Systems and method for automatic quadrature phase imbalance compensation using a delay locked loop
AssigneeConexant Systems, Inc.
InventorsRay Rosik, Mark Santini, Weinan Gao
Life of this patent
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Abstract
An automatic quadrature phase compensation system comprises an on-chip analog phase sense circuit capable of detecting small differences in quadrature phase error and providing a corresponding DC voltage, a voltage-controlled or programmable phase delay circuit to implement quadrature phase error correction, and a feedback system or compensation engine used to process the sensed error voltage and apply a corresponding correction signal to the adjustable phase delay.
Claims20
A quadrature phase compensation system, comprising:
- a voltage-controlled, phase delay circuit configured to implement quadrature phase error correction on quadrature signals generated by a quadrature signal generator;
- an analog phase sense circuit coupled with the voltage controlled, phase delay circuit, the analog phase sense circuit configured to receive the quadrature signals from the voltage-controlled, phase delay circuit, sense a phase error related to the quadrature signals, and produce a DC voltage that is representative of the sensed phase error;
- and
- a feedback system coupled between the analog phase sense circuit and the voltage-controlled, phase delay circuit, the feedback system configured to process the DC voltage and apply a corresponding correction signal to the voltage-controlled, phase delay circuit.
The quadrature phase compensation system of claim I, wherein the voltage-controlled, phase delay circuit is configured to adjust the phase of the quadrature phase signal of the quadrature signals in order to implement the quadrature phase error correction.
A receiver, comprising:
- a quadrature signal generator configured to generate in-phase and quadrature signals;
- an in-phase VCDL coupled with the quadrature signal generator and configured to implement quadrature phase error correction on the in-phase signal generated by the quadrature signal generator;
- a quadrature phase VCDL coupled with the quadrature signal generator and configured to implement quadrature phase error correction on the quadrature phase signal generated by the quadrature signal generator;
- an analog sense circuit coupled with the in-phase and quadrature phase VCDLs, the analog sense circuit configured to receive the in-phase and quadrature phase signals from the VCDLs, sense a phase error related to the signals, and produce a DC voltage that is representative of the sensed phase error;
- and
- a feedback system coupled between the analog sense circuit and at least on of the VCDLs, the feedback system configured to process the DC voltage and apply a corresponding correction signal to at least one of the VCDLs.
Dependencies are inferred from the claim text.