Methods and apparatus for calibrating for transconductance or gain over process or condition variations in differential circuits

摘要

An apparatus is provided. The apparatus includes a calibration circuit configured to generate a reference signal and at least one differential circuit each being configured to operate at a calibrated transconductance over process or condition variations based on the reference signal. The calibration circuit may be configured to generate the reference signal independent of the at least one differential circuit. A method for operating at least one differential circuit is provided. The method includes generating a reference signal and operating the at least one differential circuit at a calibrated transconductance or gain over process or condition variations based on the reference signal. The reference signal may be generated independently of the at least one differential circuit.

主权项

1. An apparatus, comprising:
a calibration circuit configured to generate a reference signal; and at least one differential circuit each being configured to operate at a calibrated transconductance over process or condition variations based on the reference signal, wherein the calibration circuit is further configured to generate the reference signal independent of the at least one differential circuit and to provide a feedback of the reference signal and adjust the reference signal based on the feedback, wherein the calibration circuit further comprises an operational transconductance amplifier (OTA) configured to generate a tail current based on the feedback.