Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1984-07-06
1986-05-20
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 25, 331DIG2, H03L 706
Patent
active
045904405
ABSTRACT:
A phase locked loop circuit (16) includes means to eliminate harmonic frequency locking. The phase locked loop includes a voltage controlled oscillator (1) which provides an output signal (V.sub.out) which is compared with the input signal (V.sub.in) by a phase detector (4). The output signal from the phase detector is integrated and the output signal of the integrator (7) is placed on the control input lead of the voltage controlled oscillator. The output signal of the voltage controlled oscillator is provided to a frequency detector (14, 17) which determines if the output frequency is within a predefined range. If the output frequency is above the predetermined range, a limiter circuit (15) provides a low voltage output signal to the control input lead of the VCO in order to pull the input voltage of the VCO to a voltage which corresponds with the appropriate operating range of the phase locked loop. If the output frequency of voltage controlled oscillator is below the predefined frequency range, the limiter circuit provides a high voltage output signal to the control input lead of the VCO in order to pull the input voltage of the voltage controlled oscillator to a voltage which corresponds with the proper operating frequency range of the phase locked loop.
REFERENCES:
patent: 3959737 (1976-05-01), Tanis
patent: 4258333 (1981-03-01), Demuliere et al.
patent: 4388596 (1983-06-01), Yamashita
patent: 4510461 (1985-04-01), Dickes et al.
Helszajn, J.; "YIG Resonators and Systems", Electronic Engineering, Dec. 1983, pp. 47-56.
Haque Yusuf A.
Takla Ashraf K.
American Microsystems, Inc.
Caserza Steven F.
LaRoche Eugene R.
Leeds Kenneth E.
MacPherson Alan H.
LandOfFree
Phase locked loop with high and/or low frequency limit detectors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Phase locked loop with high and/or low frequency limit detectors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase locked loop with high and/or low frequency limit detectors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2110909