Patent ID: 7068092
Filing Date: 2006-06-27
Classification: G09G

Abstract:
1. A common voltage source IC device, comprising: an operational amplifier including an inverting input and a non-inverting input; a push-pull circuit receiving an output signal from the operational amplifier and outputting a common voltage to a common voltage terminal; an inverting resistor receiving a control signal and connected to the inverting input; a feedback resistor connected to the common voltage terminal and the inverting input; a capacitor connected to the common voltage terminal and the inverting input; a first switching resistor connected to the inverting input and a first switching transistor, the first switching transistor receiving a first switching signal and connected to the common voltage terminal; a driving resistor receiving a drive voltage and connected to the non-inverting input; a variable resistor connected to the non-inverting input and a ground source; and a second switching resistor connected to the non-inverting input and a second switching transistor, the second switching transistor receiving a second switching signal and connected to the ground source.