Arrangement useful in a phase locked loop tuning control system

Details Arrangement useful in a phase locked loop tuning control system Arrangement useful in a phase locked loop tuning control system

1982-02-26

1984-01-17

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455182, 455183, H04B 126

Patent

active

044267347

ABSTRACT:
In a phase locked loop tuning system including a phase comparator for producing a pulse type error signal representing the phase and frequency deviation between a frequency divided version of the local oscillator signal and a reference frequency signal and a mode switch for coupling the error signal to an integrator for developing a tuning voltage when a channel is initially selected and thereafter for coupling an AFT voltage to the integrator to modity the tuning voltage to correct for a frequency deviation of the IF signal, switching duty cycle control apparatus is provided for controlling the duty cycle at which the AFT voltage is coupled to the integrator in accordance with the selected channel and more particularly with its band to make the AFT response more consistent throughout the tuning range.

REFERENCES:
patent: 2872579 (1959-02-01), Kihn
patent: 3631347 (1971-12-01), Chipman
patent: 3814843 (1974-06-01), Kruszewski
patent: 4031549 (1977-06-01), Rast
patent: 4122493 (1978-10-01), Arumugham et al.
patent: 4125863 (1978-11-01), Arumugham
patent: 4142157 (1979-02-01), Tanaka
patent: 4156199 (1979-05-01), Hendrickson et al.
patent: 4184121 (1980-01-01), Tanaka
patent: 4245351 (1981-01-01), Tults
"DIGITALES PROGRAMMSPEICHER-SYSTEM" by Friedrich Timmermann, Funkschau 1977, Heft 17, (with partial translation).

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