Environmental Engineering Reference
In-Depth Information
To demonstrate the analysis of harmonic distortion due to the exis-
tence of nonlinear capacitors, the circuit in Fig.12.4 is considered. The
only nonlinear element is capacitor
modeled by
while remains unchanged. To avoid numerical difficulties, the circuit
is impedance-scaled by and frequency scaled by 100. As a result,
the ON-resistance of MOSFET switches is changed from
to
The capacitance of
is changed from
to
becomes
The clock frequency is changed from 100 kHz to 1000 Hz. The opera-
tional amplifier is modeled as an ideal voltage-controlled voltage source
with gain 1000. The distortion of the output at frequency 100 Hz was
analyzed. For the purpose of comparison, it was also computed using
SPICE. Both results are tabulated in Table 12.11. As can be seen that
the results are in good agreement.
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