Abstract
A fully differential circuit in which all inputs and outputs of transconductors Gm1+, Gm1−, Gm2+, Gm2− and fixed gain amplifier GA are fully differential signals. The number of feedback loop elements is made odd by the addition of a fixed gain amplifier with a gain of 1 which is not used in conventional filter architecture, each element of the configuration consequently inverts the common voltage, and since the feedback loop has negative feedback with respect to the common voltage, the operating point can be determined without a need for a dedicated DC feedback circuit.
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