Patent ID: 7375586

Claim:
A gain amplifier to amplify an input signal and generate a high gain output signal on an output terminal, said gain amplifier comprising: a first amplification stage receiving said input signal and generating an output; a second amplification stage receiving said output of said first amplification stage on an input terminal and generating an amplified output on said output terminal; and a booster amplifier circuit causing the gain of said second amplification stage to be enhanced and to cause said high gain output signal to be generated, said booster amplifier circuit comprising: a first transistor receiving a bias signal on a gate terminal, a source terminal of said first transistor being coupled to said output terminal and said output of said first amplification stage, a drain terminal of said first transistor being coupled to said second amplification stage; a load connected to said drain terminal of said first transistor and a current source providing bias current to said first transistor.