Patent ID: 9712159
Date: 2017-07-18
CPC Classifications: H03K

Claim:
1. A differential driving circuit, comprising: a source current source; a sink current source; an H-bridge circuit that is connected to the source current source and the sink current source, that has a first output terminal and a second output terminal, and that generates differential output from the first output terminal and the second output terminal; an error detector unit that adjusts a common mode voltage at the first output terminal and the second output terminal of the H-bridge circuit; and a circuit network configured by resistors and capacitors connected to the first output terminal and the second output terminal of the H-bridge circuit; wherein the circuit network is configured such that one terminal of a first resistor and one terminal of a first capacitor are connected to the first output terminal of the H-bridge circuit, one terminal of a second resistor and one terminal of a second capacitor are connected to the second output terminal of the H-bridge circuit, one terminal of a third resistor is connected to the other terminal of the first resistor and the other terminal of the second resistor, one terminal of a third capacitor is connected to the other terminal of the first capacitor, the other terminal of the second capacitor, and the other terminal of the third resistor, and the other terminal of the third capacitor is connected to ground, and the error detector unit is configured to control at least one of the source current source and the sink current source, based on a voltage generated at a node where the other terminal of the third resistor and the one terminal of the third capacitor are connected to each other, and a reference voltage, wherein the error detector unit includes a differential amplifier having a first input terminal to which the reference voltage is input and a second input terminal to which the voltage generated at the node where the other terminal of the third resistor and the third capacitor are connected to each other is input, and a voltage source, and output of the differential amplifier is connected to a control terminal of one of the source current source and the sink current source, and output of the voltage source is connected to the control terminal of the other of the source current source and the sink current source.