Receiver with improved lock-up time and high tuning stability

Details Receiver with improved lock-up time and high tuning stability Receiver with improved lock-up time and high tuning stability

1996-08-16

1999-12-21

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4551922, 455260, 455265, 331 11, H04B 116

Patent

active

060060786

ABSTRACT:
A receiver has an oscillator for generating an oscillating signal at an oscillating frequency in accordance with an oscillation control signal, and receives a radio signal at a tuning frequency corresponding to the oscillating signal to demodulate the received radio signal. The receiver further includes a first frequency control loop system for generating a first control signal indicative of the difference in phase between a comparison signal generated by dividing the oscillating signal on the basis of the information on a channel selection frequency and a reference signal, and a second frequency control loop system for generating a second control signal indicative of a frequency difference between the oscillating frequency of the oscillating signal and the channel selection frequency. Either the first control signal or the second control signal is selectively supplied to the oscillator as an oscillation control signal.

REFERENCES:
patent: 4280104 (1981-07-01), Rzeszewski
patent: 4365349 (1982-12-01), Ogita et al.
patent: 4607393 (1986-08-01), Nokde et al.
patent: 5150078 (1992-09-01), Yang et al.
patent: 5361407 (1994-11-01), Swada et al.
patent: 5424687 (1995-06-01), Fukuda
patent: 5548811 (1996-08-01), Kumagai et al.
Gardner, Floyd M., Phaselock Techniques, John Wiley & Sons, N.Y. u.a., 2nd Ed., 1979, pp. 84-85.

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