Patent ID: 7675330
Filing Date: 2010-03-09
Classification: H03K,H04L

Abstract:
1. A low power differential signaling transmitter, comprising: a switchable current source apparatus, used for receiving a first input voltage and a second input voltage, and generating a plurality of reference currents according to the first input voltage and the second input voltage; and a differential signaling generator, coupled to the switchable current source apparatus, comprising: a plurality of first transistors; a plurality of second transistors; a first output voltage terminal; a second output voltage terminal; and wherein on or off states of the first transistors and the second transistors are controlled by the reference currents; the first output voltage terminal is adapted for outputting a first output voltage; the second output voltage terminal is adapted for outputting a second output voltage; and the first output voltage and the second output voltage are determined according to the on or off states of the first and second transistors, wherein the switchable current source apparatus comprises: a first switchable current source module, used for receiving the first and the second input voltages, and generating a first and a second reference currents according to the first and second input voltages; and a second switchable current source module, used for receiving the first and the second input voltages, and generating a third and a fourth reference currents according to the first and second input voltage, wherein the first switchable current source module comprises: