[PL]

Two-stage operational amplifier

Calculations, simulation tests, and layout design

Task:

·        preparation for lab - design of a standard two-stage operational amplifier,

·        simulation tests of designed operational amplifier,

·        layout design of the amplifier, extraction of the schematic from the layout design and final verification of the amplifier parameters.

 

In the exercise, design a standard two-stage operational amplifier, using the procedure presented in lecture, for TSMC 0,35 μm (parameters, model) technology. The amplifier parameters are given in the table, and the version assignments are listed 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=0.55 LAMBDA=0.04; PMOS KP=33u VT0=-0.75 GAMMA=0.4 LAMBDA=0.06. In fact, the channel length modulation factor LAMBDA depends on the channel length of the transistor. To take this into account you can use the LAMBDA values provided in the file lambda-f(L).txt.

 

After performing the calculations, the basic parameters of the amplifier (Av, GB, PM, ICMR, Vout range, SR, Pdiss) should be verified by simulation (Spice MOS Level 1). Then, for the BSIM3 MOS model, optimize the amplifier so that the set parameters are satisfied. All the amplifier parameters (Av, GB, PM, ICMR, CMRR, PSRR, Vout range, SR, Rout Pdiss) should be verified by simulation and should be stored in a table. Make the layout design of the amplifier using the MAGIC program using transistor placement similar to exercise 2. From the layout design, extract the amplifier schematic and perform final verification (and possible optimization) of the amplifier parameters.

 

For the assignment, prepare a report in doc, odt or pdf format according to the attached template. The report should include a summary of the determined parameters in a table and the corresponding graphs, calculations and conclusions. You should attach files for SPICE simulator (cir) and layout projects (mag) to the report. NOTE: Each simulation should be accompanied by the corresponding file ready to run! Zipped reports with attached files should be sent only by e-mail, in the subject write: Name_Sureme_index number_AUSLAB_year_zad4_vx (vx - version number).

 

Specified amplifier parameters:

     

Parametr

Jednostka

Opamp_v1

Opamp_v2

Opamp_v3

Av ≥

V/V

20000

10000

10000

GB ≥

MHz

5

 10

13

ICMR ≥

V

1.2-2.7

1.2-2.7

1.2-2.7

Voutrange ≥

V

0.3-2.7

0.3-2.7

0.3-2.7

CL

pF

10

6

5

SR ≥

V/µs

7

8

8

Vdd

V

3.0

3.0

3.0

Vss

V

 0

 0

 0

Pdiss≤

mW

0.6

1.0

1.0