The current output of a PIN photodiode, shown in Figure P3.13, operating in the zero voltage mode is conditioned by an OP37 op-amp. The input signal is a sinusoidal modulated light power at 640 nm,...

The current output of a PIN photodiode, shown in Figure P3.13, operating in the zero voltage mode is conditioned by an OP37 op-amp. The input signal is a

sinusoidal modulated light power at 640 nm, Pi(t) = 0.5 P_pk
[1 + sin(w_ot)]. Assume that the PD’s I_rs
= 0.1 nA, V_T
= 0.0259 V, I_P
= (nq/(hv)P_i, that the PD makes white thermal and shot noise currents of (4kT_gd
+ 2qI_Pav) MS A/Hz, the op-amp has e_na
= 3 nV/
, i_na
= 0.4 pA/
 and R_F
makes thermal noise. 4kT = 1.656
 10^-20, R_F
= 10⁴
Ωand the noise bandwidth, B = 1 kHz around f_o
= w_o=2 = 10 kHz.

(A) Write an expression for the MS output SNR.

(B) Find a numerical value for P_pk
that will give unity SNR_o.

(C) What P_pk
will saturate V_o
at 12.5 V?