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1. (WO2001006637) ADJUSTABLE FILTER
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2001/006637 International Application No.: PCT/GB2000/002759
Publication Date: 25.01.2001 International Filing Date: 18.07.2000
Chapter 2 Demand Filed: 19.02.2001
IPC:
H03B 1/00 (2006.01) ,H03B 5/12 (2006.01) ,H03J 3/08 (2006.01)
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
B
GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
1
Details
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
B
GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
5
Generation of oscillations using amplifier with regenerative feedback from output to input
08
with frequency-determining element comprising lumped inductance and capacitance
12
active element in amplifier being semiconductor device
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
J
TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
3
Continuous tuning
02
Details
06
Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
08
by varying a second parameter simultaneously with the tuning, e.g. coupling bandpass filter
Applicants: COLLIER, James, Digby, Yarlet[GB/GB]; GB (UsOnly)
SABBERTON, Ian, Michael[GB/GB]; GB (UsOnly)
CAMBRIDGE SILICON RADIO LTD.[GB/GB]; Unit 300 Science Park Milton Road Cambridge CB4 0XL, GB (AllExceptUS)
Inventors: COLLIER, James, Digby, Yarlet; GB
SABBERTON, Ian, Michael; GB
Agent: SLINGSBY, Philip, Roy ; Page White & Farrer 54 Doughty Street London WC1N 2LS, GB
Priority Data:
9916901.319.07.1999GB
Title (EN) ADJUSTABLE FILTER
(FR) FILTRE REGLABLE
Abstract:
(EN) A radio transmitter and/or receiver comprising: an oscillator tuning circuit comprising an adjustable capacitor whose capacitance is adjustable my means of a first tuning signal; a filter tuning circuit comprising an adjustable capacitor whose capacitance is adjustable by means of a second tuning signal; an oscillator whose operational frequency is dependant on the reactance of the oscillator tuning circuit; a filter for filtering signals in the course of transmission and/or reception, and whose response is dependant on the reactance of the filter tuning circuit; and a tuning unit for generating the first and second tuning signals; wherein at least a part of the filter tuning circuit is a replica of at least a part of the oscillator tuning circuit and the tuning circuit is capable of generating one of the first and second tuning signals in dependence on the other of the tuning signals.
(FR) L'invention concerne un émetteur et/ou récepteur radio qui comprend : un circuit d'accord d'oscillateur comprenant un condensateur réglable dont la capacité est réglable au moyen d'un premier signal d'accord ; un circuit d'accord de filtre comprenant un condensateur réglable dont la capacité est réglable au moyen d'un second signal d'accord ; un oscillateur dont la fréquence de fonctionnement dépend de la réaction du circuit d'accord d'oscillateur ; un filtre permettant de filtrer les signaux en cours d'émission et/ou de réception, et dont la réponse dépend de la réaction du circuit d'accord de filtre ; et une bloc d'accord permettant d'émettre le premier et le second signaux d'accord. Au moins une partie du circuit d'accord de filtre est une réplique d'au moins une partie du circuit d'accord d'oscillateur, le circuit d'accord étant capable d'émettre l'un des deux signaux d'accord en fonction de l'autre signal d'accord.
front page image
Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CR, CU, CZ, DE, DK, DM, DZ, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, US, UZ, VN, YU, ZA, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (EPO) (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)