Method and system for sending large numbers of cmos control signals into a separate quiet analog power domain

Abstract

A CMOS signal transmission system for sending a large amount of CMOS signals into a separate quiet analog power domain. Transmission system comprises a converter sub-system which provides at least another device stage through which noise in the CMOS signals must flow and be attenuated to provide converted CMOS signals and a multiplexer coupled to the converter wherein the multiplexer receives converted CMOS signals from the converter sub-system and also receives delayed path control signals. The converter comprises a constant current source for providing a high level voltage reference and a constant current, two complimentary pass gates, and two sets of components for providing paths to ground from the constant current source through the two complimentary pass gates. When CMOS input signal is high and Complimentary CMOS input signal is low, the pass gate comprising transistors T and T is on and transistors T and T are off and connection BSEL is pulled high turning on bipolar transistor Q allowing current to flow through Q and pulling net SB low and selecting inputs B , B to be transferred to ECL Differential Outputs. Likewise, when CMOS input signal is low and Complimentary CMOS input signal is high, pass gate comprising transistors T and T is on, and transistors T and T are off, and connection ASEL is pulled high turning on bipolar transistor Q allowing current to flow through Q and pulling net SA low and selecting inputs A , A to be transferred to ECL Differential Outputs.