Patent ID: 6897799

Claim:
A one-bit return-to-zero digital-to-analog converter, comprising: a current source, configured to draw an approximately constant current from a voltage source; a first differential switch, controlled by clock signals to switch current flowing through the current source back and forth between a data signal path that is active during an enabled phase of the clock signals, and a current parking path that is active during a return-to-zero phase of the clock signals; a second differential switch, connected in the data signal path and controlled by data input signals to switch current along one of two alternate paths in the data signal path, to produce data output signals corresponding to the data input signals during the enabled phase of the clock signals; and a current parking circuit, connected in the current parking path and activated by the first differential switch in the return-to-zero phase of the clock signals, wherein the current parking circuit is coupled directly to the voltage source independently of the data signal path.