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US3571753A
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Phase coherent and amplitude stable frequency shift oscillator apparatus
Assignee: MOORE ASSOCIATES Inc
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Filing: 1969-09-05
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Granted: 1971-03-23
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Expires: 1989-09-05
Abstract
Abstract A phase coherent and amplitude stable frequency shift oscillator apparatus comprising a negative impedance converter, biased into an unstable oscillatory condition, in combination with a pair of impedances respectively coupled to the input terminals thereof for determining the frequency of oscillation. One of the impedances includes a series resistive-reactive impedance circuit and the other includes a parallel resistive-reactive impedance circuit. Means are provided for changing the value of the resistive components of the impedances in order to alter the output frequency of the oscillator apparatus and a level limiting and buffering means is provided for stabilizing the oscillatory operation and buffering the output obtained from the apparatus.
Inventors
- 👤 Teddy G Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:45
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
94 words
A phase coherent and amplitude stable frequency shift oscillator apparatus comprising: a negative impedance converter means biased into an unstable oscillatory condition, said converter means having a pair of input terminals; a series resistive-reactive impedance circuit coupled to one of said input terminals; a parallel resistive-reactive impedance circuit coupled to the other of said input terminals; and signal level limiting means coupled to one of said input terminals to stabilize the oscillatory action of said apparatus and cause a stable oscillator output signal to be produced at the terminal to which it is connected.
Claim 2
Dependent Claim
94 words
A phase coherent and amplitude stable frequency shift oscillator apparatus comprising: a negative impedance converter means biased into an unstable oscillatory condition, said converter means having a pair of input terminals; a series resistive-reactive impedance circuit coupled to one of said input terminals; a parallel resistive-reactive impedance circuit coupled to the other of said input terminals; and signal level limiting means coupled to one of said input terminals to stabilize the oscillatory action of said apparatus and cause a stable oscillator output signal to be produced at the terminal to which it is connected.
Claim 3
Dependent Claim
40 words
A phase coherent and amplitude stable frequency shift oscillator apparatus as recited in claim 1 wherein means are provided for simultaneously changing the resistive components of said impedance circuits to cause said oscillator apparatus to oscillate at a different frequency.
Claim 4
Dependent Claim
37 words
A phase coherent and amplitude stable frequency shift oscillator apparatus as recited in claim 2 wherein said last named means includes discrete resistance means which can be selectively connected with the resistive components of said impedaNce circuits.
Claim 5
Dependent Claim
30 words
A phase coherent and amplitude stable frequency shift oscillator apparatus as recited in claim 2 wherein said resistive components of said impedance circuits are comprised of a variable resistance means.
Claim 6
Dependent Claim
47 words
A phase coherent and amplitude stable frequency shift oscillator apparatus as recited in claim 2 wherein said signal level limiting means includes a buffering amplifier means providing a signal output terminal, said amplifier means preventing the loading of said negative impedance converter means by the output circuit.
Claim 7
Dependent Claim
121 words
a phase coherent and amplitude stable frequency shift oscillator apparatus comprising: a first impedance network means including a series combination of resistive and reactive components: a second impedance network means including a parallel combination of resistive and reactive components; a negative impedance converter means having a pair of input terminals, said first impedance network means being coupled to one of said input terminals and said second impedance network means being coupled to the other of said input terminals, said converter means being biased into an unstable operating condition; and signal level limiting means coupled to one of said input terminals to stabilize the operation of said oscillator apparatus and provide a means by which an oscillatory output signal can be obtained.
Claim 8
Dependent Claim
121 words
a phase coherent and amplitude stable frequency shift oscillator apparatus comprising: a first impedance network means including a series combination of resistive and reactive components: a second impedance network means including a parallel combination of resistive and reactive components; a negative impedance converter means having a pair of input terminals, said first impedance network means being coupled to one of said input terminals and said second impedance network means being coupled to the other of said input terminals, said converter means being biased into an unstable operating condition; and signal level limiting means coupled to one of said input terminals to stabilize the operation of said oscillator apparatus and provide a means by which an oscillatory output signal can be obtained.
Claim 9
Dependent Claim
35 words
A phase coherent and amplitude stable frequency shift oscillator apparatus as recited in claim 6 further including means for simultaneously changing said resistive components so as to change the output frequency of said oscillator apparatus.
Claim 10
Dependent Claim
42 words
A phase coherent and amplitude stable frequency shift oscillator apparatus as recited in claim 7 wherein said signal level limiting means includes a buffering amplifier which enables an oscillatory output to be obtained from said oscillator apparatus without loading the input thereof.
Claim 11
Dependent Claim
45 words
A phase coherent and amplitude stable frequency shift oscillator apparatus as recited in claim 8 wherein said resistive component changing means includes a plurality of discrete resistance means which may be selectively coupled to said resistive components so as to produce a predetermined variation thereof.
Claim 12
Dependent Claim
21 words
A phase coherent and amplitude stable frequency shift oscillator apparatus as recited in claim 8 wherein said reactive components are capacitors.
Claim 13
Dependent Claim
21 words
A phase coherent and amplitude stable frequency shift oscillator apparatus as recited in claim 8 wherein said reactive components are inductors.
Claim 14
Dependent Claim
43 words
A phase coherent and amplitude stable frequency shift oscillator apparatus as recited in claim 9 wherein said resistive components include ganged variable resistance means for enabling the resistive components of said impedance means to be simultaneously varied over a predetermined range of values.
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |