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US4897618A
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Harmonic frequency selecting circuit
Assignee: ETS Lindgren Inc
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Filing: 1989-06-05
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Granted: 1990-01-30
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Expires: 2009-06-05
Abstract
Abstract A harmonic frequency selecting circuit is provided that simply and effectively provides a desired harmonic frequency output signal and that eliminates the need for frequency multiplier circuits. The harmonic frequency selecting circuit includes an oscillator circuit for generating a fundamental frequency signal and a plurality of harmonic frequency signals of the fundamental frequency signal. A phase modulator circuit is coupled to the oscillator circuit for selectively variably attenuating the generated fundamental and harmonic frequency signals. A bandpass filter circuit is coupled to the phase modulator circuit for selecting a predetermined harmonic frequency output signal.
Inventors
- 👤 Dale G. Svetanoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:15
CPC Classifications
H; H03; H03C; H03C3/00; H03B; H03B19/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
60 words
A harmonic frequency selecting circuit comprising: oscillator means for generating a fundamental frequency signal and a plurality of harmonic frequency signals of said fundamental frequency signal; phase modulator means coupled to said oscillator means for selectively variably attenuating said generated frequency signals; and bandpass filter means coupled to said phase modulator means for selecting a predetermined harmonic frequency output signal.
Claim 2
Dependent Claim
60 words
A harmonic frequency selecting circuit comprising: oscillator means for generating a fundamental frequency signal and a plurality of harmonic frequency signals of said fundamental frequency signal; phase modulator means coupled to said oscillator means for selectively variably attenuating said generated frequency signals; and bandpass filter means coupled to said phase modulator means for selecting a predetermined harmonic frequency output signal.
Claim 3
Dependent Claim
31 words
A harmonic frequency selecting circuit as recited in claim 1 wherein said oscillator means include a single transistor stage, a series coupled combination of at least one crystal, inductor and capacitor.
Claim 4
Dependent Claim
29 words
A harmonic frequency selecting circuit as recited in claim 2 wherein said crystal is rated for resonant fundamental oscillation frequency in a range between 112 MHz and 116 MHz.
Claim 5
Dependent Claim
20 words
A harmonic frequency selecting circuit as recited in claim 2 wherein said capacitor is a variable capacitor rated between 2.5-10pF.
Claim 6
Dependent Claim
20 words
A harmonic frequency selecting circuit as recited in claim 4 wherein said inductor has an inductance value of approximately 0.108μH.
Claim 7
Dependent Claim
41 words
A harmonic frequency selecting circuit as recited in claim 1 wherein said oscillator means include a transistor, a crystal coupled to the emitter of said transistor and a series resonant circuit with said crystal including at least one adjustable capacitance device.
Claim 8
Dependent Claim
45 words
A harmonic frequency selecting circuit as recited in claim 1 wherein said phase modulator means include a first resonant circuit, a second resonant circuit coupled in parallel with said first resonant circuit and a resonant coupling capacitor connected between said first and second resonant circuits.
Claim 9
Dependent Claim
28 words
A harmonic frequency selecting circuit as recited in claim 7 wherein said resonant coupling capacitor has a capacitance value selectively provided for variably attenuating said generated frequency signals.
Claim 10
Dependent Claim
34 words
A harmonic frequency selecting circuit as recited in claim 7 wherein each said first and second resonant circuits include a voltage-variable capacitance diode and a capacitor connected in series with said voltage-variable capacitance diode.
Claim 11
Dependent Claim
42 words
A harmonic frequency selecting circuit as recited in claim 9 further comprising a first inductor and a second inductor connected in series between a junction of said series connected voltage-variable capacitance diode and said capacitor of said first and second resonant circuits.
Claim 12
Dependent Claim
27 words
A harmonic frequency selecting circuit as recited in claim 10 wherein a modulation signal is applied to a junction of said first and second series connected inductors.
Claim 13
Dependent Claim
42 words
A harmonic frequency selecting circuit as recited in claim 9 further comprising a first resistor and a second resistor connected in series between a junction of said series connected voltage-variable capacitance diode and said capacitor of said first and second resonant circuits.
Claim 14
Dependent Claim
28 words
A harmonic frequency selecting circuit as recited in claim 12 wherein a biasing voltage signal is applied to a junction of said first and second series connected resistors.
Claim 15
Dependent Claim
38 words
A harmonic frequency selecting circuit as recited in claim 7 wherein said resonant coupling capacitor has a capacitance value of approximately 1pF and said first and second resonant circuits include a substantially equal capacitance value of approximately 27pF.
Claim 16
Dependent Claim
25 words
A harmonic frequency selecting circuit as recited in claim 7 wherein said resonant coupling capacitor has a variable capacitance value in a range between 0.8-4.0pF.
Claim 17
Dependent Claim
41 words
A harmonic frequency selecting circuit as recited in claim 7 wherein said resonant coupling capacitor includes leads and each said first and second resonant circuits include a capacitor having leads, said capacitor leads providing inherent lead inductance for resonant tuning operation.
Claim 18
Dependent Claim
73 words
A harmonic frequency selecting circuit comprising: oscillator means for generating a fundamental frequency signal and a plurality of harmonic frequency signals of said fundamental frequency signal, said oscillator means include a single stage transistor and a series resonant crystal; phase modulator means coupled to said oscillator means for selectively variably attenuating said generated frequency signals; and bandpass filter means coupled to said phase modulator means for selecting a predetermined harmonic frequency output signal.
Claim 19
Dependent Claim
73 words
A harmonic frequency selecting circuit comprising: oscillator means for generating a fundamental frequency signal and a plurality of harmonic frequency signals of said fundamental frequency signal, said oscillator means include a single stage transistor and a series resonant crystal; phase modulator means coupled to said oscillator means for selectively variably attenuating said generated frequency signals; and bandpass filter means coupled to said phase modulator means for selecting a predetermined harmonic frequency output signal.
Claim 20
Dependent Claim
42 words
A harmonic frequency selecting circuit as recited in claim 17 wherein said phase modulator means includes a first capacitor and a second capacitor coupled in parallel with said first capacitor and a third coupling capacitor connected between said first and second capacitors.
Claim 21
Dependent Claim
36 words
A harmonic frequency selecting circuit as recited in claim 18 wherein said first and second capacitors have a substantially identical capacitance value and have a capacitance ratio of approximately 25:1 with said third coupling capacitor .
Claim 22
Dependent Claim
88 words
A harmonic frequency selecting circuit comprising: crystal oscillator means for generating a fundamental frequency signal and a plurality of harmonic frequency signals of said fundamental frequency signal; phase modulator means coupled to said oscillator means for resonant tuning a predetermined harmonic frequency signal and for substantially attenuating predefined ones of said generated frequency signals; and bandpass filter means coupled to said phase modulator means for selectively passing said predetermined harmonic frequency signal, whereby a carrier signal is provided by said predetermined harmonic frequency signal eliminating frequency multiplier stages.
Claim 23
Dependent Claim
88 words
A harmonic frequency selecting circuit comprising: crystal oscillator means for generating a fundamental frequency signal and a plurality of harmonic frequency signals of said fundamental frequency signal; phase modulator means coupled to said oscillator means for resonant tuning a predetermined harmonic frequency signal and for substantially attenuating predefined ones of said generated frequency signals; and bandpass filter means coupled to said phase modulator means for selectively passing said predetermined harmonic frequency signal, whereby a carrier signal is provided by said predetermined harmonic frequency signal eliminating frequency multiplier stages.
References Cited (Backward Citations)
US4258436A
Cited
US4723113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |