Figure Q1(b) shows a single-stage amplifier driving a load of RL and C

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Figure Q1(b) shows a single-stage amplifier driving a load of RL and CL. VBIAS and IDC are DC bias voltage and current of the transistor Q1, respectively. By considering the internal capacitive effect of Q1, analyse the circuit using high-frequency small-signal model to obtain the pole frequencies of the circuit, assuming the Early effect is neglected. [10 Marks] Figure Q1(b)

Figure Q1(b) shows a single-stage amplifier driving a load of RL and CL. VBIAS and IDC are DC bias voltage and current of the transistor Q1, respectively. By considering the internal capacitive effect of Q1, analyse the circuit using high-frequency small-signal model to obtain the pole frequencies of the circuit, assuming the Early effect is neglected. [10 Marks] Figure Q1(b)

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Figure Q1(b) shows a single-stage amplifier driving a load of

R_{L}

and

C_{L} . V_{B I A S}

and

I_{D C}

are DC bias voltage and current of the transistor

Q_{1}

, respectively. By considering the internal capacitive effect of

Q_{1}

, analyse the circuit using high-frequency small-signal model to obtain the pole frequencies of the circuit, assuming the Early effect is neglected. [10 Marks] Figure Q1(b)

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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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