Low-power BiCMOS op-amp with integrated current-mode charge pump

摘要

An operational amplifier with an integrated current-mode chargenpump is presented. This operational amplifier functions with a 4-ΜAnsingle-supply above-the-rail input and rail-to-rail output. Having annintegrated charge pump greatly simplifies the amplifier design whilenproviding an increased dynamic range over other rail-to-rail amplifiers.nThe current-mode charge pump limits the power loss associated withnfeedthrough current found in most voltage mode designs. The resultingnamplifier, designed with a dual-well BiCMOS process, achieves anbandwidth of 54 kHz while consuming less than 10 ΜW