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L12 Capacitors

L12 Capacitors - EE 40 Capacitors EE 40 Lecture 12...

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EE 40 Capacitors EE 40 Lecture 12: Capacitors 1
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Beyond Resistive Circuits What we can do Sensor interfaces: high input resistance, gain, low impedance drive, level shift, … E.g. strain, light, pressure, temperature, humidity sensor, microphone, headset amplifier, … But we cannot build & understand, e.g., the following with just resistors, amplifiers, and sources: Timer circuit Voltage doubler Explain finite speed of real circuits Any kind of memory we need some form of “memory” EE 40 Lecture 12: Capacitors 2
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Capacitor “Bucket” for Electrons EE 40 Lecture 12: Capacitors 3
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Capacitor EE 40 Lecture 12: Capacitors 4
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Capacitor EE 40 Lecture 12: Capacitors 5 V > 0 +2q e -2q e q e = +1.6 x 10 -19 C
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“Ohm’s Law” for Capacitors EE 40 Lecture 12: Capacitors 6 Q = C V Capacitance C [Farad] [F] Typical values: On-chip capacitor: 5 fF PCB stray caps: 1 pF Supercapacitor: 5 F
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Real Capacitors EE 40 Lecture 12: Capacitors 7 http://tp01.com/etutorials/images/capacitors01.jpg http://www.scienceprog.com/wp- content/uploads/2006i/SMD_SMT/SMD_capacitors.jpg
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