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Lectures 29 and 30

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 doesn’t 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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