Patent ID: 7064610

Claim:
A differential amplifier, comprising: a differential input capable of receiving a differential signal; a first differential pair coupled to said differential input; a second differential pair, coupled to said differential input, and connected in parallel with said first differential pair at a differential output; a differential offset circuit, coupled between said differential input and said second differential pair, and capable of level shifting said differential signal from a first level to a second level, said differential offset circuit having a first source follower coupled between a first input terminal of said differential input and a first amplifying transistor of said second differential pair and a second source follower coupled between a second input terminal of said differential input and a second amplifying transistor of said second differential pair; and a differential switch circuit, coupled to said first differential pair and said second differential pair, and capable of controlling a first current flow to said first differential pair and a second current flow to said second differential pair; wherein said differential output is capable of receiving a differential voltage output signal.