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Download Introduction to switched-capacitor circuits
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Transcript
Introduction to SwitchedCapacitor Circuits Sections 14.1 & 14.2 Integrated Circuit Capacitors Chapter 14 Figure 1 Parasitic capacitances associated with an integrated circuit capacitor are often no symmetric, as indicated by the schematic symbol above CMOS Switches Chapter 14 Figure 2: Switch symbol and some transistor circuits: (a) symbol, (b) n-channel switch, (c) p–channel switch, (d) transmission gate. Basic Switched Capacitor Chapter 14 Figure 4: Resistor equivalence of a switched capacitor. (a) Switched-capacitor circuit, and (b) resistor equivalent. Example • C1 = 5pF, fs = 100kHz Req = 1/(5e12*100e3) = 2MW!! • Very large value • Controllable by changing the clock frequency Non-overlapping clocks • Must avoid the situation where both switches are closed simultaneously Simple Switched-Capacitor Integrator (not used) Simple Switched-Capacitor Integrator (not used) Simple Switched-Capacitor Integrator (not used) Simple Switched-Capacitor Integrator (not used) • Integrator gain depends upon ratio of capacitor values • Operation is analogous to a continuous-time active RC integrator with respect to input frequencies >> fs Practical integrated circuit capacitors • Parasitics Cp1,2 are not well controlled and are difficult to predict Impact of parasitics on the integrator • Gain is no longer accurate & well controlled (Noninverting) Delayed Switched-Capacitor Integrator (Noninverting) Delayed Switched-Capacitor Integrator (Inverting) Delay-Free Switched-Capacitor Integrator (Inverting) Delay-Free Switched-Capacitor Integrator (Inverting) Delay-Free Switched-Capacitor Integrator Signal Flow Graph Analysis
