Contents
ECE 440 Lab 1
Experiment 1: Signals and Noise (1 week) (L1.pdf)
I. OBJECTIVES
Upon completion of this experiment, you should be able to:
1. Use the signal generators and filters in the lab to generate and filter noise and various types of periodic signals.
2. Characterize noise and periodic signals in the time and frequency domains by using the 54624A oscilloscope and the 4395A spectrum analyzer respectively.
3. Use the 8922A voltmeter to determine the RMS voltage (or equivalently, the power) of a signal.
II. INTRODUCTION
In this course, you will be studying communication systems and signals, and the effect of noise on these systems. You will frequently need to analyze signals (deterministic and random) in the time and frequency domains. This experiment introduces you to a number of instruments. These instruments include spectrum analyzers for frequency domain analysis, oscilloscopes for time domain analysis, and voltmeters, frequency counters., etc.
III. PRELAB
1. Define average power and root-mean-square value for deterministic signals.
2 State Parseval’s Theorem for periodic signals.
3. Define power, power spectral density, and autocorrelation for deterministic signals. Point out any relation between these. (Equations Only.)
4. Gaussian white noise, perfectly band-limited to 0-10MHz, is passed through a perfectly rectangular filter of bandwidth 18 kHz, gain 3 dB, and center frequency 455 kHz. If the RMS voltage of the input noise is 1 volt, what is the RMS voltage of the output noise?
