Adaptive active analog band-pass filter with zero phase and temp shifts

Application Number: 00108479
Application Date: 2000.06.08
Publication Number: 1328380
Publication Date: 2001.12.26
Priority Information:
International: H03H11/00
Applicant(s) Name: Fu Xuetao
Inventor(s) Name: Fu Xuetao
Patent Agency Code: 00000
Patent Agent:
Abstract An adaptive active analog band-pass filter without phase shift and temp shift is composed of base wave input device, voltage controlled active analog band-pass filter, 90 deg. phase shifter, analog multiplier, integrator of main control loop, auxiliary channel (base-band low-pass filter, amplifier, limiter, shaper and switch control signal generator), self-zero-correcting integrator for multiplier in auxiliary channel and electronic switch. The use of auxiliary channel can prevent the temp shift of analog multiplier as phase detector.