Question
Download Solution PDFThe CMOS inverter can be used as an amplifier when:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
The CMOS inverter can be used as an amplifier if properly biased in the transition region of its voltage‐transfer characteristics :
The voltage-transfer characteristics is shown below:
The voltage transfer characteristic curve of the CMOS Inverter is calculated as:
In region (1), NMOS is off and
in the region (2), PMOS is off.
In this region, CMOS Inverter can be used as a NOT Gate.
Region (3): CMOS inverter can be used as an amplifier because small changes in input voltage (in mV) can cause a large change in output voltage.
then both MOSFETs will be in the saturation region and will act as amplifiers.
Hence option (3) is the correct answer.
Important Points
then NMOS has greater overdrive voltage, therefore, NMOS will be in the triode region, and PMOS will be in the saturation region.
then PMOS has greater overdrive voltage, therefore, PMOS will be in the triode region, and NMOS will be in the saturation region.
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