Operational transconductance amplifier, operational transconductance amplifier-capacitor filter and high order reconfigurable analog filter

摘要

An operational transconductance amplifier includes a fully-differential amplifying circuit, a bias driving circuit, and a common mode feedback circuit. The fully-differential amplifying circuit is configured for receiving a differential input voltage and providing a differential output voltage. The fully-differential amplifying circuit includes a plurality of diffusor-differential-pair circuits. The bias driving circuit is configured for providing at least one first bias current to drive the fully-differential amplifying circuit and adjust the transconductance of the transconductance amplifier. The common mode feedback circuit is configured for stabilizing the differential output voltage. An operational transconductance amplifier-capacitor (OTA-C) filter and a high order filter are disclosed herein as well.

主权项

1. An operational transconductance amplifier, comprising:
a fully-differential amplifying circuit, configured for receiving a differential input voltage and for providing a differential output voltage, the fully-differential amplifying circuit comprising a plurality of diffusor-differential-pair circuits, wherein each of the diffusor-differential-pair circuits comprises a first diffusor-differential-pair unit, wherein the first diffusor-differential-pair unit comprises:
a first diffusor-pair unit comprising a first PMOS transistor and a second PMOS transistor, wherein the source of the first PMOS transistor is electrically connected with the source of the second PMOS transistor, and the drain of the first PMOS transistor is electrically connected with the drain of the second PMOS transistor;a second diffusor-pair unit comprising a third PMOS transistor and a fourth PMOS transistor, wherein the source of the third PMOS transistor is electrically connected with the source of the fourth PMOS transistor, and the drain of the third PMOS transistor is electrically connected with the drain of the fourth PMOS transistor; anda first differential-pair unit electrically connected with the first diffusor-pair unit and the second diffusor-pair unit; a bias driving circuit, electrically connected with the fully-differential amplifying circuit, the bias driving circuit being configured for providing at least one first bias current to drive the fully-differential amplifying circuit and adjust the transconductance of the operational transconductance amplifier; and a common mode feedback circuit, electrically connected with the fully-differential amplifying circuit, the common mode feedback circuit being configured for stabilizing the differential output voltage.