Low-distortion differential circuit
AssigneeSequoia Communications
InventorJohn Groe
Life of this patent
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Abstract
A differential feedback system that minimizes even order distortion of a differential circuit. The feedback system includes a feedback circuit for use with a differential circuit to reduce even-order distortion and dc offset of a difference output signal produced by the differential circuit. The feedback circuit includes an integrator coupled to receive the difference output signal from the differential circuit and produce an integrator output signal. The feedback circuit also includes a control circuit coupled to the integrator to receive the integrator output signal to produce a control signal that is coupled to the differential circuit, wherein the control signal controls the differential circuit to reduce the even-order distortion and the DC offset.
Claims11
1-2. (canceled)
A feedback circuit for use with a differential circuit, the feedback circuit comprising:
- a comparator configured to receive differential output signals produced by the differential circuit and produce a comparator output signal;
- and
- a controller that receives the comparator output signal and produces a control signal that is coupled to the differential circuit, wherein the control signal controls the differential circuit to reduce even-order distortion.
A method for operating a feedback circuit that is coupled to a differential circuit to reduce even-order distortion associated with a differential circuit, and the method comprises:
- adjusting the feedback circuit to compensate for output mismatch effects of the differential circuit;
- adjusting the feedback circuit to reduce input offset effects of the differential circuit;
- and
- adjusting the feedback circuit to set a gain factor of the differential circuit.
Dependencies are inferred from the claim text.