lab7_DAC_notes

lab7_DAC_notes - ECE 209 Circuits and Electronics...

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Unformatted text preview: ECE 209: Circuits and Electronics Laboratory Notes for Lab 7 (Digital-to-Analog (D/A) Application) 1. Digital-to-analog converter (DAC) — “1 least significant bit (LSB)” defines Smallest output step possible • Now, signals are generated by a computer as codes separated by intervals of time. • To use those signals in the physical world, need to convert those abstract codes to voltages. • When codes are in binary, each bit can electronically control a switch (e.g., a transistor ); those switches turn on and off currents into summing junction formed by operational amplifier. – Amplifier gain changes output scale — “clicking” heard in function generators (50 Ω output?). – Modern DAC’s use more complicated schemes. “1-bit DAC” technologies pulse modulate. * Switches (as opposed to analog amp.) burn negligible power (wall switches vs. dimmers). * Increase “number of bits” by increasing samples per second (no extra hardware)....
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This note was uploaded on 08/05/2011 for the course ECE 209 taught by Professor Staff during the Fall '08 term at Ohio State.

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