3-69
A-27.
1 megahertz.
Open-loop Gain-Bandwidth Product = Closed-loop Gain-Bandwidth Prod.
Open-loop Gain-Bandwidth Product = 200,000 30 (Hz)
Open-loop Gain Bandwidth Product = 600,000
Closed-loop Gain Bandwidth Product = 6 Bandwidth
6,000,000 = 6 Bandwidth
1,000,000 (Hz) = Bandwidth
A-28.
The adder simply adds the input signals together while the summing amplifier multiplies the sum
of the input signals by the gain of circuit.
A-29.
Yes, a summing amplifier can have as many inputs as desired.
A-30.
A summing amplifier that applies a factor to each input signal beforeadding the results.
A-31.
A scaling amplifier.
A-32.
A-33.
0 volts. (The two inputs to the operational amplifier are both at 0 volts.)
A-34.
The difference amplifier multiplies the difference between the two inputs by the gain of the circuit
while the subtractor merely subtracts one input signal from the other.
A-35.
No.
A-36.
A difference amplifier.
