US3754194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency stabilization for lsa oscillator
Assignee: Cayuga Associates Inc
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Filing: 1972-04-03
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Granted: 1973-08-21
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Expires: 1992-04-03
Abstract
Abstract To compensate for changes in the output frequency of an LSA mode oscillator, the bias voltage pulse applied to the oscillator is varied by means of a feedback circuit. The output of a high or low pass filter receiving the oscillator RF output is retified to trigger a monostable multivibrator. In an advantageous technique, the pulse output of the multivibrator is integrated, amplified and applied to a Zener diode which is connected to the bias voltage input of the oscillator to provide a clipping voltage to the oscillator responsive to changes in the RF output. A constant voltage is applied to the integrator along with the monostable output to prevent low repetition rates of the multivibrator from introducing a significant AC component in the integrator output. Different rates of convergence are provided in the feedback loop by employing a monostable multivibrator whose output pulse width is controlled by an RF discriminator circuit. To determine more precisely the frequency at which the multivibrator is triggered, a differential amplifier system is added to compare the power in the filter output with the power in the unfiltered RF output.
Inventors
- 👤 W Camp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:46
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/02; H03B; H03B9/00; H03B9/12
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
212 words
A frequency stabilizing system for a semi-conductor oscillator which exhibits bulk negative resistivity in the LSA mode and produces a pulsed RF output when a pulsed bias voltage substantially above the Gunn threshold is applied to an input of said semi-conductor at a predetermined repetition rate, said system comprising: a feedback circuit including discriminator means adapted to receive a portion of said RF output for producing an output indicative of the level of said RF output relative to a first predetermined frequency; said discriminator means including a filter means connected to receive said portion of said RF output; monostable means operatively connected to said filter means for producing a pulse output triggered in response to the output of said filter means; said circuit further including a voltage adjusting means adapted to be connected to said semi-conductor input with said applied bias voltage and receiving said discriminator means output for altering said applied bias voltage to compensate for changes in the frequency of said RF output; integrator means connected tO receive said monostable pulse output for producing an integrated output; said voltage adjusting means including diode means adapted to be connected to said semi-conductor input between said applied bias voltage and the output of said integrator means for clipping said applied bias voltage.
Claim 2
Dependent Claim
212 words
A frequency stabilizing system for a semi-conductor oscillator which exhibits bulk negative resistivity in the LSA mode and produces a pulsed RF output when a pulsed bias voltage substantially above the Gunn threshold is applied to an input of said semi-conductor at a predetermined repetition rate, said system comprising: a feedback circuit including discriminator means adapted to receive a portion of said RF output for producing an output indicative of the level of said RF output relative to a first predetermined frequency; said discriminator means including a filter means connected to receive said portion of said RF output; monostable means operatively connected to said filter means for producing a pulse output triggered in response to the output of said filter means; said circuit further including a voltage adjusting means adapted to be connected to said semi-conductor input with said applied bias voltage and receiving said discriminator means output for altering said applied bias voltage to compensate for changes in the frequency of said RF output; integrator means connected tO receive said monostable pulse output for producing an integrated output; said voltage adjusting means including diode means adapted to be connected to said semi-conductor input between said applied bias voltage and the output of said integrator means for clipping said applied bias voltage.
Claim 3
Dependent Claim
14 words
The system of claim 1, wherein said filter means is a high pass filter.
Claim 4
Dependent Claim
14 words
The system of claim 1, wherein said filter means is a low pass filter.
Claim 5
Dependent Claim
14 words
The system of claim 1, further comprising means for continuously discharging said integrator means.
Claim 6
Dependent Claim
23 words
The system of claim 1, wherein said integrator means has a time constant greater than the repetition period of said applied bias voltage.
Claim 7
Dependent Claim
23 words
The system of claim 4, wherein said discharging means provides a time constant greater than the repetition period of said applied bias voltage.
Claim 8
Dependent Claim
26 words
The system of claim 1, wherein the width of said monostable pulse output is a large fraction of the repetition period of said applied bias voltage.
