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6133795 |
Oscillator circuit
A stabilised voltage controlled oscillator circuit comprises a closed loop circuit containing a voltage controlled oscillator (34), a local oscillator (40) and a harmonic mixer (38) that mixes a...
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6078223 |
Discriminator stabilized superconductor/ferroelectric thin film local oscillator
A tunable local oscillator (10) with a tunable circuit (12) that includes a resonator (16) and a transistor (14) as an active element for oscillation. Tuning of the circuit (12) is achieved with an...
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5949290 |
Voltage controlled oscillator tuning apparatus and method
A 1-port tunable frequency discriminator that is incorporated into a frequency lock loop (FLL) for providing an improved FLL having reduced phase noise and settling times is provided. The invented...
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5912926 |
Method of and apparatus for controlling modulation of digital signals in frequency modulated transmissions
A programmable apparatus is disclosed for generating a frequency modulated signal at a selected center frequency in accordance with digital data of at least first and second data levels. The...
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5847620 |
Dielectric resonator phase shifting frequency discriminator
A dielectric resonator frequency discriminator comprising a microstrip, a single mode dielectric resonator coupled to the microstrip, at least one detector for detecting an RF signal coupled to the...
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5661439 |
Method and apparatus for cancelling phase noise
A frequency oscillator and a frequency multiplier multiplying the signals from the oscillator contain inherent phase noise. A phase noise canceller removes phase noise, due to both the oscillator...
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5587690 |
Ring resonator oscillator usable in frequency synthesizers and communication apparatus
A first oscillator includes: a ring resonator; an oscillation circuit having a negative resistance active circuit coupled to a first point on the ring resonator for oscillating at an oscillation...
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5294895 |
Microwave oscillators and transmitters with frequency stabilization
In addition to a first opening (11) forming a primary output from a waveguide cavity (10) of a microwave oscillator, a coupling aperture (12) in a reflective wall (32) provides a secondary output...
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5220292 |
Microwave oscillator with noise degeneration feedback circuit
A microwave oscillator is shown to include an oscillator having an output and a control port and a feedback circuit disposed between the output and the control port of the oscillator. The feedback...
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5204640 |
Widely tunable oscillator stabilization using analog fiber optic delay line
A circuit for stabilizing an oscillator having an oscillator output signal includes a long optical fiber delay line which receives an optical version of the oscillator output signal and a phase...
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5081424 |
Unequal stub length diplexing microwave frequency discriminator circuit
A microwave frequency discriminator circuit useful as a frequency lineariion device includes a microstrip input conductor and a pair of microstrip output conductors, a pair of resistors, a pair of...
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4961058 |
Feedback stabilization loop
Stabilizing a signal generating source by coupling a small amount of the output power through a bandpass filter tuned to the desired frequency and injecting the power back into the source. In...
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4925302 |
Frequency locking device
An improved frequency locking circuit suitable for indirectly locking an optical frequency f 0 to a radio frequency f 1 or of locking the radio frequency to the optical frequency. A beam of...
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4862108 |
Frequency locking circuit with sideband imbalance correction
Circuit imperfections in phase modulators will introduce offsets in the servo error signals in frequency locking circuits. Such offsets will also cause a frequency offset. The frequency offset is...
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4855691 |
Amplitude stabilizer for use in microwave discriminator
A microwave frequency discriminator, i.e. an electronic device for directly transforming frequency modulation on a microwave carrier into a demodulated lower frequency signal. The discriminator is...
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4780691 |
Dielectric resonator frequency discriminator for stabilizing oscillator frequency
A frequency discriminator (1) stabilizes a voltage controlled oscillator (5), particularly one operating at microwave frequencies. A single dielectric resonator (2), typically positioned within a...
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4746878 |
C. W. laser wavemeter/frequency locking technique
A wavemeter/frequency locking technique suitable for indirectly locking an optical frequency f 0 to a radio frequency f 1 or for locking the radio frequency to the optical frequency. A beam of...
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4694260 |
Microwave discriminator and devices using said discriminator
A microwave frequency discriminator, i.e. an electronic device for directly transforming frequency modulation on a microwave carrier into a demodulated lower frequency signal. The discriminator is...
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4656394 |
Particle accelerator with frequency correction
A particle accelerator with frequency correction is provided in which an electromagnetic wave, supplied by a generator, is injected into a cavity through a wave guide. A frequency corrector device...
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4631498 |
CW Laser wavemeter/frequency locking technique
A wavemeter/frequency locking technique suitable for indirectly locking an optical frequency f 0 to a radio frequency f 1 or for locking the radio frequency to the optical frequency. A beam of...
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4426732 |
Receiver having a surface elastic wave high frequency amplifier with a frequency-controlled pump oscillator
Receiver comprising at least two output means taking out electric signals corresponding to sound waves propagating in different directions in a surface elastic wave amplifier disposed in the high...
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4387347 |
Delay line frequency discriminator for stabilizing an oscillator
A delay line frequency discriminator having application to microwave equipment and particularly used for stabilizing an oscillator, including a first coupler supplied by the oscillator and...
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4243949 |
Frequency stabilization technique for microstrip oscillators
An apparatus for frequency stabilizing a microstrip oscillator using an integrated diplexer as a frequency discriminator. The crossover frequency of the microstrip diplexer is used in a feedback...
