Patent ID: 7595666

Claim:
A double sampled multiple-input amplifier circuit comprising: a first amplifier section for a first sampled differential input; a second amplifier section for a second sampled differential input, said first sampled differential input and said second sampled differential input being sampled at different times; and a bias switching architecture coupled to said first amplifier section and to said second amplifier section, said bias switching architecture being configured to alternate between a first bias state and a second bias state for said amplifier circuit; wherein said first bias state corresponds to activation of said first amplifier section and partial activation of said second amplifier section; said second bias state corresponds to activation of said second amplifier section and partial activation of said first amplifier section; said bias switching architecture comprises: a first bias transistor having a drain coupled to said first amplifier section, a gate, and a source coupled to ground; a second bias transistor having a drain coupled to said second amplifier section, a gate, and a source coupled to ground; a third bias transistor having a drain coupled to said first amplifier section, a gate, and a source coupled to ground, said third bias transistor being connected in parallel with said first bias transistor; and a fourth bias transistor having a drain coupled to said second amplifier section, a gate, and a source coupled to ground, said fourth bias transistor being connected in parallel with said second bias transistor; said gate of said third bias transistor receives a first bias control signal, said gate of said fourth bias transistor receives a second bias control signal, said gate of said first bias transistor receives a common bias control signal, and said gate of said second bias transistor receives said common bias control signal; and said first bias control signal, said second bias control signal, and said common bias control signal are different and distinct signals.