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Lecture 13 – MOSFET Common-Source Amplifiers The MOSFET common-source (CS) amplifier is the most widely used amplifier configuration. It gets the name from the fact that the source terminal is ‘common’ to both the input and output of the small signal equivalent circuit – it forms the a.c. ground. It has the advantages of a reasonable gain, combined with a very high input resistance. It has a relatively high output resistance which is a disadvantage if it has to drive high currents into a small load resistor. When it is used as part of an integrated circuit the high output impedance is not so much of a problem because the ‘load’ is the next stage of the circuit which would typically be the high impedance gate of a MOSFET. When analyzing any amplifier circuit we need to be careful to distinguish between three measures of the gain: 1) the open loop gain, Avo = the gain that would be measured for no load (RL = ∞) using an ideal signal source (Rsig = 0) 2) the loaded gain, Av = the gain that would be measured for a finite load (RL < ∞) using an ideal signal source (Rsig = 0) 3) the overall gain, Gv = the gain that would be measured for a finite load (RL < ∞) using a ‘real’ signal source with a non zero output impedance (Rsig > 0) 13.1) The Basic Structure of the MOSFET Common-Source Amplifier EEE334 Circuits II – T J Thornton Spring 2017 – Lecture 13 13.2) Small-signal Analysis of the CS Amplifier Full circuit schematic. For the DC bias analysis the capacitors are replaced by open circuits. For the final AC analysis we assume that CC1, CC2 and CS are large enough that they can be considered as short circuits for any AC frequency. EEE334 Circuits II – T J Thornton Spring 2017 – Lecture 13 Circuit used to calculate the DC bias conditions. The capacitors are treated as open circuits at DC. EEE334 Circuits II – T J Thornton Spring 2017 – Lecture 13 The circuit used for the small signal AC analysis. The capacitors have been replaced by short circuits. EEE334 Circuits II – T J Thornton Spring 2017 – Lecture 13