9.63 A CS amplifier represented by the equivalent circuit
of Fig. 9.19 has Cgs = 2 pF, Cgd = 0.1 pF, CL = 2 pF, gm=4mA/V and R′ sig = 20 kΩ.It is required to find
AM, fH, and the gain–bandwidth product for each of the following
values of RL=5 kΩ, 10 kΩ,and 20 kΩ. Use the
approximate expression for fP1 in Eq. (9.94). However, in
each case, also evaluate fP2 and fZ to ensure that a dominant
pole exists, and in each case, state whether the unity-gain
frequency is equal to the gain–bandwidth product. Present
your results in tabular form, and comment on the gain–
bandwidth trade-off.
9.63 A CS amplifier represented by the equivalent circuitof Fig. 9.19 has Cgs = 2 pF, Cgd = 0.1 pF, CL = 2 pF, gm=4mA/V and R′ sig = 20 kΩ.It is required to findAM, fH, and the gain–bandwidth product for each of the followingvalues of RL=5 kΩ, 10 kΩ,and 20 kΩ. Use theapproximate expression for fP1 in Eq. (9.94). However, ineach case, also evaluate fP2 and fZ to ensure that a dominantpole exists, and in each case, state whether the unity-gainfrequency is equal to the gain–bandwidth product. Presentyour results in tabular form, and comment on the gain–bandwidth trade-off.
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