Patent ID: 8718584
Filing Date: 2014-05-06
Classification: H03D,H04B,H04L

Abstract:
1. A programmable receiver, the receiver comprising: a radio frequency (RF) input configured to receive an RF signal; a first frequency conversion module coupled to the RF input; a second frequency conversion module coupled to the RF input; a programmable RF local oscillator (LO) selectively tunable to an RF frequency; a first phase shift module coupled to the programmable RF LO and configured to generate an in-phase RF LO signal and a quadrature LO signal, and configured to couple the in-phase LO signal to the first frequency conversion module and couple the quadrature LO signal to the second frequency conversion module in order to generate in-phase and quadrature baseband signals, respectively, using the first and second frequency conversion modules; a first baseband filter coupled to the first frequency conversion module and configured to filter the in-phase baseband signal; a second baseband filter coupled to the second frequency conversion module and configured to filter the quadrature baseband signal; a DC offset cancellation module configured to remove substantially a DC offset error from the in-phase baseband signal and the quadrature baseband signal; wherein the DC offset cancellation module comprises: a static DC offset correction portion configured to substantially compensate for static DC offset errors in the in-phase and quadrature baseband signals; and a dynamic DC offset correction portion configured to substantially compensate for dynamic DC offset errors in the in-phase and quadrature baseband signals; a third frequency conversion module coupled to the first baseband filter; a fourth frequency conversion module coupled to the second baseband filter; a programmable IF LO selectively tunable to an IF frequency; a second phase shift module coupled to the programmable IF LO and configured to generate an in-phase IF LO signal and a quadrature IF LO signal, and configured to couple the in-phase IF LO signal to the third frequency conversion module and couple the quadrature IF LO signal to the fourth frequency conversion module in order to upconvert the in-phase and quadrature baseband signals to an in-phase output IF signal and a quadrature output IF signal; and a signal combiner coupled to the first and second frequency conversion modules and configured to combine the in-phase output IF signal and the quadrature output IF signal into a composite output IF signal, wherein the dynamic DC offset correction portion comprises a frequency upconverter configured to upconvert the in-phase and quadrature baseband signals to IF signals.