Patent ID: 7358780
Filing Date: 2008-04-15
Classification: H03F,H04L

Abstract:
1. A LVDS (Low Voltage Differential Signal) driver with a high PSRR (Power Supply Rejection Ration), comprising: a first current source for providing a first working current; a switch unit having a first signal node and a second signal node for receiving the first working current and outputting output current at the first signal node and the second signal node, the current directions of the output current being controlled by a first input signal and a second input signal; a second current source couple to the switch unit and a low working power voltage; a common mode feedback unit for generating a common mode control signal according to voltages at the first signal node and the second signal node of the switch unit; a common mode resistance unit connected in parallel with the second current source and having a resistance value controlled by the common mode control signal; and a compensation unit, which is connected in parallel with the second current source, for compensating a current variation of the first current source caused by a power noise.