Claim 9
Dependent Claim
12 words
The system of claim 1, wherein said diode is a Zener diode.
Claim 10
Dependent Claim
23 words
The system of claim 8, further comprising an amplifier connected between said integrator means and said Zener diode for amplifying the integrator output.
Claim 11
Dependent Claim
53 words
The system of claim 1, further comprising means connected to the input of said integrator to apply thereto a DC bias voltage approximately equal to one-half of the time-averaged voltage which would be applied to said integrator means if said monostable means were triggered during every repetition period of said applied bias voltage.
Claim 12
Dependent Claim
110 words
The system of claim 1, wherein said monostable means has at least two selectable output pulse widths, and a discriminator circuit connected to receive a portion of said RF output for producing a pulse width control output to said monostable means indicative of the level of said RF output relative to a second predetermined frequency differing from said first predetermined frequency such that the larger output pulse width of said monostable means will be selected when said RF output is further from said first predetermined frequency and the smaller of said monostable output pulse widths will be selected when said RF output is between said first and second predetermined frequencies.
Claim 13
Dependent Claim
26 words
The system of claim 1, further comprising means for varying the cut-off frequency of said filter means to select a desired frequency of said RF output.
Claim 14
Dependent Claim
60 words
The system of claim 1, wherein said discriminator means includes filter means connected to receive said portion of said RF output, and means responsive to the power level of the output of said filter means and the power level of said RF output for rendering said discriminator means output independent of changes in said power level of said RF output.
Claim 15
Dependent Claim
165 words
The system of claim 13, wherein said discriminator means further includes first RF detector means for producing an output indicative of the output of said filter means, first integrator means connected to receive the output of said first detector means, second RF detector means adapted to receive a portion of said RF output for producing an output indicative of the level of said RF output, second integrator means connected to receive the output of said second detector means, differential means operatively connected to produce an output indicative of the difference between said first and second integrator outputs, monostable means operatively connected to said differential means for producing a pulse output in response to the output of said differential means, and third integrator means connected to receive said monostable pulse output; said voltage adjusting means including breakdown diode means adapted to be connected to said semiconductor input between said applied bias voltage and the output of said third integrator means for clipping said applied bias voltage.
Claim 16
Dependent Claim
65 words
The system of claim 14, wherein said monostable means is connected to receive said second detector output as a triGger signal for producing said pulse output in response to both said second detector output and said differential means output, said differential means being connected to said monostable means such that said trigger signal is blocked when said differential means output is at a predetermined level.
Claim 17
Dependent Claim
145 words
A frequency control system, comprising a voltage controlled oscillator producing a pulsed RF output, filter means connected to receive a portion of said RF output, first RF detector means connected to receive the output of said filter means, first integrator means connected to receive the output of said first detector means, second RF detector means connected to receive a portion of sa1d RF output, second integrator means connected to receive the output of said second detector means, differential means connected to receive the outputs of said first and second integrator means for producing an output indicative of the difference between said first and second integrator means outputs, and voltage adjusting means operatively connected between the output of said differential means and the voltage control input to said oscillator for adjusting the voltage applied to said oscillator to compensate for changes in said RF output frequency.
Claim 18
Dependent Claim
145 words
A frequency control system, comprising a voltage controlled oscillator producing a pulsed RF output, filter means connected to receive a portion of said RF output, first RF detector means connected to receive the output of said filter means, first integrator means connected to receive the output of said first detector means, second RF detector means connected to receive a portion of sa1d RF output, second integrator means connected to receive the output of said second detector means, differential means connected to receive the outputs of said first and second integrator means for producing an output indicative of the difference between said first and second integrator means outputs, and voltage adjusting means operatively connected between the output of said differential means and the voltage control input to said oscillator for adjusting the voltage applied to said oscillator to compensate for changes in said RF output frequency.
