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by: Mrs. Lacy Schneider
Mrs. Lacy Schneider

GPA 3.9


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Class Notes
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This 1 page Class Notes was uploaded by Mrs. Lacy Schneider on Thursday October 29, 2015. The Class Notes belongs to ECEN 5837 at University of Colorado at Boulder taught by Staff in Fall. Since its upload, it has received 23 views. For similar materials see /class/231794/ecen-5837-university-of-colorado-at-boulder in ELECTRICAL AND COMPUTER ENGINEERING at University of Colorado at Boulder.



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Date Created: 10/29/15
ECEN 583 7 Current steering DAC 1 3 Bit Current Steering DAC Design a 3bit DAC based on identical current mirrors thermometer code and differential switch cells based on the following speci cations 0 Maximum conversion time Tcimax 100 ns 0 Output voltage settled to within 05 LSB of the ideal output Vt7 2b1b01V 2 4 8 0 Output based on selection of seven identical current outputs ie use a thermometer code to select output currents 0 IO binary input word b2 b1 b0 output voltage V0 and power supplies With the following design constraints 0 Power supplies Vdd 33V Vss 0V 0 Place two resistors in your design one for generating the bias current and one for converting the output current to an output voltage Use as many nmos and pmos devices as desired Procedure 0 Design the 3bit DAC according to the speci cations and constraints If desired Verilog code may be used initially for converting the binary input to thermometer code An example for 4 bits is given in the ams750077ref library 0 Modify the 4bit dacitsti x test xture cell in the ams750077ref library to perform an automated check of your 3bit DAC for offset and gain error INL and DNL Test your DAC using the test xture and modify your design if needed Complete your design with full schematic and layout including digital logic for binary to thermometer cell 0 Test your extracted DAC with the test xture Turn in 0 Complete schematics and layout with results showing LVS clean specify operating directory and leave DRC check le in your directory 0 Transient response with lOOns conversion time steps sequencing through all inputs from 0 to 7 showing the output voltage and thermometer code drive signals 0 Text output from test xture output le showing offset and gain errors data from each input and INL and DNL errors 0 Answer the following questions 0 Based on your measured results what is the maximum number of bits you could achieve in your DAC by simply increasing the number of your current output cells Explain o What is the maximum frequency for your input data 2006R Zane University ofCOIorado atBoulder


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