Patent ID: 6590447
Filing Date: 2003-07-08
Classification: H03F

Abstract:
A bridge amplifier comprising:a first input node connectable to a power source having an input voltage; a second input node connectable to a control source having a control voltage; first and second output nodes; a first amplifier module having a gain and coupled between the first and second input nodes and between the first and second output nodes, wherein the first amplifier module is configured to compare a voltage differential between the first and second output nodes to the control voltage and provide an output voltage at the first output node necessary to maintain the voltage differential at a level substantially equal to a product of the control voltage multiplied by the gain; and a second amplifier module coupled to the first input node and between the first and second output nodes, wherein the second amplifier module is configured to determine a midpoint voltage level of the input voltage and a midpoint level of the voltage differential and provide an output voltage at the second output node necessary to maintain the voltage differential midpoint level at a level substantially equal to the input voltage midpoint level.