Transconductance control circuit, particularly for continous-time circuits

摘要

A transconductance control circuit, particularly for a continuous-time filter, comprising a transconductor (4) across which a constant voltage is input; the transconductor is connected to a DAC (7) to set a reference current (IR); a feedback loop (9, 10, 23, 11) is provided between the output of the transconductor (4) and its input; the particularity of the circuit is the fact that it further comprises means (20, 22, 24) for mirroring the reference current (IR) set by the DAC (7) which are suitable to mirror the current both to the feedback loop and to at least one cell of a filter which is cascade-connected. <IMAGE>