Patent ID: 7595691

Claim:
A pre-amplifier for a receiver, the pre-amplifier comprising: a first input operational amplifier and a second input operational amplifier for amplifying an input differential voltage pair to respectively output a first differential voltage pair and a second differential voltage pair, the transistors in the first and the second input operational amplifiers being complementary; an output module comprising: a first output operational amplifier for amplifying the first differential voltage pair to output one of the amplified first differential voltage pair, the outputted one being defined as a first output amplified voltage; a second output operational amplifier for amplifying the second differential voltage pair to output one of the amplified second differential voltage pair, the outputted one being defined as a second output amplified voltage, the transistors in the first input and the first output operational amplifiers being complementary, the transistors in the second input and the second output operational amplifiers being complementary; and an inverter for pulling an output voltage high or low based on the first and the second output amplified voltages; a first feedforward circuit for pulling the first differential voltage pair up when the common-mode voltage of the input differential voltage pair is higher than a first threshold, such that the first output amplifier is not disabled; and a second feedforward circuit for pulling the second differential voltage pair down when the common-mode voltage of the input differential voltage pair is lower than a second threshold, such that the second output amplifier is not disabled.