US5283533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier signal level detector for a mobile communication system
Assignee: NEC Corp
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Filing: 1992-08-13
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Granted: 1994-02-01
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Expires: 2012-08-13
Abstract
Abstract A detector for detecting changes in the output level of an amplifier included in, for example, a mobile communication signal. A first detecting circuit produces a detected voltage having linearity against low output levels of the amplifier. A second detecting circuit produces a detected voltage which is linear against high output levels of the amplifier. The detected voltages from the first and second detecting circuits are mixed by a mixer in a predetermined ratio. Even when the output level of the amplifier changes over a broad dynamic range, the detector detects the changes with accuracy.
Inventors
- 👤 Tsuguo Hori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:23
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/04; H03G3/00; H03G3/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
176 words
A detector connected to an amplifier which amplifies an input signal whose level changes for generating a detected signal associated with an output signal of said amplifier, said detector comprising: a first coupling circuit for picking up the output signal of the amplifier in a predetermined coupling amount; a second coupling circuit for picking up an output signal of said first coupling circuit in a predetermine coupling amount; a first detecting circuit for picking up an output signal of said first coupling circuit to produce a detected voltage which has linearity against changes in a relatively low range among changes in the level of the input signal to the amplifier; a second detecting circuit for detecting the output signal of said second coupling circuit to produce a detected voltage which has linearity against changes in a relatively high range among changes in the level of the input signal to the amplifier; and a mixer for mixing the detected voltages produced by said first and second detecting circuits in a predetermined ratio to generate the detected signal.
Claim 2
Dependent Claim
176 words
A detector connected to an amplifier which amplifies an input signal whose level changes for generating a detected signal associated with an output signal of said amplifier, said detector comprising: a first coupling circuit for picking up the output signal of the amplifier in a predetermined coupling amount; a second coupling circuit for picking up an output signal of said first coupling circuit in a predetermine coupling amount; a first detecting circuit for picking up an output signal of said first coupling circuit to produce a detected voltage which has linearity against changes in a relatively low range among changes in the level of the input signal to the amplifier; a second detecting circuit for detecting the output signal of said second coupling circuit to produce a detected voltage which has linearity against changes in a relatively high range among changes in the level of the input signal to the amplifier; and a mixer for mixing the detected voltages produced by said first and second detecting circuits in a predetermined ratio to generate the detected signal.
Claim 3
Dependent Claim
63 words
A detector as claimed in claim 1, wherein said mixer comprises: a first input circuit for multiplying the detected voltage from said first detecting circuit by x; a second input circuit for multiplying the detected voltage from said second detecting circuit by 1/y; and an output circuit for mixing outputs of said first and second input circuits to thereby produce the detected signal.
References Cited (Backward Citations)
US3434065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-31 | 1997-08-02 | 1998-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-31 | 2001-08-02 | 2002-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-31 | 2005-08-02 | 2006-02-01 | $7700.00 | Window Closed / Lapsed |