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Analog Communication Circuits - Assignment | ECE 431, Assignments of Electrical and Electronics Engineering

University of Illinois - ChicagoElectrical and Electronics Engineering
Prof. Vladimir Goncharoff

Material Type: Assignment; Professor: Goncharoff; Class: Analog Communication Circuits; Subject: Electrical and Computer Engr; University: University of Illinois - Chicago; Term: Summer 2005;

Typology: Assignments

Pre 2010

Uploaded on 07/23/2009

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©2005 University of Illinois at Chicago ECE431 V. Goncharoff Homework #9
ECE 431 – Homework #6, due Tuesday 11/7/06
1. In the Gilbert Cell mixer circuit drawn below, assume that the sine voltage
sources )22cos(1)(
1tMHzmVtV
⋅
⋅
⋅=
π
and )5.12cos(1)(
4tMHzmVtV
⋅
⋅
⋅
=
π
.
Find )(tvout , the voltage at the collector of Q3. Show all work (citing results
of derivations done during lectures when needed).
2. What must capacitor C3 value be in order for this circuit to output the other
mixing product term?
3. Simulate this circuit in PSpice. Plot the output voltage waveform using the
following transient analysis settings:
Step Ceiling: 0.01usec, No-Print Delay: 1000usec, Final Time: 1100usec.

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© 2005 University of Illinois at Chicago ECE431 V. Goncharoff Homework #

ECE 431 – Homework #6, due Tuesday 11/7/

  1. In the Gilbert Cell mixer circuit drawn below, assume that the sine voltage

sources V 1 ( t )= 1 mV ⋅cos( 2 π ⋅ 2 MHz ⋅ t )and V 4 ( t )= 1 mV ⋅cos( 2 π ⋅ 1. 5 MHz ⋅ t ).

Find vout ( t ), the voltage at the collector of Q3. Show all work (citing results of derivations done during lectures when needed).

  1. What must capacitor C3 value be in order for this circuit to output the other mixing product term?
  2. Simulate this circuit in PSpice. Plot the output voltage waveform using the following transient analysis settings:

Step Ceiling: 0.01usec , No-Print Delay: 1000usec , Final Time: 1100usec.