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1. WO2000011783 - TUNED BAND-PASS CIRCUIT

Publication Number WO/2000/011783
Publication Date 02.03.2000
International Application No. PCT/EP1999/006164
International Filing Date 23.08.1999
IPC
H03J 5/24 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
5Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
24with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection, for television channel selection
CPC
H03J 3/185
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
3Continuous tuning
02Details
16Tuning without displacement of reactive element, e.g. by varying permeability
18by discharge tube or semiconductor device simulating variable reactance
185with varactors, i.e. voltage variable reactive diodes
H03J 3/26
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
3Continuous tuning
24of more than one resonant circuit simultaneously, the circuits being tuned to substantially the same frequency, e.g. for single-knob tuning
26the circuits being coupled so as to form a bandpass filter
H03J 5/246
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
5Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
24with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection, for television channel selection
246using electronic means
Applicants
  • KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL]/[NL]
Inventors
  • TOH, Yeow, T.
  • CHENG, Sheau, C.
Agents
  • GROENENDAAL, Antonius, W., M.
Priority Data
99200996.930.03.1999EP
PCT/SG98/0006625.08.1998SG
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) TUNED BAND-PASS CIRCUIT
(FR) CIRCUIT PASSE-BANDE ACCORDE
Abstract
(EN)
In a tunable band-pass circuit, comprising a double-tuned tank circuit having a first terminal (T1) coupled (C1) to an input terminal (I) and a second terminal (T2) coupled (Lo) to an output terminal (O), and an image trap capacitance (Ci) coupled between the input terminal (I) and said second terminal (T2), a feedback capacitance (C+), an image feedback capacitance (C+) is coupled between the output terminal (O) and the input terminal (I) to improve image rejection.
(FR)
Dans un circuit de passe-bande accordé, comportant un circuit oscillant final à double accord, possédant une première borne (T1) couplée à une borne d'entrée (I) et une deuxième borne (T2) couplée (Lo) à une borne de sortie (O), et une capacité de piégeage d'image (Ci) couplée entre la borne d'entrée (I) et ladite deuxième borne (T2), une capacité de retour (C+) et une capacité de retour d'image (C+) est couplée entre la borne de sortie (O) et la borne d'entrée (I) de manière que la réjection d'image soit améliorée.
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