Patent US3601705A successfully refreshed from Google Patents.
US3601705A
Expired / Lapsed
US
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Frequency multiplication and displacement
Assignee: Mobil Oil AS
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Filing: 1969-04-02
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Granted: 1971-08-24
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Expires: 1989-04-02
Abstract
Abstract A circuit for displacing a signal 90* comprising a frequency doubler wherein an input square wave is differentiated and clipped. The frequency doubler also inverts the square wave, differentiates the inverted square wave and clips the differentiated inverted square wave. The two clipped signals are then added to provide a signal having a frequency twice that of the input square wave. This signal is applied to a sawtooth generator which provides an output signal to actuate a Schmitt trigger. The Schmitt trigger generates a square wave having a frequency twice that of the input square wave for actuating a bistable vibrator. The output of the bistable vibrator is a square wave displaced 90* from the input square wave.
Inventors
- 👤 Reimar Germann
- 👤 Kurt Wiederwohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:06
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
219 words
A circuit for displacing a signal 90* comprising, in combination: means for generating a first square-wave signal having a first frequency, a first circuit portion comprising means for differentiating said first square-wave signal to generate a signal having alternating positive and negative states, and means for clipping one of the states of the differentiated square-wave signal, a second circuit portion connected in parallel with said first circuit portion comprising means for inverting said first square-wave signal, means for differentiating said inverted square-wave signal to generate a signal having alternating positive and negative states, and means for clipping the same state of the differentiated inverted square-wave signal as clipped by said first circuit portion, means responsive to each of the clipped signals from said first and second circuit portions for generating an output signal having a frequency twice that of said first square-wave signal, means responsive to said output signal for generating a sawtooth wave signal having a frequency equal to that of said output signal, a Schmitt trigger circuit responsive to said sawtooth wave signal generating a second square-wave signal having a frequency equal to that of said sawtooth wave signal, and a bistable vibrator responsive to said second square-wave signal for generating a third square wave displaced 90* from said first square wave and having said first frequency.
Claim 2
Dependent Claim
219 words
A circuit for displacing a signal 90* comprising, in combination: means for generating a first square-wave signal having a first frequency, a first circuit portion comprising means for differentiating said first square-wave signal to generate a signal having alternating positive and negative states, and means for clipping one of the states of the differentiated square-wave signal, a second circuit portion connected in parallel with said first circuit portion comprising means for inverting said first square-wave signal, means for differentiating said inverted square-wave signal to generate a signal having alternating positive and negative states, and means for clipping the same state of the differentiated inverted square-wave signal as clipped by said first circuit portion, means responsive to each of the clipped signals from said first and second circuit portions for generating an output signal having a frequency twice that of said first square-wave signal, means responsive to said output signal for generating a sawtooth wave signal having a frequency equal to that of said output signal, a Schmitt trigger circuit responsive to said sawtooth wave signal generating a second square-wave signal having a frequency equal to that of said sawtooth wave signal, and a bistable vibrator responsive to said second square-wave signal for generating a third square wave displaced 90* from said first square wave and having said first frequency.
Claim 3
Dependent Claim
51 words
The circuit of claim 1 wherein said output signal generating means comprises: an OR gate responsive to each of the clipped signals from said first and second circuit portions, and means responsive to said OR gate for generating a square-wave signal having a frequency twice that of said first square-wave signal.
Claim 4
Dependent Claim
26 words
The circuit of claim 1 wherein said output signal generating means comprises: means for superimposing said clipped signals upon one another to generate said output signal.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |