Engineering Sciences 154 
For comparison see NMOS Differential AmplifierFrom discussion of bjt physics, we havewhich, in turn, allows us to write


See an example of a two stage differential amplifier (source)If there is a small resistive mismatch, we can write or which allows us to write For small differential voltage
For comparison see BJT Differential Amplifier
From our earlier discussion of mos physics, we haveIf we make the two devices identical we can write and we know thatwhich allows us to writeWhen we square the bracket term, we get the quadratic equationwhich has the solutionsFinally, we obtain the normalized form for the transfer function for the differential amplifier.
where we have used from earlier analysis the result thatfor each transistor in the pair.

For small differential voltage



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Extensive notes from Professor Edgar SánchezSinencio's course Advanced Analog Circuit Design Techniques. See in particularLectures by Professor Roger T. Howe for his course Microelectronics Devices and Circuits. See also Integrated Microelectronics: An Integrated Approachs
Multistage and Power Amplifiers (local copy) from the course notes of Professor Ralph Mason at Carleton University.
Local Copies of Particularly Relevant Howe Notes MOSFET Amplifier... Lecture 20 Device Models... Lecture 29 Generalized Amplifer... Lecture 21 CE Frequency Response... Lecture 30 Common Source Amp... Lecture 22 Multistage Amplifiers... Lecture 31 Common Gate Amp... Lecture 23 DC Coupling... Lecture 32 Common Drain Amp... Lecture 24 Two Stage BiCMOS Amp... Lecture 33 Common Emitter Amp... Lecture 25 CMOS Cascode Gm Amp... Lecture 34 Voltage/Current Sources Lecture 26 Multistage Amp Freq. Resp. Lecture 35 Frequency Response... Lecture 27 Voltage Amp. Freq. Resp. Lecture 36 Bode Plots... Lecture 28 CMOS Two Stage Op Amp Lecture 37 BiCMOS Two Stage Op Amp Lecture 38 Design of CMOS linear circuits
Amplifiers  Basic Information
On the classification power amplifiers:
Tubes Versus Transistors  Is There an Audible Difference?
Transistor Gain and Configurations
Reading 26 of the Online Radio and Electronics Course