Oscillators – Automatic frequency stabilization using a phase or frequency... – Oscillator with distributed parameter-type discriminator
Patent
1997-09-19
1999-09-07
Kinkead, Arnold
Oscillators
Automatic frequency stabilization using a phase or frequency...
Oscillator with distributed parameter-type discriminator
331175, 331 1R, 331 10, 331 32, 331 16, 327105, H03L 700, H03L 706
Patent
active
059492902
ABSTRACT:
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 1-port tunable delay line discriminator reduces the phase noise generated by VCO's to approximately 105 dBc/Hz at 10 kHz, to better than 120 dBc/Hz at 100 kHz. The invention additionally reduces post tuning drift to less than 10 kHz after one microsecond. A secondary feedback loop, such as a conventional phase lock loop, can be incorporated into the invented FLL for providing phase and frequency coherency. The invention is formed by coupling a voltage controlled oscillator source (VCO) to a microwave signal detector and to an open ended delay line. When a microwave signal generated by the VCO reaches an end of the open ended delay line, a majority of the signal is reflected back along the line. When the reflected signal reaches a beginning of the delay line a standing wave (SW) signal is created were the microwave signal entering the delay line interferes with the reflected signal returning from the open end of the delay line. As the frequency of the VCO is tuned, the phase of the SW changes. A variable capacitance can be added to the open end of the delay line for adjusting the phase of the delay line signal, causing the SW to tune in delay time.
REFERENCES:
patent: 3614649 (1971-10-01), Gerig
Aiello Jeffrey P.
Kinkead Arnold
Leary James J.
Titus Carol D.
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