Patent ID: 7808767
Filing Date: 2010-10-05
Classification: G05F

Abstract:
1. A control unit, comprising: an input terminal and an output terminal for a signal to be controlled; a control input terminal and a control output terminal for a control signal; variable capacitors in a bridge configuration connected between the input terminal and the control input terminal, between the input terminal and the control output terminal, between the control input terminal and the output terminal, and between the control output terminal and the output terminal, capacitances thereof being changed by the control signal; and a differential signal-controlled power source in which the control signal is applied across the control input terminal and the control output terminal in a differential mode with a pair of signals having the same absolute value and mutually opposing polarities, wherein voltage or current of the signal to be controlled is controlled by the control signal changing the capacitances of the variable capacitors in the bridge configuration.