Patent ID: 7230482

Claim:
A common mode control circuit for at least one pair of amplifiers self-configuring in a bridge configuration for driving a first load, and in a single-ended configuration using one of the amplifiers for driving the first load based upon a level of a differential input signal, the common mode control circuit comprising: a configuring switch; a common mode feedback differential amplifier for the at least one of the pair of amplifiers and having a first input connected to a common mode control node of the at least one pair of amplifiers, and a second input that is switched by said configuring switch for short-circuiting the first and second inputs; a storage capacitor connected between a reference potential and one of the first and second inputs of said common mode feedback differential amplifier; and a reference potential circuit for generating the reference potential as a saturated replica of the differential input signal for the amplifier that saturates when switching to the bridge configuration.