A system including a source follower circuit is disclosed. The source follower circuit configured as a voltage buffer that includes a first common-drain transistor that passes an input signal at the gate to an output loading capacitor at the source, and a second common-drain transistor that is used as a bias current source. The source follower circuit includes a first resistor at the drain of the first transistor generating a first voltage that is fed back through a first path through the gate of the second transistor so as to produce additional current to help the output signal catch up with the input voltage. The source follower circuit further includes an inductive element and bias circuit, which along with the first resistor, increases bandwidth and reduced settling time.

Polyphase filter circuitry including: an input node to receive an input signal V.sub.IN having a dominant frequency f.sub.PPF; and a common-source amplifier circuit. The common-source amplifier circuit includes a field-effect transistor M1 with its gate terminal connected to the input node and with a capacitor C.sub.PFF connected to its source terminal; and for the common-source amplifier circuit, the output resistance R.sub.M1 at the source terminal of the field-effect transistor M1 and the capacitance of the capacitor C.sub.PFF are define the frequency response of the common-source amplifier circuit so that, based on the input signal V.sub.IN, a signal V.sub.LEAD is generated at the drain terminal of the transistor M1 which leads the input signal V.sub.IN in phase by a given phase shift .sub.LEAD and a signal V.sub.LAG is generated at the source terminal of the transistor M1 which lags the input signal V.sub.IN in phase by a given phase shift .sub.LAG.