Patent ID: 7196573

Claim:
A differential, tunable circuit operable to create a pair of complex poles the circuit comprising: a first transistor with a gate, a source and a drain; a first tuning capacitor wherein the first tuning capacitor is electrically coupled between the gate of the first transistor and the source of the first transistor; a first resistor, wherein the first resistor is electrically coupled to the gate of the first transistor, and wherein a first input is electrically coupled to the gate of the first transistor via the first resistor; a second transistor with a gate, a source and a drain; a second tuning capacitor, wherein the second tuning capacitor is electrically coupled between the gate of the second transistor and the source of the second transistor; and a second resistor, wherein the second resistor is electrically coupled to the gate of the second transistor, and wherein a second input is electrically coupled to the gate of the second transistor via the second resistor.