System characteristic identification systems and methods

摘要

A digital to analog converter samples a first digital signal to produce first digital values and that outputs a first analog signal corresponding to the first digital values to a system. A mixer mixes a second analog signal output by the system in response to the first analog signal with a periodic signal to produce a mixed signal. An integrator integrates the mixed signal and generates an integrator signal based on the integration. An analog to digital converter converts samples of the integrator signal into second digital values. A correction module generates third digital values based on the first digital values and corrections for the integrator and the DAC. A correction determination module determines coefficients based on pairs of ones of the third digital values and ones of the second digital values. A pre-distortion module pre-distorts a second digital signal based on the coefficients to produce the first digital signal.

主权项

1. A characteristic identification system, comprising:
a digital to analog converter (DAC) that samples a first digital signal at a first predetermined rate to produce first digital values and that outputs a first analog signal corresponding to the first digital values to a system of one or more components that is to be characterized; a mixer that receives a second analog signal output by the system in response to the first analog signal and that mixes the second analog signal with a periodic signal to produce a mixed signal; an integrator that integrates the mixed signal during successive predetermined periods and that generates an integrator signal based on the integration; an analog to digital converter (ADC) that samples the integrator signal at a second predetermined rate corresponding to the predetermined periods and that converts the samples into second digital values, wherein the second predetermined rate is less than the first predetermined rate; a correction module that determines corrections for the integrator and the DAC and that generates third digital values based on the first digital values and the corrections, respectively; a correction determination module that pairs ones of the third digital values with ones of the second digital values, respectively, and that determines coefficients for the system based on the pairs; and a pre-distortion module that pre-distorts a second digital signal based on the coefficients for the system to produce the first digital signal.