Assignment #1
#1-6 The design specifications for a simple inverting amplifier require an input resistance
of 10 kΩ and a voltage gain, A = - 6.2
a) Prepare a design using an ideal OpAmp.
b) If a real OpAmp with the properties:
• Ri = 2 MΩ
• A = 200 k
• Ro = 75 Ω
is used, what error in the gain and input resistance will result due to the non-ideal
properties of the OpAmp?
Solution: Will be included this week
#1-11. Determine the current through the load resistor, RL, as a function of the input voltage,
vi, for the given circuit. Know that v2 = v1 and that iRL = v2/RL .
Solution: Write node voltage equations at v2 and v1:
@ v1 :
@ v2 :
, since v2 = v1
but (v1 - vo )/4.7k = (vi - v1 )/2.2k = (vi - v2 )/2.2k so:
.
Note also that iRL = v2 /RL .
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