ECE 231 -13

# Operational amplifiers vint voutt iint ground r1 100

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Operational Amplifiers vin(t) ~ vout(t) iin(t) Ground R1 =100 + - + - +9 Volts ( β -1) iin(t) R3 =83k Ignoring DC offsets: iin(t) = Vin(t)/Rin vout(t) = (-100 x ( β -1) x Vin(t)/Rin Rin Gain = vout(t)/vin(t )= ( β -1) x 100/Rin In the LTspice program, for the 2N3904 transistor, β = 300 The simulated gain is approximately 80. Therefore Rin is approximately 299 x 100/80 ~ 375 Ohms

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Operational Amplifiers + - vin(t) ~ vout(t) iin(t) Ground R1 =100 vn(t) + - + - R4 =10 +9 Volts 299 iin(t) R3 =83k Ignoring DC offsets: iin(t) = [(vin(t) - vn(t)]/Rin vn(t) = 10 x 300 x iin(t) vout(t) = - 100 x 299 x iin(t) vn(t) = (-1/10) x 300/299 x Vout(t)]= γ

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