Chapter: Electronic Circuits : MOSFET Amplifiers
MOSFET Differential amplifier
DC Solution, Small Signal or AC Solutions, Common-Mode Rejection Ratio
MOSFET Differential amplifier
DC Solution
(a)
Zero both input. Divide the tail supply into equal parallel current I’0/2
in parallel with a resistor 2 RQ. The circuit obtained for M1
is shown on the left in Fig. 2. The circuit for M2 is identical. Now
make a Thevenin equivalent as shown in on the right in Fig. 2. This is the
basic basic bias circuit.
Small Signal or AC Solutions
The
solution assume that the two FET’s are matched
Common-Mode Rejection Ratio
The
CMRR for the BJT differential amplifier was defined with the output taken from
only one side of the diff amp. To illustrate another way of defining the CMRR,
it will be assumed that the output is taken differentially between the two
outputs. In this case the CMRR is doubled.
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Electronic Circuits : MOSFET Amplifiers : MOSFET Differential amplifier |
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Electronic Circuits : MOSFET Amplifiers