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Single-Ended Versus Differential Operation

Single-Ended Versus Differential Operation. The transitions disturb the differential by equal amounts, leaving the difference in tact. Immunity to Supply Noise. If VDD changes by ∆V, Vout changes by the same amount. Noise in VDD affects VX and VY, but not Vx-Vy.

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Single-Ended Versus Differential Operation

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  1. Single-Ended Versus Differential Operation The transitions disturb the differential by equal amounts, leaving the difference in tact.

  2. Immunity to Supply Noise If VDD changes by ∆V, Vout changes by the same amount. Noise in VDD affects VX and VY, but not Vx-Vy

  3. Basic Differential Pair

  4. CS with resistive source degeneration Interpretation: The resistance at the drain Divided by the resistance in the source path

  5. Treat M1 as a CS stage with resistive source degeneration to find VX/Vin

  6. Half-Circuit Concept

  7. Schematic of Differential Amplifier

  8. Simulation Vin,m=1 mV Vout,m=8.735 mV Av=-8.735 Calculations: Gm=1mS ro=30.53 KOhm RL=12 Kohm Av=-Gm(ro||RL)=-8.615

  9. Combine a Current Mirror with a Differential Pair

  10. Small Signal Gain The swing at X is low since the impedance at X is 1/gm3. So the X can be approximated as an AC ground for the purpose calculating Gm.

  11. Rout When a voltage is applied to the output to measured Rout, the gate voltage of M4 does not remain constant.

  12. Active Current Mirror

  13. Voltage Gain of Active Current Mirror Vin,pp=2 mV Vout,pp=46.69 (Simulation) Vout,pp=47.21 mV (Analytical calculation)

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