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ADVANCED INTEGRATED CIRCUITS

ADVANCED INTEGRATED CIRCUITS. Eugenio Culurciello Spring 2005 Yale University SWITCHED CAPACITORS CIRCUITS. Switched Capacitors are often used in modern analog VLSI: Integrators both for voltages and currents Filters (many more advanced filters have been developed)

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ADVANCED INTEGRATED CIRCUITS

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  1. ADVANCED INTEGRATED CIRCUITS Eugenio Culurciello Spring 2005 Yale University SWITCHED CAPACITORS CIRCUITS

  2. Switched Capacitors are often used in modern analog VLSI: • Integrators both for voltages and currents • Filters (many more advanced filters have been developed) • Operational Amplifiers • Comparators • Noise-reduction circuits (CDS) • Charge pumps • Isolation circuits

  3. Switched Capacitors • Yes, but how do we • implement switches?

  4. Switched Capacitors • And are the switches good? • No! Because of charge • injection due to gate charge • which divides into 2 charges • We need to cancel the added • charge using a compensated • switch – a simple technique!

  5. Switched Capacitors • And are the switches good? • Other compensation techniques: differential signaling • Pay attention to noise in the sampling capacitors! The noise power is kT/C!

  6. Switched Capacitors • Operational Amplifiers • Comparators • Integrators

  7. Switched Capacitors • CDS = noise reduction in image sensors • removes offsets and fixed-pattern noise • Michael will present a paper on this next Thursday • Please remember to read the paper for discussion!

  8. Switched Capacitors • Charge Pumps

  9. Switched Capacitors • Charge Pumps

  10. Switched Capacitors • Isolation Amplifiers

  11. Switched Capacitors • Isolation Amplifiers

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