Patent ID: 6342793
Filing Date: 2002-01-29
Classification: H03K

Abstract:
A converter system for use in a transmission system having a multiplexer for sending a large number of CMOS signals into a quiet analog power domain wherein the converter circuit is coupled to the multiplexer comprising:a constant current source for providing a high level voltage reference, one complementary pass gate coupled on one side of the constant current source wherein the one complementary pass gate acts as one complementary switch wherein a first CMOS signal input and a second CMOS signal input that is complementary to the first CMOS signal input are provided to the one complementary pass gate and wherein the one complementary pass gate is closed to provide the one complementary switch as closed and a first output of the CMOS signals is selected through the one complementary pass gate when the first CMOS signal input is high and the second CMOS signal input is low, one set of components coupled to the one complementary pass gate wherein the one set of components provide a path to ground from the constant current source through the one complementary pass gate, the one set of components for providing the one path to ground further comprising two diode components and a resistor wherein an end of one of the two diodes is coupled to the one complementary pass gate and wherein another end of the one of the two diodes is coupled to an end of another of the two diodes and another end of the another of the two diodes is coupled to ground and wherein one end of the resistor is coupled to the end of the another of the two diodes and another end of the resistor is coupled to ground, another complementary pass gate coupled on another side of the constant current source wherein the another complementary pass gate acts as another complementary switch wherein the another complementary pass gate is complementary to the one complementary pass gate and wherein the second CMOS signal input and the first CMOS signal input are provided to the another complementary pass gate and wherein the another complementary pass gate is closed to provide the another complementary switch as closed and a second output of the CMOS signals is selected through the another complementary pass gate when the first CMOS signal input is low and the second CMOS signal input is high, and another set of components coupled to the another complementary pass gate wherein the another set of components provide another path to ground from the constant current source through the another complementary pass gate.