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EE6326F08_HW3_Design_Guide - EE6326 Analog IC Design Fall...

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1 1 WLCHEN EE6326 Analog IC Design – Fall 2008 HW#3 Design Guide Wenliang Chen, Ph. D. Instructor
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2 2 WLCHEN Outlines This design guide and class-note-05 are needed as references to complete HW#3. Design Blocks Brokaw Bandgap (architecture can be different.) Constant current references & mirrors IPTAT current references & mirrors Constant Gm current references & mirrors Thermal shut down circuit
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3 3 WLCHEN Design Steps Design a bandgap circuit containing IPTATxR and VBE parts The IPTAT part will be re-used as current reference A start-up circuit is needed Design a constant current reference and mirror An ideal OPAMP is approximated with a “vcvs” ideal voltage source in cadence. VBG and an external zero T.C. R are used to generate constant currents Both current sources and current sinks are required. Design an IPTAT current reference and mirror Re-use it from BG circuit Only current sources are needed Design a constant Gm current reference and mirrors An ideal OPAMP and VBG are used to increase Rout Only current sinks are needed. Design a thermal shut down circuit Tz,h=150C & Tz,l=130C Thermal hysteresis of 20C is achieved by changing sensing-R values.
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4 4 WLCHEN BJT model setup In your UNIX home directory, please make a directory called “models”. Copy “NPN_AE13” into the “models” directory To add a BJT symbol into your schematic “i” Æ “NCSU_Analog_parts” Æ ”N_Transistors” Æ ”npn” Æ drag it to a desired spot in your schematic then left click Æ key in “NPN_AE13” in the Model name and Multiplier number In case changes of NPN_AE13 BJTs are needed, please “Q” the BJT symbol and type in “numbers of BJTs” in the “Multiplier” cell.
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