ANALOGUE IMPLEMENTATION OF A SAMPLED FILTER WITH FINITE IMPULSE RESPONSE USING A GAIN-CONTROLLABLE TRANSCONDUCTANCE AMPLIFIER

摘要

The invention relates to sampled filters with finite impulse response or FIR filters. More specifically, the invention relates to an FIR filter including: a controlled gain transconductance amplifier (AGM), at least one sampling capacitance (CE) intended to receive an output current (di) from the amplifier and periodically to accumulate the charges produced by N successive samples of said current, and means (K) for controlling the gain of the amplifier in order to provide the amplifier with a desired individual gain for each of the N samples. The coefficients of the finite impulse response filter are weighted by the transconductance gain of the amplifier and not by the value of a capacitance.