lec25_handout

lec25_handout - From last time Bridge circuits! + Vs VO...

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ME365 Carrier Systems 1 From last time… Bridge circuits! Potentiometer Capacitive Displacement Sensor Inductive Displacement Sensor V O ܸ ܼ ܼ െܼ ܼ ܼ ൅ܼ ܼ ൅ܼ ܸ ܸ 1 1൅ ܴ ܴ ݔ 1െݔ ݔܸ ܸ ൌܭ ܸ ܺ ஽஼ sin ߱ ݐ൅ ܺ 2 sin ߱ െ߱ ݐ൅ ܺ 2 sin ߱ ൅߱ ݐ ܸ ൌܭ ܸ ܺ ஽஼ sin ߱ ݐ൅ ܺ 2 sin ߱ െ߱ ݐ൅ ܺ 2 sin ߱ ൅߱ ݐ V s + ME365 Carrier Systems 2 Modulation Modulation - Carrier Systems Amplitude Modulation Demodulation
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ME365 Carrier Systems 3 Modulation - Carrier Systems Modulation – Using a low frequency or base-band signal (voice, distance measurement, …) to modify a high frequency carrier signal . –A d v a n t a g e s : • Telemetry signal transmission • Multiplexing - multiple signals may be transmitted on the same channel. • Capacitive or inductive devices require high frequency AC input (carrier) to operate. • Stability and noise rejection ME365 Carrier Systems 4 Modulation - Carrier Systems No wires
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ME365 Carrier Systems 5 Modulation - Carrier Systems Types of Modulation – In the modulation process, some characteristic of a high- frequency sinusoidal carrier signal,
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lec25_handout - From last time Bridge circuits! + Vs VO...

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