H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/53, 333/75
H03H 11/12 (2006.01) H03L 7/08 (2006.01) H04B 1/26 (2006.01)
Patent
CA 1245309
ABSTRACT OF THE DISCLOSURE A tuning control apparatus is provided with a phase lock loop including a local oscillator providing a signal varying at a frequency determined by a voltage variable capacitor, a low-pass filter providing a control voltage to the voltage variable capacitor, a frequency dividing circuit for dividing the frequency of the signal provided by the local oscillator and a phase comparator for comparing the phase of the divided frequency signal with a reference and for providing a signal to the low- pass filter. The low-pass filter includes a series resistor in a signal path for the phase comparator signal and a capacitor connected between the series resistor and ground. The time constant of the filter can be changed in response to the signal through the series resistor by a further resistor series connected with said series resistor, a diode which turns on in response to a predetermined voltage and off in response to a voltage below the predetermined value. The diode is connected across the further resistor for changing the time constant filter.
548540
G. Ronald Bell & Associates
Mitsubishi Denki Kabushiki Kaisha
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