US4199734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal oscillator having switchably disabled harmonic-tuned output circuit
Assignee: Canon Production Printing Germany GmbH and Co KG
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Filing: 1978-11-28
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Granted: 1980-04-22
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Expires: 1998-11-28
Abstract
Abstract An oscillator is disclosed having a one-stage amplifier and a quartz crystal resonator which operates in series resonance with a L-C oscillating circuit. An oscillating circuit which is tuned to a harmonic of the oscillator frequency is also provided which is connected via a filter device to an output of the amplifier stage. A switching device is provided which short circuits the oscillating circuit tuned to a harmonic as and when required.
Inventors
- 👤 Anton Dressen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:42
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
An oscillator comprising: a one-stage amplifier and a quartz crystal resonator which operates in series resonance to a LC oscillating circuit; a harmonic tuned oscillating circuit which is tuned to a harmonic of a frequency of the quartz crystal resonator and which is connected via a filter means to an output of the amplifier; and a switching means for short-circuiting the harmonic tuned oscillating circuit when required.
Claim 2
Dependent Claim
67 words
An oscillator comprising: a one-stage amplifier and a quartz crystal resonator which operates in series resonance to a LC oscillating circuit; a harmonic tuned oscillating circuit which is tuned to a harmonic of a frequency of the quartz crystal resonator and which is connected via a filter means to an output of the amplifier; and a switching means for short-circuiting the harmonic tuned oscillating circuit when required.
Claim 3
Dependent Claim
94 words
The oscillator of claim 1 wherein the switching means comprises a first diode path of series-connected switching diodes and a following second diode path with parallel-connected switching diodes, one of the parallel-connecting switching diodes being connected to the harmonic tuned oscillating circuit and another of the diodes being connected to a reference potential, and a control switch means which precedes the first and second diode paths in a blocking direction of the diodes for short-circuiting the harmonic tuned oscillating circuit when required by feeding the first and second diode paths with an operating voltage.
Claim 4
Dependent Claim
33 words
The oscillator of claim 1 wherein the switching means includes a control switch means for selectively forward biasing a diode means, said diode means being connected to short-circuit the harmonic tuned oscillating circuit.
Claim 5
Dependent Claim
86 words
An oscillator, comprising: a crystal oscillator having an LC resonant circuit; a harmonic tuned LC resonant circuit tuned to a harmonic f of an operating frequency of the crystal oscillator; an output connected to the harmonic tuned LC resonant circuit; coupling means connecting the harmonic tuned LC resonant circuit to the crystal oscillator; and switching means connected to selectively stop oscillations in the harmonic tuned LC resonant circuit and remove on oscillation signal of harmonic f from the output while said crystal oscillator continues to oscillate.
Claim 6
Dependent Claim
86 words
An oscillator, comprising: a crystal oscillator having an LC resonant circuit; a harmonic tuned LC resonant circuit tuned to a harmonic f of an operating frequency of the crystal oscillator; an output connected to the harmonic tuned LC resonant circuit; coupling means connecting the harmonic tuned LC resonant circuit to the crystal oscillator; and switching means connected to selectively stop oscillations in the harmonic tuned LC resonant circuit and remove on oscillation signal of harmonic f from the output while said crystal oscillator continues to oscillate.
Claim 7
Dependent Claim
14 words
The oscillator of claim 4 wherein said coupling means comprises a high pass filter.
Claim 8
Dependent Claim
19 words
The oscillator of claim 4 wherein said switching means comprises means for short-circuiting the harmonic tuned LC resonant circuit.
Claim 9
Dependent Claim
12 words
The oscillator of claim 4 wherein only a single transistor is employed.
Claim 10
Dependent Claim
17 words
The oscillator of claim 4 wherein the crystal oscillator has a quartz crystal operating in harmonic fashion.
References Cited (Backward Citations)
US2543456A
Cited
US3382447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |