Patent ID: 7889008

Claim:
A programmable gain MOS amplifier for outputting an amplified signal at a first end of a load with a programmable gain, the programmable gain MOS amplifier comprising: a first gain provider for providing a first predetermined gain, comprising: an input end for receiving an input signal; and an output end; and a first gain tuner for adjusting the first predetermined gain, comprising: a gain enabling module, comprising: a first end coupled to the first end of the load; and a second end coupled to the output end of the first gain provider; and a gain decreasing module, comprising: a first MOS transistor, comprising: a control end for receiving a first controlling signal; a first end coupled to a second end of the load; and a second end coupled to the output end of the first gain provider; and a second MOS transistor, comprising: a control end for receiving a third controlling signal; a first end coupled to the second end of the load; and a second end coupled to the output end of the MOS transistor of the first gain provider.