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TWO STAGE OPAMP DESIGN

1. Requirements

  • Schematic and specification:

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2. Design

  • Calculate Kn, Kp from library 180nm

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With L of PMOS and NMOS are 0.5um

  • Find W3, W4

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  • Find W1, W2

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  • Find W5

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  • Find W6

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  • Find W7 and calculate Av, Pdiss

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  • Calculate Vbias and Vout(max), Vout(min)

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3. Results

  • LTSPICE schematic:

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  • Simulation of Av: Vpp of Vin is 10uV, Vpp of Vout is 56.3mV => Av = 56.3mV / 10uV = 5630 V/V

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  • Simulation of Gain Bandwidth and Phase Margin: At 0dB have GB = 9.23MHz and PM = 180 - 112 = 68 degree

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  • Simulation of ICMR: Connect Vout with Vin(-) and simulate in DC mode has ICMR: -0.081V -> 0.333V

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  • Simulation of Vout range: simulate with DC mode has Vout range: -0.64V -> 0.753V

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  • Simulation of Slew Rate:

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  • Simulation of Power Dissipation

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Comparision

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Two stage opamp

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