US5434537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for measuring the output power from an amplifier
Assignee: Nokia Oyj
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Filing: 1994-02-08
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Granted: 1995-07-18
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Expires: 2014-02-08
Abstract
Abstract The object of the invention is a circuit for monitoring the power of a transmitter amplifier. In the solution according to the invention, the detected DC voltage level (V det ) corresponding to the output power is compressed at high output levels by using as the coupling capacitance a capacitance diode (7) such that the capacitance of this component, and thereby the tightness of the coupling, diminishes as the detected voltage level increases. The invention can be employed, for example, in the power control of a mobile phone's transmitter.
Inventors
- 👤 Osmo Kukkonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:34
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; G; G01; G01R; G01R21/00; G01R21/10; G01R21/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A circuit for monitoring power output from an amplifier, comprising: a controllable varactor diode for sampling the power output from the amplifier; detecting circuit means coupled to an output of the varactor diode for generating a DC voltage corresponding to the magnitude of a sample from the varactor diode; and circuit means connected between said varactor diode and said detecting circuit means for coupling at least a portion of the DC voltage to a control electrode of the varactor diode to vary a reverse bias voltage thereacross in accord with a magnitude of said portion of the DC voltage, for controlling a level of sampling of said power output from the amplifier so that at high levels of power output, lesser values of said power output are coupled to said detecting circuit means.
Claim 2
Dependent Claim
133 words
A circuit for monitoring power output from an amplifier, comprising: a controllable varactor diode for sampling the power output from the amplifier; detecting circuit means coupled to an output of the varactor diode for generating a DC voltage corresponding to the magnitude of a sample from the varactor diode; and circuit means connected between said varactor diode and said detecting circuit means for coupling at least a portion of the DC voltage to a control electrode of the varactor diode to vary a reverse bias voltage thereacross in accord with a magnitude of said portion of the DC voltage, for controlling a level of sampling of said power output from the amplifier so that at high levels of power output, lesser values of said power output are coupled to said detecting circuit means.
Claim 3
Dependent Claim
30 words
A circuit as set forth in claim 1, further comprising: a comparator for comparing said DC voltage with a reference voltage and for forming a control voltage for the amplifier.
Claim 4
Dependent Claim
18 words
A circuit as set forth in claim 1, wherein the controllable sampling means further comprises a directional coupler.
Claim 5
Dependent Claim
18 words
A circuit as set forth in claim 1, wherein the controllable sampling means further comprises a coupling capacitor.
References Cited (Backward Citations)
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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) | 1998-07-17 | 1999-01-16 | 1999-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-17 | 2003-01-16 | 2003-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-17 | 2007-01-16 | 2007-07-18 | $7700.00 | Window Closed / Lapsed |