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Unformatted text preview: i) electrons, (ii) holes), (iii) both
electrons and holes. (choose one) [3pts]
c) If the power supply voltage is 2V and ground is 0V, what bias voltage is usually
connected to the body (substrate) of the transistor? Why? [3pts]
We want to ensure the n-type side of the pn junctions is at the highest potential to keep
them reverse biased. Otherwise, we’ll get substrate current (undesirable).
d) Assume the threshold voltage of the PMOS is VTH = -0.4V. If VS = 2V, VD = 0V, find the
gate voltages for which the PMOS is (i) cut-off, (ii) in between saturation and triode
1.6 V (i)
(ii) 0.4 V e) If a PMOS and an NMOS have exactly the same dimension (W, L, and oxide thickness),
which transistor has higher g m ? W...
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- Spring '07
- Electrical Engineering