Lecture 5 Digital Scopes and Signal Fidelity Spr2010

Lecture 5 Digital Scopes and Signal Fidelity Spr2010 -...

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Unformatted text preview: Spring 2010 Mat 288S Optoelectronic Measurements 1 Digital Scopes and Signal Fidelity Time domain measurements Pulse generators Digital sampling oscilloscopes Transmission lines and impedance matching Lab exercise Time Domain Measurements Spring 2010 Mat 288S Optoelectronic Measurements 2 Pulsed LIV measurements avoid heating 10-100 ns duty cycle (pulse width/period) < 1% Carrier lifetime from transient PL 100fs 1ns Modulation characteristics and eye diagrams 10ps 1ns Spring 2010 Mat 288S Optoelectronic Measurements 3 Pulse Generators Waveforms: sine, triangle, sawtooth, square, pulse Frequency/ repetition rate/ period Duty cycle = pulse width/period Amplitude and offset Trigger modes: continuous, external, gate Output impedance, rise and fall times, jitter Tolerance to load mismatch Spring 2010 Mat 288S Optoelectronic Measurements 4 Digital Sampling Oscilloscopes Sampling and the Nyquist Theorem Sampling rate and bandwidth Front-end bandwidth Triggering and memory Spring 2010 Mat 288S Optoelectronic Measurements 5 Analog Oscilloscope Spring 2010 Mat 288S Optoelectronic Measurements 6 Digital Sampling Oscilloscope Advantages over analog scopes: Higher bandwidth Smaller, cheaper Advanced signal analysis Spring 2010 Mat 288S Optoelectronic Measurements 7 Real-time Sampling Acquisition of single event Expensive to implement 1 2 3 4 5 6 7 8 9 10 11 Sample # Spring 2010...
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This note was uploaded on 02/02/2011 for the course ECE 227A taught by Professor Coldren during the Spring '08 term at UCSB.

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Lecture 5 Digital Scopes and Signal Fidelity Spr2010 -...

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