Patent ID: 8487697

Claim:
A fully differential amplifier with automatic offset voltage zeroing, comprising: first and second dynamically switched current mirrors, each toggling operation between an autozeroing phase in which it mirrors a first current level indicative of a level of a first input terminal to provide a mirrored current, and an output phase in which it applies a difference current to a common output node, wherein said difference current comprises a difference between said mirrored current and a second current level indicative of level of a second input terminal; wherein said first and second dynamically switched current mirrors operate out of phase with respect to each other during at least one cycle of a clock signal having a first period and a second period, wherein said first dynamically switched current mirror operates in its autozeroing phase while said second dynamically switched current mirror operates in its output phase during said first period, and wherein said second dynamically switched current mirror operates in its autozeroing phase while said first dynamically switched current mirror operates in its output phase during said second period; and an output circuit which develops a first output signal on a first output terminal at a first polarity based on a level of said common output node, and which develops a second output signal on a second output terminal at a second polarity based on a level of said common output node.