Patent ID: 9634685
Date: 2017-04-25
CPC Classifications: H03F,H03M

Claim:
1. A telescopic amplifier, comprising: an input stage comprising a first input transistor having a gate terminal coupled to a positive input terminal, and a second input transistor having a gate terminal coupled to a complementary input terminal; an output stage comprising a first output transistor having a source coupled to a drain of the first input transistor and having a first current source coupled to a drain of the first output transistor, and a second output transistor having a source coupled to a drain of the second input transistor, and having a second current source coupled to a drain of the second output transistor, a first output terminal coupled to the drain of the first output transistor, and a second output terminal coupled to the drain of the second output transistor, the first and second output transistor each having gates coupled to a bias voltage terminal; a tail current transistor having a drain coupled to a common source node coupled to the source of each of the first and second input transistors, having a source coupled to a ground potential, and having a gate terminal coupled to a tail gate node; a common mode feedback circuit having a first feedback input coupled to the first output terminal, and a second feedback input coupled to the second output terminal, the common mode feedback circuit further having a common mode reference signal input, and a common mode output; and a resistor coupled between the common mode output and the tail gate node.