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1. EP1250758 - BAND PASS FILTER WITH IMPROVED GROUP DELAY

Office
European Patent Office
Application Number 00986392
Application Date 15.12.2000
Publication Number 1250758
Publication Date 23.10.2002
Publication Kind A4
IPC
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 TECH INC
Inventors THOMASSON SAMUEL L
Designated States
Priority Data 0033933 15.12.2000 US
09492015 26.01.2000 US
Title
(DE) BANDPASSFILTER MIT VERBESSERTER GRUPPENLAUFZEIT
(EN) BAND PASS FILTER WITH IMPROVED GROUP DELAY
(FR) FILTRE PASSE-BANDE A TEMPS DE PROPAGATION DE GROUPE AMELIORE
Abstract
(EN) An electrical signal is applied to a band pass filter (42), a first notch filter (43), and a second notch filter (44) 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.
(FR) L'invention concerne un signal électrique appliqué à un filtre passe-bande (42), à un premier filtre coupe-bande (43) et à un second filtre coupe-bande (44), quelque soit l'ordre. Les fréquences centrales des filtres coupe-bande chevauchent la bande passante du filtre passe-bande. Les filtres coupe-bande améliorent le temps de propagation de groupe et accentuent la pente des frontières de la courbe de réponse du filtre passe-bande.
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