Reduced-power dissipation for circuits handling differential pseudo-differential signals

摘要

In an example, a differential amplifier is disclosed that is configured to realize low noise with decreased overall system current. The differential amplifier may include a first amplifier stage and a second amplifier stage arranged in series, wherein a pull-up current iH flowing as a single bias current iB=iH flows into the first stage. A single pull-down current iT sources to ground from the second stage, wherein iH=iT=iB substantially. In certain embodiments, the transconductance of the second stage may be increased by providing two transconductors coupled at their base nodes.

主权项

1. A two-branch multi-stage amplifier circuit comprising:
a first stage, comprising a first-branch transconductance and a second-branch transconductance electrically coupled to the first-branch transconductance; wherein the electrical coupling is disposed so that a current iH flowing into the first-branch transconductance as a bias current iB1, where iB1=iH, is provided substantially to the second-branch transconductance as a bias current iB2=iB1; and a second stage comprising a first second stage branch and a second second stage branch, wherein current flowing into the first second stage branch is not provided to the second second stage branch.