Cascode amplifier

[PL]

Design the cascode amplifier shown in the figure for TSMC 0.35μm technology. The parameters of the amplifier are given in the table and the version assignments can be found in the lista_aus file. NOTE, transistor sizes can be varied with a step of λ=0.2μm, with a minimum transistor size of W/L=3λ/2λ. Assume the following transistor parameters for the calculations: NMOS KP=94u VT0=0.55 GAMMA=0.6 LAMBDA=0.04; PMOS KP=33u VT0=-0.75 GAMMA=0.4 LAMBDA=0.06. The channel length modulation factor LAMBDA actually depends on the channel length of the transistor. To take this into account, use the LAMBDA values provided in the file lambda-f(L).txt

Design procedure - determine sequentially taking into account the specified amplifier parameter:

1) calculate amplifier bias current (Pdiss, SR)

2) choose the channel length L ( the same for all transistors)

3) calculate W₃/L₃ (I i Vout_max)

4) calculate V_GG3

5) calculate W₁/L₁ (Av, λ)

6) calculate W₂/L₂ (V_DSsat2=Vout_min- V_DSsat1)

7) calculate V_GG2

8) calculate V_IN(DC voltage for bias gate of M1)

Verify the basic amplifier parameters by simulation using Spice MOS Level 1transistor model (Av, Vout_max, Vout_min, SR, Pdiss)
Using the simulator, optimise the amplifier for the BSIM3 MOS model to meet the specified parameters. Report the following amplifier parameters after optimisation: Av, Vout_range, SR, R_out, P_diss, f_3dB, GB.
Present the amplifier design in a report in doc, odt or pdf format. The report should include a summary of the determined parameters in a table and appropriate graphs, calculations and conclusions.The report should be accompanied by input files to SPICE (cir).
The zipped report with attached files should be sent by email only. In the subject line give: First name_Name_index number_AUSlab_task3.

Parameters of the cascode amplifier: