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lab7_DAC_notes - ECE 209 Circuits and Electronics...

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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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