ELEC376 Report Writing Assessment

PART-1: MIXER SIMULATION
PRE-LAB1
A1. Write down the expanded equation for the square wave (in blue) shown in Figure-1 up to 5 terms.

Simple mixer
(b1) The output is taken at the collector of Q1. Observe the output signal in the time domain and find out the various frequency components in the output using FFT.
(c1) Focus on the first five frequency components in FFT and explain where each of them may originate from.

Advanced mixer
(d1) Implement the circuit shown in figure3. Give LO =50KHz, 1V peak and RF=5KHz 1V peak.

(e1) Identify the current source, differential pair and buffer in the circuit.
(f1) Check for the mixed signals of the first order.

(g1) Imagine you have an input signal of 5KHz as before and you need to double that frequency, modify the circuit so that you have a frequency doubler.