Estimate the delay through the circuit in Fig. Use the 180 nm process with 10/1 NMOS devices. Also verify the estimate with a SPICE simulation Solution: Do at your own. HINT: Use the quadratic dependence formula of the series connected transistors.
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Estimate the delay through the circuit in Fig. Use the process with NMOS devices.
Also verify the estimate with a SPICE simulation
Solution: Do at your own.
HINT: Use the quadratic dependence formula of the series connected transistors.
![You are required to design an all-NMOS differential amplifier with a single sided output in a 0.35 um CMOS process. You have a single 3.3 V DC supply rail at your disposal. Your amplifier should make use of an active load amplifier configuration. Use the following NMOS device in your SPICE simulation: . MODEL MYNFET1 NMOS VTO = 0.6 KP = 170 E−6 W = 0.35 E−6 L = 0.35 E−6 Structure your report to match the grading rubric below. Question 1 Using an ideal current source with 2 MΩ output impedance, design the DA for 15 V/V differential gain over a 20 kΩ load resistor connected in a single sided output configuration. [3] Present appropriate design calculations for RD, IQ and the device W/L](https://www.doubtrix.com/uploads/editor/2180741496PGKVFXEEsg.png)
![An NMOS amplifier is shown in Figure 1. Transistor M1 is biased in the saturation region for an amplifier application. The circuit is biased with a resistive voltage divider consisting of R1 and R2, a source degeneration resistor RS, and a load resistor RD. The drain bias current for the design is ID = 500 μA and VDS is 1.625 V. The device parameters are: L = 0.5 μm, W = 10 μm, kn′ = 200 μA/V2, Vtn = 0.5 V, and λn = 0. CMOS 0.5 u Process . op . model NMOS1 nmos (KP = 200 u, VTO = 0.5, LAMBDA = 0) ;tran20 m Figure 1: A NMOS amplifier circuit including a source degeneration resistor RS. a) Determine R1 and R2 for the specified bias point. b) Determine the value for RD for the specified bias point. c) Use the LTSPICE circuit template and verify your bias circuit design. Include a copy of the schematic and the dc operating point results (text log with node voltages and currents). [8] d) Use LTSPICE to evaluate the change in ID for a variation in the technology process parameter kn′. Evaluate the change in ID for a change of ±10% in kn′. Compare the relative change in ID with the relative change in kn′. What do you observe? Explain how the source degeneration resistor RS implements negative feedback which reduces the sensitivity of the bias point to changes in kn′. [8]](https://www.doubtrix.com/uploads/editor/9212363628QZkAUhRzqb.jpg)
