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215anotes_2

215anotes_2 - EE215A Fall 08 B Razavi HO#5 Single-Stage...

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EE215A B. Razavi Fall 08 HO #5 13 Single-Stage Amplifiers Many aspects of the performance of amplifiers are citical. We summarize the tarde-offs as whown below. The amplifiers to be studied here include: CS and CG stages, source followers, and cascades. For each stage, we wish to study both the large-signal and small-signal properties. Common Source Stage - Large-Signal Behavior What is the small-signal gain in this region? At point A:
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EE215A B. Razavi Fall 08 HO #5 14 How do we maximize the gain? - Small-Signal Analysis We assume that the bias currents and voltages are chosen such that M 1 is in saturation and Q I in forward active region. Voltage Gain: Many CMOS technologies do not have resistors with useful sheet resistivity. So we try other tricks: This device can operate as a resistor. How about this: Common Source with “Diode” Load
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EE215A B. Razavi Fall 08 HO #5 15 How do we maximize the voltage gain here? Large Signal Behavior: Example : Common Source with PMOS Diode Load
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