Problem 4: You are only required to simulate this problem on LTSpice and attach waveforms
and answer the questions below. No hand analysis is required.
Cf
Photodiode
10K
1K
?
500pF
10K
1K
v_out
+
LM741
Assuming the op-amp LM741 shown above is supplied with $V_{cc} = 15V$, $V_{ee} = -15V$:
For $C_f = 0F$
a) If the AC magnitude of the photodiode current is 1A
\begin{itemize}
\item plot $v_{out, AC}$.
\item What is the -3dB bandwidth of the circuit?
\end{itemize}
b) If the photodiode current has a pulse waveform where $I_1 = 0$, $I_2 = 100\mu A$, $T_{pulse} =$
100$\mu s$, $t_{rise} = t_{fall} = 1ns$, $duty\_cycle = 50\%$:
\begin{itemize}
\item plot $v_{out, tran}$ over roughly 10 input cycles.
\end{itemize}
c) Repeat a), and b) for $C_f = 150pF$
