Basic MOS Amplifiers: DC and Low Frequency Behavior

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Presentation transcript:

Basic MOS Amplifiers: DC and Low Frequency Behavior

1- Common Source (CS) Amplifier

DC Biasing: a) Bias the input transistor from the output of the previous stage

b) Biasing suitable for AC coupling to the signal source For LF and wide-band applications For HF low noise applications

c) Biasing suitable for DC coupling to the signal source (The bias resistor or inductor connected to the input is eliminated)

The linearisation of the current-voltage relation and the small-signal equivalent circuit:

The equivalent circuit that represents this expression:

Example: The circuit diagram and the small signal equivalent circuit of a resistance loaded amplifier.

Example: The circuit diagram and the small signal equivalent circuit of a passive PMOS (DC current source) loaded amplifier.

DC Biasing arrangements: a) Biasing via an inductor Lch : High inductance choking coil Not suitable for on-chip solutions!

b) Determination of the DC quiescent current with a current source