Question: A balanced fully differential circuit displays only odd-order nonlinearity. Use SPICE to verify this fact for the op amp in the example in Section 12.6.1.

A balanced fully differential circuit displays only odd-order nonlinearity. Use SPICE to verify this fact for the op amp in the example in Section 12.6.1.

(a) Either use SPICE to find the distortion in the output waveform for a low-frequency differential sinusoidal input, or use SPICE to plot the dc transfer characteristic V_od versus V_id and verify that the characteristic is odd.

(b) Repeat (a) with a 1 percent mismatch between W₁ and W₂. Observe that even-order nonlinearity now exists.

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FULLY DIFFERENTIAL OP AMP VDD 1 0 165 VSS 2 0 165 VI 3 4 DC 0 SIN 0 1E41K VEI 14 0 038 VB2 15 0056 VB3 16 0067 VCM 13 0 0 M1 7 3 5 1 CHOSP W77U L1U M2 8 4 5 1 CMOSP W77U L1U M3 7 15 2 2 CMOSN W4U L10 ... View full answer

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