Question Details

(solution) Name: ___________________________________________________ ECE3040


Please do the following attached problem. Any simulation is fine, as long as the specifications are met, (i.e. a gain of >600 V/V). Please give a detailed account of your design.


Name: ___________________________________________________ ECE3040 Major Project You are to design and supply a supporting engineering report (typed) for a MOSFET amplifier to amplify

 

an audio signal with a total gain of >+600 V/V over the 10 Hz to 10 KHz range. The MOSFETS to be used

 

are power mosfets (known as HEXFETS) IRF150 and IRF9140 parts and will handle more current than

 

what we have typically used in class examples. The data sheets and PSPICE models are widely available

 

on the internet.

 

You can add large value capacitors as needed to achieve your gain specifications and can assume C1 is

 

large. The bias point should be chosen so that the amplifier can pass a 10 mV input signal and meet the

 

gain specification without clipping the signal (verified with a pspice transient plot below).

 

Due to the lateness of this bonus problem, minimal partial credit will be given. Thus, do not attempt it if

 

you cannot turn in all parts below. Name: ___________________________________________________

 

Answer Sheet:

 

I certify that I received no help from any person and that all the non-human resources that I used to

 

complete this bonus assignment are summarized with references in the report section of these

 

problems. I further certify that I will turn in any student observed giving or receiving help on this

 

assignment. Signature ________________________________________________________________ Printed Name______________________________________________________________ A (5 points ? Only if part B is also included) On the Schematic Above, label your output node and what

 

values and locations of added capacitors you used.

 

B (15 points) Provide values of resistances for which the transistor is biased into the proper mode for

 

amplification. Support your work with equations and justification for your answer on an attached sheet

 

and summarize your results in the spaces provided below. Your choice of values will affect the gain of

 

your circuit so include your gain analysis in your supporting work. All work should be supported with

 

equations and not merely selected via simulation.

 

R3___________ R4___________ R5____________ R6_____________

 

R7___________ R8___________

 

Voltage gain at the 1 KHz ________________________________

 

IDS1 ___________ IDS2 ___________

 

VGS1 __________ VDS1 __________ VGS2 __________ VDS2 __________

 

C (5 points) Simulate your results in PSPICE showing a graph of the output voltage for a 10 mV input

 

over the frequency range of 1Hz to 100KHz and a transient response at 5 KHz. You must turn in:

 

i) AC response plotted showing your solution meets the bandwidth design criteria (use cursors

 

on your plot for this).

 

ii) The transient response for a 10 mV sinusoidal input voltage showing 10 cycles.

 

iii) No points will be given for this section unless you email the grader me your PSPICE file and

 

unless you use the PSPSICE version from Orcad version 16.6 found at:

 

http://www.cadence.com/products/orcad/Pages/downloads.aspx?gclid=CMWt1ra9070CFWZo7

 

Aod8U0ALw#pspice

 


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