Claim 19
Dependent Claim
69 words
The system of claim 16, wherein said voltage adjusting means includes monostable means for producing a pulsed output controlled in response to the level of the output of said differential means, an integrating circuit connected to receive said monostable pulse output, and control means operatively connected between said integrating circuit and said oscillator input for providing a variable voltage thereto in response to the output of said integrating circuit.
Claim 20
Dependent Claim
51 words
The system of claim 17, wherein said oscillator input is adapted to receive a pulsed control voltage and said control means includes diode means operatively connected between said oscillator input and said integrating circuit to apply a clipping voltage to said oscillator input dependent on the output of said integrating circuit.
Claim 21
Dependent Claim
47 words
The system of claim 17, wherein said monostable means is connected to receive said second detector output as a trigger signal, said differential means being connected to said monostable means such that said trigger signal is blocked when said differential means output is at a predetermined level.
Claim 22
Dependent Claim
184 words
A frequency stabilizing system for a semi-conductor oscillator which exhibits bulk negative resistivity in the LSA mode and produces a pulsed RF output when a pulsed bias voltage substantially above the Gunn threshold is applied to an input of said semi-conductor, comprising a feedback circuit including first discriminator means adapted to receive a portion of said RF output for producing a trigger output indicative of the level of said RF output relative to a first predetermined frequency, a voltage adjusting circuit responsive to said trigger output and adapted to be connected to said semi-conductor input for changing said bias voltage by one of two different increments, and second discriminator means adapted to receive a portion of said RF output for producing an increment selection output to said voltage adjusting means indicative of the level of said RF output relative to a second predetermined frequency such that the larger increment of said bias voltage is selected when said RF output is further from said first predetermined frequency and the smaller increment is selected when said RF output is between said first and second predetermined frequencies.
Claim 23
Dependent Claim
184 words
A frequency stabilizing system for a semi-conductor oscillator which exhibits bulk negative resistivity in the LSA mode and produces a pulsed RF output when a pulsed bias voltage substantially above the Gunn threshold is applied to an input of said semi-conductor, comprising a feedback circuit including first discriminator means adapted to receive a portion of said RF output for producing a trigger output indicative of the level of said RF output relative to a first predetermined frequency, a voltage adjusting circuit responsive to said trigger output and adapted to be connected to said semi-conductor input for changing said bias voltage by one of two different increments, and second discriminator means adapted to receive a portion of said RF output for producing an increment selection output to said voltage adjusting means indicative of the level of said RF output relative to a second predetermined frequency such that the larger increment of said bias voltage is selected when said RF output is further from said first predetermined frequency and the smaller increment is selected when said RF output is between said first and second predetermined frequencies.
Claim 24
Dependent Claim
162 words
A feedback control system, comprising a controlled element producing an output whose level is dependent on the level of a control signal, discriminator means receiving at least a portion of said controlled element output for producing a trigger output indicative of the level of said element output relative to a predetermined level, monostable means for producing an output pulse of predetermined width in response to said trigger output, integrator means connecTed to receive said monostable pulse, means connected to the input of said integrator to apply thereto a constant DC bias voltage approximately equal in magnitude to one-half of the time-averaged signal level which would be applied to said integrator means if said monostable means were activated as often as possible by said trigger output, and adjusting means responsive to the output of said integrator means operatively connected to change the level of said control signal applied to said controlled element to compensate for changes in the output of said controlled element.
Claim 25
Dependent Claim
162 words
A feedback control system, comprising a controlled element producing an output whose level is dependent on the level of a control signal, discriminator means receiving at least a portion of said controlled element output for producing a trigger output indicative of the level of said element output relative to a predetermined level, monostable means for producing an output pulse of predetermined width in response to said trigger output, integrator means connecTed to receive said monostable pulse, means connected to the input of said integrator to apply thereto a constant DC bias voltage approximately equal in magnitude to one-half of the time-averaged signal level which would be applied to said integrator means if said monostable means were activated as often as possible by said trigger output, and adjusting means responsive to the output of said integrator means operatively connected to change the level of said control signal applied to said controlled element to compensate for changes in the output of said controlled element.
References Cited (Backward Citations)
US3529259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |