Lectures 29 and 30 - Lectures 29 and 30 More op-amp...

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Unformatted text preview: Lectures 29 and 30 More op-amp circuits Some causal intuition Op-amp doesnt respond instantly, but has infinite gain if: dV out /dt=k(V +-V- ) If (V +-V- )>0, V out b eventually For the circuit shown, So, if Vin steps from 0V b 1V Vout slopes downward But this decreases V1 Vout slope decreases Vout settles to constant as: 1 1 1 R R R V R V V F out F in + + = R F R 1 V 1 V in V out- + F F in out F F in F out R R V V R R R V R R R V V- = +- + 1 1 1 1 1 1 R R R V V F F in + Vin V1 Vout Some causal intuition If hook it up in positive feedback For the circuit shown, So, if Vin steps from 0V b 1V Vout slopes UPWARD This increases V1 Vout slope increases Vout, V1 rise until the hit the maximum or minimum output voltage. 1 1 1 R R R V R V V F out F in + + = R F R 1 V 1 V in V out +- 1 1 R R R V V F F in + Vin V1 Vout Useful example: trans-impedance amplifier What is Vout?...
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Lectures 29 and 30 - Lectures 29 and 30 More op-amp...

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