L13 SC Circuits

L13 SC Circuits - unknown , Discharge C ref EE 40 Lecture...

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EE 40 Switched Capacitor Circuits EE 40 Lecture 13: SC Circuits 1
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Reservoirs Capacitor Water Cup EE 40 Lecture 13: SC Circuits 2
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Conservation Charge Water EE 40 Lecture 13: SC Circuits 3
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Measure Capacitance “Measure Size of Cup” EE 40 Lecture 13: SC Circuits 4 Unknown size Reference cup Known size Objective: Determine unknown cup size (without “lifting” water) Applications: touch sensor, fluid level sensor, electronic level, acceleration sensor, …
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Measure Size of Cup EE 40 Lecture 13: SC Circuits 5 1) Fill to known level empty
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Measure Size of Cup EE 40 Lecture 13: SC Circuits 6 2) distribute
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Measure Size of Cup EE 40 Lecture 13: SC Circuits 7 3) empty
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Measure Size of Cup EE 40 Lecture 13: SC Circuits 8 4) Repeat steps 2 & 3 until fluid level drops to 50 % of full 5) Number of steps is measure of unknown size Full 50 %
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Measure Capacitor Value Water Cup Cup of unknown size Reference cup (small) Operations Fill unknown Empty reference Join cups Capacitor EE 40 Lecture 13: SC Circuits 9
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Circuit to Measure C unknown EE 40 Lecture 13: SC Circuits 10
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1) Charge C
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Unformatted text preview: unknown , Discharge C ref EE 40 Lecture 13: SC Circuits 11 2) Distribute Charge EE 40 Lecture 13: SC Circuits 12 3) Discharge C ref EE 40 Lecture 13: SC Circuits 13 4) Repeat 2+3 until v c1 = 0.5 V ref EE 40 Lecture 13: SC Circuits 14 Digital-to-Analog Converter (DAC) EE 40 Lecture 13: SC Circuits 15 Bits (VDD & VSS) Continuous Voltage e.g. 0 … 5V in small increments Digital-to-Analog Conversion EE 40 Lecture 13: SC Circuits 16 V digital_0 time v analog N digital V digital_1 V digital_i Charge-Based DAC EE 40 Lecture 13: SC Circuits 17 C i = 2 i C Charge-Based DAC: reset phase EE 40 Lecture 13: SC Circuits 18 C i = 2 i C b = 1001 Q tot = Charge-Based DAC: conversion phase EE 40 Lecture 13: SC Circuits 19 C i = 2 i C b = 1001 C tot = v out = Analog-to-Digital Converter • 1954 "DATRAC" 11-Bit, 50-ks/s SAR ADC • Today: 18 bit, 10Ms/s EE 40 Lecture 13: SC Circuits 20 Skills • Analyze switched capacitor (SC) circuits • Draw equivalent circuit for each switching phase • Determine capacitor voltage using charge conservation EE 40 Lecture 13: SC Circuits 21...
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This note was uploaded on 01/15/2011 for the course EE 40 taught by Professor Chang-hasnain during the Spring '07 term at Berkeley.

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L13 SC Circuits - unknown , Discharge C ref EE 40 Lecture...

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