Low distoration driving amplifier for integrated filters

摘要

Several embodiments of an intermediate frequency (IF) amplifier, which exhibit improved distortion characteristics, are disclosed for use in an integrated transceiver circuit. The amplifier has a differential stage comprising two transistors which compare a voltage derived from an amplifier input signal with a voltage derived from the amplifier output signal to determine the portion of a bias current which will be supplied to one or more current mirrors. Output current from the one or more current mirrors is further used to bias an output transistor which drives a load impedance.