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Audio DAC Matt Smith Alfred Wanga CSE598A/EE597G Analog-Digital Mixed-Signal CMOS Chip Design Spring 2006
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Digital audio has become widespread in home/consumer electronics Portable Music Players (CD, SACD, MP3) PC Audio (Sony/Philips Digital Interface Format) Home Theater Systems (DVD, Optical Interconnects) Digital Audio
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Design Philosophy - Goals High Quality Audio Applications Accurate Reproduction Low Noise Versatile Support for Standard Sampling Rates Specifications that allow use in Various Audio Applications
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Figures of Merit Sampling Rate Support common sampling speeds (96kHz) Bit Depth Finer Resolution → Better fidelity (>= 16bit) Total Harmonic Distortion + Noise (THD+N) Important for audio applications (< 1% THD+N) Signal to Noise Ratio (SNR) Equal or better than digital source (>= 100dB)
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Voltage-output thermometer DAC Current-output thermometer DAC Binary-weighted DAC R-2R DAC Requires 2 n identical resistors Requires 2 n -1 identical resistors Requires 2 n unique current sources Challenge: Requires precise resistors to get LSB resolution DAC Architecture
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Current-output Voltage-output Output buffer required to provide low output resistance Output voltage swing limited by op-amp Output voltage limited to 1/3 V ref R-2R DAC
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Project Schedule Week #1 (2/5 – 2/11) Finalize design goals and specifications Week #2 (2/12 – 2/18) Finalize and test inverter and buffer Week #3 (2/19 – 2/25) Finalize and test digital components (latches, gates)
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Project Schedule Week #4 (2/26 – 3/4) Begin operational amplifier design Week #5 (3/5 – 3/11) Finalize design for operational amplifier Week #6 (3/12 – 3/18) Finalize resistor design Project Progress Report
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Project Schedule Week #7 (3/19 – 3/25) Finalize and test voltage reference circuitry Week #8 (3/26 – 4/1) Complete final circuit design and layout Week #9 (4/2 – 4/8) Complete circuit layout and testing Week #10 (4/9 – 4/13) Final Project Presentation
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