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1. US20020000874 - Band pass filter with improved group delay

Office
United States of America
Application Number 09492015
Application Date 26.01.2000
Publication Number 20020000874
Publication Date 03.01.2002
Grant Number 6404279
Grant Date 11.06.2002
Publication Kind B2
IPC
H03K 5/00
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
5Manipulation of pulses not covered by one of the other main groups of this subclass
H03H 11/04
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
11Networks using active elements
02Multiple-port networks
04Frequency selective two-port networks
H03H 11/12
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
11Networks using active elements
02Multiple-port networks
04Frequency selective two-port networks
12using amplifiers with feedback
H03H 17/04
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
17Networks using digital techniques
02Frequency-selective networks
04Recursive filters
H03H 19/00
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
19Networks using time-varying elements, e.g. N-path filters
CPC
H03H 11/126
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
11Networks using active elements
02Multiple-port networks
04Frequency selective two-port networks
12using amplifiers with feedback
126using a single operational amplifier
H03H 11/1295
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
11Networks using active elements
02Multiple-port networks
04Frequency selective two-port networks
12using amplifiers with feedback
1295Parallel-T filters
H03H 17/04
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
17Networks using digital techniques
02Frequency selective networks
04Recursive filters
Applicants Acoustic Technologies, Inc.
Inventors Thomasson, Samuel L.
Agents Wille, Paul F.
Priority Data 09492015 26.01.2000 US
Title
(EN) Band pass filter with improved group delay
Abstract
(EN)

An electrical signal is applied to a band pass filter, a first notch filter, and a second notch filter in any order. The center frequencies of the notch filters straddle the pass band of the band pass filter. The notch filters improve group delay and steepen the skirts of the response curve of the band pass filter.


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