Patent ID: 6798237
Filing Date: 2004-09-28
Classification: H04L

Abstract:
An integrated circuit, comprising:a first transistor; an analog-to-digital converter comprising comparators that compare a voltage at a terminal of the first transistor to a series of resistance values to gene rate 2N output signals in response to the voltage at the terminal of the first transistor; a digital encoder circuit coupled to receive the 2N output signals of the comparators, the digital encode circuit encoding the 2N output signals of the comparators into N digital signals that represent an N-bit binary value, the binary value indicating how many of the 2N output signals of the comparators are HIGH; and an impedance matching circuit coupled to receive the N digital signals generated by the digital encoder circuit, wherein the impedance matching circuit comprises a plurality of second transistors coupled in parallel that are turned ON or OFF in response to the N digital signals.