Patent ID: 7382181

Claim:
A tunable GMC filter, comprising: a transconductance element; an attenuator connected in a negative feedback loop with the transconductance element, wherein the transconductance element and the attenuator form an oscillation circuit having an oscillation frequency; an input on the oscillation circuit for receiving a tuning current for tuning the oscillation frequency of the transconductance element to a predetermined frequency; a comparator interfacing an output of the transconductance element and configured for driving the output of the transconductance element between a first level and a second level, and a multiplexer selectively interfacing an output of the comparator or an external data input and configured for transitioning the transconductance element from a first mode to allow oscillation in the negative feedback loop to a second mode wherein the negative feedback loop is broken and data is received at the attenuator in a data mode wherein the transconductance element transfers data.