Patent ID: 7463086

Claim:
A tunable filter, comprising: a band pass filter having a plurality of transconductors and a plurality of capacitors coupled to said plurality of transconductors, said band pass filter operating at a center frequency; a plurality of switches coupled to said band pass filter, said plurality of switches capable of operating in a first state and a second state; a control logic for controlling said plurality of switches; a comparator coupled to said band pass filter and said control logic; and a first low pass filter for filtering a reference signal and delivering said filtered reference signal to said band pass filter, when said plurality of switches are in said first state, said tunable filter is configured as said band pass filter, when said plurality of switches are in said second state, said tunable filter is configured as a tuning device for tuning said center frequency to a predetermined center frequency, said control logic selecting at least one transconductor from said plurality of transconductors and a capacitor from said plurality of capacitors to form a tuning integrator, said at least one transconductor and said capacitor determining said center frequency of said band pass filter, and said control logic selecting a transconductor from said plurality of transconductors and a capacitor from said plurality of capacitors to form said first low pass filter.