In this video, we will discuss the sixth example of a MOSFET differential amplifier using two n-channel MOSFETs. The differential amplifier is biased using a cascode current source constructed by only MOSFETs (five in total). Therefore, this current source does not use any resistors to create the reference current, which was the case in the previous examples. This current source configuration is better than simple current mirror.
The load is formed by a p-channel MOSFET current mirror, which creates an active load. An active load can increase the load resistance significantly and thereby the voltage gain.
Given the circuit component values, we will calculate the balanced differential-mode voltage gain and balanced common-mode voltage gain. We also verify our calculations using simulations in TINA-TI SPICE.
👉 More Transistor Current Sources: • IC Biasing - Transisto...
📚 Resources 👇
Microelectronics, Donald Neamen
Microelectronic Circuits, Sedra & Smith
Fundamentals of Microelectronics, Behzad Razavi
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