US5111083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detection circuit for detecting a predetermined signal from a composite signal
Assignee: Murata Manufacturing Co Ltd
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Filing: 1990-11-29
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Granted: 1992-05-05
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Expires: 2010-11-29
Abstract
Abstract The detection circuit includes a first synchronism detection circuit for synchronous detection of an input signal. A second synchronism detection circuit synchronously detects the input signal separately from the first synchronism detection circuit. A phase-shifting circuit outputs differently phased signals to the first synchronism detection circuit and the second synchronism detection circuit. A first smoothing circuit smooths the output of the first synchronism detection circuit. A second smoothing circuit smooths the output of the second synchronism detection circuit. A composite circuit adds the outputs of the first smoothing circuit and the second smoothing circuit. Even when a drift component is contained in the input signal, the detection circuit will output a predetermined output signal in which the drift component is suppressed.
Inventors
- 👤 Takeshi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:27
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/56; G01C19/5642; G01C19/5649; H; H03; H03K; H03K9/00; H03K9/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A detection circuit comprising: a first synchronism detection circuit for synchronous detection of an input signal; a second synchronism detection circuit for synchronous detection of said input signal separately from said first synchronism detection circuit; a phase-shifting circuit, connected to said first and second synchronous detection circuits, for outputting a signal having a first phase to said first synchronism detection circuit and having a second phase to said second synchronism detection circuit; a first smoothing circuit, connected to said first synchronous detection circuit, for smoothing an output of said first synchronism detection circuit; a second smoothing circuit, connected to said second synchronous detection circuit, for smoothing an output of said second synchronism detection circuit; and a composite circuit, connected to said first and second smoothing circuits, for adding outputs of said first smoothing circuit and said second smoothing circuit and for outputting a composed signal.
Claim 2
Dependent Claim
145 words
A detection circuit comprising: a first synchronism detection circuit for synchronous detection of an input signal; a second synchronism detection circuit for synchronous detection of said input signal separately from said first synchronism detection circuit; a phase-shifting circuit, connected to said first and second synchronous detection circuits, for outputting a signal having a first phase to said first synchronism detection circuit and having a second phase to said second synchronism detection circuit; a first smoothing circuit, connected to said first synchronous detection circuit, for smoothing an output of said first synchronism detection circuit; a second smoothing circuit, connected to said second synchronous detection circuit, for smoothing an output of said second synchronism detection circuit; and a composite circuit, connected to said first and second smoothing circuits, for adding outputs of said first smoothing circuit and said second smoothing circuit and for outputting a composed signal.
Claim 3
Dependent Claim
27 words
A detection circuit in accordance with claim 1, wherein said first synchronism detection circuit and said second synchronism detection circuit have a phase difference of 90 degree.
Claim 4
Dependent Claim
40 words
A detection circuit in accordance with claim 2, wherein said first synchronism detection circuit and said second synchronism detection circuit respectively include an FET having a source connected to said input signal and a gate connected to said phase-shifting circuit.
Claim 5
Dependent Claim
23 words
A detection circuit in accordance with claim 3, wherein said first smoothing circuit and said second smoothing circuit respectively include an RC filter.
Claim 6
Dependent Claim
17 words
A detection circuit in accordance with claim 4, wherein said composite circuit includes a differential amplifying circuit.
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) | 1995-05-05 | 1995-11-04 | 1996-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-05 | 1999-11-04 | 2000-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-05 | 2003-11-04 | 2004-05-05 | $7700.00 | Window Closed / Lapsed |