Patent ID: 8849227

Claim:
A method for controlling the second order intercept point in a receiver, comprising: generating an amplitude modulated test tone based at least in part on a pseudo-random noise sequence; causing the test tone to be received by a receiver; applying a first gate bias voltage to a mixer in the receiver; producing a baseband output using the mixer in the receiver in response to the test tone and the first gate bias voltage; producing a sign bit by performing a correlation on the baseband output against the pseudo-random noise sequence; determining whether the sign bit is equal to zero; generating a first voltage step based on the determination; generating a second gate bias voltage by combining the first gate bias voltage and the first voltage step; applying the second gate bias voltage to the mixer; generating a second voltage step based on the first voltage step; determining whether the second voltage step is less than a predetermined threshold; and in response to determining that the second voltage step is less than the predetermined threshold, determining that the second-order intercept point of the receiver converges to an optimal value.