Summary: 748 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS--I: REGULAR PAPERS, VOL. 51, NO. 4, APRIL 2004
Effects of UHF Stimulus and Negative
Feedback on Nonlinear Circuits
Renato Mariz de Moraes and Steven Mark Anlage, Member, IEEE
Abstract--We investigate the combined effect of rectification
and nonlinear dynamics on the behavior of several simple non-
linear circuits. We consider the classic resistor-inductor-diode
(RLD) circuit driven by a low-frequency (LF) source when an op-
erational amplifier with negative feedback is added to the circuit.
Ultra-high-frequency (UHF) signals are applied to the circuit,
causing significant changes in the onset of LF period doubling
and chaos. Measurements indicate that this effect is associated
with a dc voltage induced by rectification of the UHF signal in
the circuit. The combination of rectification and nonlinear circuit
dynamics produce qualitatively new behavior, which opens up a
new channel of radio frequency interference in circuits.
Index Terms--Bifurcations, chaos, diodes, electromagnetic in-
terference (EMI), nonlinear circuits, operational amplifiers, period
doubling, radio frequency interference (RFI), rectification.