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4196398 |
Regulation of a plurality of superconducting resonators
In order to maintain a plurality of superconducting resonators, each having elastically deformable resonant structural elements, at the same natural frequency and phase position, each resonator is...
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4122408 |
Frequency stabilization utilizing multiple modulation
A system and method is disclosed for achieving frequency stabilization. A tunable element, such as a cavity structure, is stabilized through the use of multiple modulation to stabilize both the...
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4121173 |
Arrangement for automatically controlling the frequency of a hyperfrequency generator feeding a resonant element subjected to fluctuations in temperature
An arrangement enables the frequency variation of a resonant element (an accelerating section for example) to be followed in dependence upon its temperature and the frequency of the hyperfrequency...
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4084128 |
Demodulator for phase reversal modulation system
1. A receiver for use in a PSK signal translation system comprising a voltage tunable local oscillator for continuously generating a reference frequency signal from which the suppressed carrier can...
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4048580 |
Apparatus for detecting a stable microwave discrete frequency
An input signal, whose frequency is to be detected, is divided and sent i two arms. One arm applies a set phase and amplitude adjustment while the other arm has a phase response that is dependent...
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4042891 |
Frequency synthesizer having frequency control loop including fiber optic delay line
A frequency synthesizer or programmable multiple frequency source which uses a voltage-controlled oscillator (VCO) responsive to an independent control variable. The VCO is also responsive to...
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4041416 |
Method and apparatus for frequency stabilizing oscillators
Frequency stabilization of an oscillator by compensating for slow frequency variations due to ambient temperature variations is achieved by diverting a fraction of the oscillator output to a...
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4032858 |
Automatic frequency control system
A controllable oscillator is maintained at a center frequency f o by the inventive system. The oscillator signal is directly coupled to one input of a diode detector via a first path, and is...
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4009448 |
Phase lock loop for a voltage controlled oscillator
A phase lock loop configuration having a voltage controlled oscillator utilized, for example, in radar systems wherein false locking is prevented and loop bandwidth is maintained substantially...
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3977002 |
Tracking filter for frequency measurement in a Doppler type navigation guidance system or the like
A Doppler type radio navigation system in which each element of a linear array is energized discretely and sequentially to produce a simulated Doppler effect at a remote location such as an...
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3962652 |
Simplified surface acoustic wave synthesizer
A highly stable variable frequency oscillator is disclosed which employs a ultitap surface acoustic wave device as a frequency standard. A feedback path which includes a voltage controlled switch...
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3921085 |
Frequency discriminator apparatus
A frequency discriminator having a bandwidth variable from a relatively narrow range to a very wide range in which the center frequency is simultaneously tunable over an extremely wide frequency...
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3882413 |
Microwave signal source stabilized by automatic frequency and phase control loops
A microwave signal source and method for providing a microwave output signal having an improved noise characteristic are disclosed. The desirable signal characteristic is obtained by generating an...
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3858121 |
SOLID STATE MICROWAVE OSCILLATOR WITH STABILIZING RESONATOR AND AFC LOOP
A stabilized solid-state oscillator comprising a free running oscillator with its frequencies made variably by a variable reactance element, a high-Q fundamental cavity resonator coupled to the...
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3824484 |
TOUCH-TONE SIGNAL GENERATION SYSTEM
A touch-tone signal generation system includes a pair of oscillators for generating tones substantially the same as those employed in the system of American Telephone & Telegraph Co., under the...
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3761835 |
AUTOMATIC FREQUENCY CONTROL SYSTEM
The present invention relates to an automatic frequency control (AFC) system for controlling the frequency of an oscillator.
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3617944 |
MICROWAVE CIRCUIT DEVICE
A microwave circuit device composed principally of a solid state oscillator and a reaction type cavity resonator, constructed so as to develop a microwave output through a phase shifter and the...
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3604002 |
IMPLICIT BEAM ANGLE CONTROL FOR A FREQUENCY SCANNING RADAR SYSTEM
A folded waveguide serpentine transmission line is used as a reference element in a phase-lock loop arrangement for vernier adjustment of programmed frequency steps generated to produce frequency...
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3593202 |
AMPLITUDE CONTROL APPARATUS
Frequency responsive amplitude control apparatus is disclosed including means for combining a first parameter with a second parameter to produce a third parameter, and means for varying impedance...
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3568084 |
CIRCUIT FOR CONTROLLING THE FREQUENCY OF A HIGH FREQUENCY GENERATOR
The output of an oscillator is applied to two transmission paths having equal electrical and physical lengths. The first path contains a resonator of a selected frequency; the second path an I. F....
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3534284 |
AUTOMATIC PHASE-LOCKING CIRCUIT
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3529259 |
DISCRIMINATOR SYSTEM UTILIZING A SINGLE MODE CAVITY RESONATOR
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3528033 |
SWEEP RATE CONTROLLED FREQUENCY SWEPT OSCILLATOR
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3480866 |
FREQUENCY CONTROL SWITCHING SYSTEM
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3479600 |
AUTOMATIC FREQUENCY CONTROL SYSTEM FOR CONTROLLING THE FREQUENCY OF THE LOCAL OSCILLATOR USED IN A DIFFERENTIAL PHASE MODULATED PCM RECEIVER
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3457521 |
AUTOMATIC FREQUENCY CONTROL CIRCUIT WITH PHASE DISCRIMINATOR
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3418595 |
Automatic frequency control system
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