Patent ID: 8599962

Claim:
An apparatus comprising: a filter configured to (i) receive an input signal, and (ii) based on coefficients of a polynomial, filter the input signal to generate a first digital signal; a transmitter configured to transmit an analog signal according to a gain of the transmitter, wherein the analog signal is based on the first digital signal; a receiver configured to (i) receive the analog signal transmitted by the transmitter, and (ii) output a second digital signal based on the analog signal received by the receiver; a measurement module configured to, based on the second digital signal, generate a linearity signal indicative of a linearity of the transmitter; and a gain module configured to (i) receive the linearity signal, and (ii) control the gain of the transmitter according to the linearity signal, wherein the gain module is configured to set the gain of the transmitter to a predetermined value to maintain the coefficients of the polynomial within respective predetermined ranges.