Device and method for controlling frequency characteristic of a filter

A receiver comprising:

• a radio section for amplifying a received signal to thereby output an amplified signal;
• a filter having a preselected frequency characteristic;
• a current source for feeding a first control signal to said filter;
• an integrator for outputting a second control signal corresponding to said amplified signal;
• a voltage-to-current converter for outputting a third control signal corresponding to a difference between said second control signal and a preselected reference value;
• and
• a controller for controlling the preselected frequency characteristic of said filter in accordance with the first control signal and the third control signal.

A device for controlling frequency characteristic of a filter, comprising:

• a filter having a preselected frequency characteristic;
• a current source for feeding a first control signal to said filter;
• an integrator for outputting a second control signal corresponding to an output signal of said filter;
• a voltage-to-current converter for outputting a third control signal corresponding to a difference between the second control signal and a preselected reference value;
• and
• a controller for controlling the preselected frequency characteristic of said filter in accordance with the first control signal and the third control signal.