8/18/2019 Naser_PSpice

1/1

 

ELEC 4225 Midterm Computer Project - Due 3/30/2016

Design a DC current source to meet the following specifications:

- Current source value: 100 u-amps +/- 1% (over all possible load and supply voltage

conditions).

- Output resistance: >20 Mohms.

- Available DC voltage sources are bipolar and range from 5 to 15 volts in magnitude.

- Maximum allowable resistor size is 20kohm (do not add resistors in series to obtain larger

values).

- Specify the maximum allowable load range.

You may use any BJT(s), JFET(s) or MOSFET(s) available in the PSpice library. Refer to thecircuits presented by Soclof at the end of chapter 3 for ideas.

Write up your design in a report with the following format:

- Cover page including name, course, date and title.

- Description of circuit operation (1 page max).

- PSpice/ORCAD simulation(s) showing that all of the required specifications are met.

- A plot of the output impedance vs. frequency.

- Complete listing of the model parameters of all devices used in the design. (Draw a model

showing where they all go.)- Characteristic curves of the devices used showing the parameters of the simplified DC

model. (Design a test circuit to plot these curves.)