PSpice Primer
Switched Capacitor Integrator
One of the most popular topics in analog
signal processing design today is switched capacitor(SC) circuits. A complete
analysis is covered in ECE4220/5220. An SC circuit is a discrete-time without
the use of an A/D or D/A. A background in z-transforms is helpful but not
necessary to understand SC circuits.
This circuit is an SC integrator.
This schematic includes five sources used to test the circuit,
they are shown in the upper-right portion of the schematic.
Most SC circuits require at 2 clock phases. U1 in this
schematic is a two-phase non-overlapping clock generator with inverted
and non-inverted clock outputs. The clock generator can be found in the
clocks library. The circuit is shown as follows.
The output of SC circuits is truly a non-continuous discrete-time
signal. The output signal only needs to be valid during the sample time
of the next stage.
Simulation results:
Step Input
Ramp Input
Square Wave Input
Sawtooth Input
Sine Input
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These pages are maintained by Rich Klinger. raklinge@mail.uccs.edu