Title :
Analog CMOS implementation of high frequency least-mean square error learning circuit
Author :
Kub, Francis J. ; Justh, Eric W.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
fDate :
12/1/1995 12:00:00 AM
Abstract :
A continuous-time analog CMOS circuit with external feedback amplifiers implementing the least-mean square error adaptive learning algorithm has demonstrated a frequency of operation of 80 MHz, an adaptivity of 60 dB, a minimum notch width of 20 kHz, a minimum adapt time constant of 20 μs, and the simultaneous cancellation of two continuous-wave (CW) interferers. Auto-zeroing is used to cancel multiplier and integrator offsets. A fully monolithic adaptive filter circuit was also realized
Keywords :
CMOS analogue integrated circuits; adaptive filters; adaptive signal processing; analogue processing circuits; continuous time systems; feedback amplifiers; interference suppression; learning systems; least mean squares methods; 80 MHz; CW interferers cancellation; LMS error adaptive learning algorithm; analog CMOS implementation; auto-zeroing; continuous-time analog circuit; external feedback amplifiers; high frequency operation; least-mean square error learning circuit; monolithic adaptive filter circuit; offsets cancellation; Adaptive filters; CMOS analog integrated circuits; Feedback amplifiers; Feedback circuits; Frequency; Interference cancellation; Least squares approximation; MOSFET circuits; Narrowband; Signal generators;
Journal_Title :
Solid-State Circuits, IEEE Journal of
