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Unformatted text preview: Homework 4 By Yuan Zhou EECT 7329 Advanced Analog IC Design Homework 4 Yuan Zhou Step 1. Simulate the return ratio of differential feedback loop In this part, we are going to measure the generalized return ratio of the 5transistor amplifier and the foldedcascode amplifier we designed before. (a) Break the loop at summing nodes td od rd rd+ (a) Voltage return ratio at summing nodes td od rd rd+ (b) Current return ratio at summing nodes Figure 1: Circuits for return ratio simulation First, we break the differential feedback loop at the summing nodes of the amplifier. The circuit for simulating voltage return ratio is shown in Fig 1a. The circuit for simulating current return ratio is shown in Fig 1b. The generalized return ratio is defined as: 1 RR = 1 RR V + 1 RR I (1) According the equation, the generalized return ratio is calculated. For the fivetransistor amplifier the calculated return ratio is shown in Fig. 2a. The generalized return ratio of the foldedcascode amplifier is shown in Fig. 2b. (b) Break the loop at the output nodes Then we break the differential feedback loop at the output nodes of the amplifier. The circuit for simulating voltage return ratio is shown in Fig 3a. The circuit for simulating 1 Homework 4 By Yuan Zhou 10 4 10 6 10 8 10 105040302010 10 20 30 Freq (Hz) dB 10 4 10 6 10 8 10 1012010080604020 Freq (Hz) Degree (a) Fivetransistor amplifier 10 4 10 6 10 8 10 10605040302010 10 20 30 40 Freq (Hz) dB 10 4 10 6 10 8 10 1025020015010050 Freq (Hz) Degree (b) Foldedcascode amplifier Figure 2: Generalized return ratio measured at summing nodes current return ratio is shown in Fig 3b. The generalized return ratio is calculated in the same way. For the fivetransistor amplifier the calculated return ratio is shown in Fig. 4a.same way....
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 YUNCHIU
 Amplifier, Transistor

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