detected signals; a wideband amplifier connected to said detecting means for effecting an amplifying operation to said detected signals, said wideband amplifier being a multi-stage amplifier, each stage having plural amplifying operation characteristics, each characteristic being adjustable in response to one of a plurality of control signals, the amplifier being fabricated on a first common integrated circuit; and temperature compensation means coupled to said amplifier for compensating for temperature related changes in the amplifying operation of said amplifier, said temperature compensation means including: a temperature sensor for producing a temperature signal indicative of the temperature of said amplifier, said temperature sensor also being fabricated on said first common integrated circuit; sampling means connected to said temperature sensor for sampling said temperature signal; storing means for storing compensation parameters; and processing means connected to said sampling means and said storing means for processing said temperature signal and said compensation parameters to produce said plurality of control signals and supplying said control signals to said amplifier, thereby to compensate for temperature related changes such that the amplifying operation of said amplifier remains constant.
Claim 2
Dependent Claim
217 words
An amplification circuit comprising: detecting means having an input to which transmitted radio signals are applied for detecting radio signals having a frequency in the range of 0.5 GHz to 20 GHz, and for outputting said detected signals; a wideband amplifier connected to said detecting means for effecting an amplifying operation to said detected signals, said wideband amplifier being a multi-stage amplifier, each stage having plural amplifying operation characteristics, each characteristic being adjustable in response to one of a plurality of control signals, the amplifier being fabricated on a first common integrated circuit; and temperature compensation means coupled to said amplifier for compensating for temperature related changes in the amplifying operation of said amplifier, said temperature compensation means including: a temperature sensor for producing a temperature signal indicative of the temperature of said amplifier, said temperature sensor also being fabricated on said first common integrated circuit; sampling means connected to said temperature sensor for sampling said temperature signal; storing means for storing compensation parameters; and processing means connected to said sampling means and said storing means for processing said temperature signal and said compensation parameters to produce said plurality of control signals and supplying said control signals to said amplifier, thereby to compensate for temperature related changes such that the amplifying operation of said amplifier remains constant.
Claim 3
Dependent Claim
26 words
An amplification circuit according to claim 1, wherein said wideband amplifier and said temperature sensor are fabricated on said first common integrated circuit using bipolar technology.
Claim 4
Dependent Claim
24 words
An amplification circuit according to claim 1, wherein said sampling means and said processing means are both fabricated on a second common integrated circuit.
Claim 5
Dependent Claim
43 words
An amplification circuit according to claim 3, wherein said processing means produces said control signals in digital form and said second common integrated circuit also includes output means for converting said digital control signals into analog control signals for said first integrated circuit.
Claim 6
Dependent Claim
18 words
An amplification circuit according to claim 3, wherein said second common integrated circuit is fabricated using CMOS technology.
Claim 7
Dependent Claim
16 words
An amplification circuit according to claim 1, wherein said wideband amplifier is a multi-stage logarithmic amplifier.
Claim 8
Dependent Claim
39 words
An amplification circuit according to claim 6, wherein each stage of said multi-stage logarithmic amplifier has adjustable gain, offset and weighting current and said gain, offset and weighting current of said amplifier stages are adjusted by said control signals.
Claim 9
Dependent Claim
18 words
An amplification circuit according to claim 4, wherein said second common integrated circuit is fabricated using CMOS technology.
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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) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |