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Q1. Determine the current
For the current mirror below, determine the current I_0.
Q10. Find the input capacitance
For the small signal circuit given below, estimate the input capacitance as seen from the terminal G using the Miller's method.
Q9. Find the input pole
For the amplifier below, determine the input pole frequency (in rad/s). Note that the transistors are identical and have the values,
C_{\mu} = 0.5 pF, and the transition frequency
f_T = 400 MHz. The
C_{\mu} and
C_{\pi} obey the relation
C_{\mu} + C_{\pi} = \frac{g_m}{2\pi f_T}. Assume that the 0.4mA current source provides 0.2mA current to each transistor at bias conditions.
Q8. Find the output waveform
If the op-amp below has the following frequency response \frac{A_0}{(1+\frac{s}{\omega_0})} for its differential gain, determine the output waveform
v_{out}(s). Here
s is the Laplace variable.
Q7. Find the input pole
For the circuit below, find the input pole (in rad/s) using Miller's theorem. Assume that
r_o is infinity and neglect parasitic capacitances. The current source biasing Q2 transistor is ideal. Assume
g_m and
r_{\pi} for Q1 is known.
Q6. Estimate the output pole
Use Miller's theorem to estimate the input and output pole (in rad/s) of the circuit shown below. Assume
V_A = \infty and ignore all the parasitic capacitances.
Q5. Find the small signal gain
Consider the common-base amplifier shown below, where the output resistance r_o of the NPN BJT is drawn explicitly. Estimate the small signal gain
v_{out}/v_{in} for this amplifier using the Miller's theorem. In your estimation assume
r_o is large enough to allow the approximation
v_{out}/v_{x} = g_m R_C when you apply Miller's theorem to simplify the circuit.
Q4. Find the input impedance of the circuit
The BJT transistor circuit below is shown with its parasitic capacitance C_{\pi},
C_{\mu} and
C_{\text{CS}}. Find the input impedance
Z_{in}(s) using Miller's theorem. Assume
\beta and
g_m given for this setup. Here
s is the Laplace variable.
Q3. Find the input resistance
For the ideal op-amp circuit given below, using Miller's theorem, find the input resistance R_{in} as indicated?
Q2. Find the output waveform
If the input to the op-amp circuit below is A\text{sin}(\omega t) + B\text{cos}(2 \omega t) where
A and
B are constants, and
\omega is the angular frequency, what is the output waveform? Assume that the op-amp input impedance is infinite but it has a frequency dependent differential gain given by
\frac{G\omega_0}{(\omega_0+j \omega)} , where
G is a constant and
\omega_0 is a constant.