Determine the voltage gain and the signal waveforms at various points.

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Determine the voltage gain and the signal waveforms at various points. Assume that CC1 and CC2 are very large. β = 100, VA = 100 V. (a) Find the dc voltages at the base, emitter, and collector. (b) Find gm, rπ and r0. (c) If terminal Z is connected to ground, X to a signal source vsig with a source resistance Rsig = 2 kΩ, and Y to an 10−kΩ load resistance, use the hybrid−π model to draw the small-signal ac equivalent circuit of the amplifier. Calculate the overall voltage gain vy/vsig .

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Determine the voltage gain and the signal waveforms at various points. Assume that

C_{C 1}

and

C_{C 2}

are very large.

β = 100, V_{A} = 100 V

. (a) Find the dc voltages at the base, emitter, and collector. (b) Find

g_{m}, r_{π}

and

r_{0}

. (c) If terminal

Z

is connected to ground,

X

to a signal source

v_{sig}

with a source resistance

R_{sig} = 2 k Ω

, and

Y

to an

10 - k Ω

load resistance, use the hybrid

- π

model to draw the small-signal ac equivalent circuit of the amplifier. Calculate the overall voltage gain

v_{y} / v_{sig}

.

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Figure P7.33 shows a discrete-circuit amplifier. The input signal vsig is coupled to the gate through a very large capacitor (shown as infinite). The transistor source is connected to ground at signal frequencies via a very large capacitor (shown as infinite). The output voltage signal that develops at the drain is coupled to a load resistance via a very large capacitor (shown as infinite). All capacitors behave as short circuits for signals and as open circuits for dc. (a) If the transistor has Vt = 1 V, and kn = 4 mA/V2 , verify that the bias circuit establishes VGS = 1.5 V, ID = 0.5 mA, and VD = +7.0 V. That is, assume these values, and verify that they are consistent with the values of the circuit components and the device parameters. (b) Find gm and ro if VA = 100 V. (c) Draw a complete small-signal equivalent circuit for the amplifier, assuming all capacitors behave as short circuits at signal frequencies. (d) Find Rin, vgs/vsig, vo/vgs, and vo/vsig.

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