Baker Ch. 18 Special Purpose CMOS Circuits …

Introduction to VLSIJ oseph A. Elias, Adjunct Professor, University of Kentucky; Modeling Principal, Cypress Semiconductor1 Baker Ch. 18 special purpose cmos circuits Chapter 18 special purpose cmos circuits Schmitt Trigger Mutlivibrator Circuits Monostable Astable Input Buffers Differential DC Reference Reducing Buffer Input Resistance Charge Pumps Dickson PumpIntroduction to VLSIJ oseph A. Elias, Adjunct Professor, University of Kentucky; Modeling Principal, Cypress Semiconductor2 Baker Ch. 18 special purpose cmos circuits Schmitt Trigger DESCRIPTION OUTPUT=L WHEN INPUT > VSPH OUTPUT=H WHEN INPUT < VSPL HYSTERESIS: VH= VSPH VSPL START ANALYSIS WITH OUTPUT OUTPUT=L: M6 ON, M3 OFF, PCHANNEL CKT OUTPUT=H: M3 ON, M6 OFF, NCHANNEL CKTHYSTERESIS0X1X10 Introduction to VLSIJ oseph A. Elias, Adjunct Professor, University of Kentucky; Modeling Principal, Cypress Semiconductor3 Baker Ch. 18 special purpose cmos circuits Schmitt Trigger CALCULATING VSPH OUT=1, 0< VIN<Vtn1 M3 ON, M1, M2 OFF, M3 S=VDD-Vtn3 VIN Vtn M1 ON, M1 S 0 VIN> Vtn AS M1 D 0, VGS>Vtn, M2 ON AS M2 ON, OUT 0, M3 OFF VIN= VSPH= VTN2+ VX CURRENT IN M1, M3 EQUAL SOURCES SAME M2, M3 VTN2=VTN3 1/2 (VSPH-VTN1)2= 3/2 (VDD-VX-VTN3)2 1/ 2= (W1L3)/(L1W3) = [ {VDD - VSPH} / {VSPH- VTN} ]2IN<VtnXX1Vx = VDD-Vtn3IN~VtnX1Vx = VDD-Vtn3 GNDIN>Vtn1 0Vx = GND1 GNDXI ntroduction to VLSIJ oseph A.

Introduction to VLSI Joseph A. Elias, Ph.D. Adjunct Professor, University of Kentucky; Modeling Principal, Cypress Semiconductor 3 Baker Ch. 18 Special Purpose CMOS Circuits

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