Device and method for controlling frequency characteristic of a

Details Device and method for controlling frequency characteristic of a Device and method for controlling frequency characteristic of a

1998-02-27

2000-09-19

Bost, Dwayne D.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455213, 327553, H04B 110

Patent

active

061224960

ABSTRACT:
When the frequency band of an intermediate frequency (IF) signal input to a filter rises due to temperature variation, the center voltage corresponding to the IF signal also rises. As a result, a difference occurs between the center voltage and a preselected reference voltage. An output current produced by converting the difference is so output as to increase a control current, thereby shifting the frequency characteristic of the filter to the higher frequency side. When the frequency band of the IF signal falls due to temperature variation, the center voltage also falls. The resulting difference between the center voltage and the reference voltage is also transformed to an output current. This output current is so output as to reduce the control current with the result that the frequency characteristic of the filter is shifted to the lower frequency side.

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European Search Report, 98103725.2-2211, Aug. 10, 1999.

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