Global Patent Index - EP 0981203 A1

EP 0981203 A1 2000-02-23 - Fast switching, controlled current source

Title (en)

Fast switching, controlled current source

Title (de)

Gesteuerte Stromquelle mit beschleunigtem Umschalten

Title (fr)

Source de courant contrôlée à commutation accélérée

Publication

EP 0981203 A1 (FR)

Application

EP 99202607 A

Priority

FR 9810509 A

Abstract (en)

The source of controlled current (CSi) receives a control signal (Vi) and delivers a current (IOi) at its output; It comprises a power module (PAi) containing a set of transistors connected in parallel with collectors, connected to the output, and a control module (CNTi) with output connected to emitters for setting the transistors in conducting state in response to the control signal; it also contains a set of 3 diodes (D1i,D2i,D3i) connected in series with a resistor (Rdi), so that the voltage between emitter and base is 3 times the voltage drop on one diode minus the voltage generated by the control module. In a preferred embodiment, the control module (CNT1) comprises a first differential pair of transistors with bases connected to receive a control signal, a third transistor in series with a resistor in path of the main current, and a second differential pair of transistors with bases connected to receive a selection signal. Independent claims are included for a charge pump comprising two sources of controlled current (CS1,CS2) connected to a current mirror formed by a pair of power transistors, and for a radio receiver with frequency controlled by a PLL with such a charge pump.

Abstract (fr)

La présente invention concerne une source de courant contrôlée CSi destinée à recevoir un signal de commande Vi, et destinée à délivrer sur une sortie OUTi un courant IOi, comprenant : un module de puissance PAi comprenant une pluralité de transistors disposés en parallèle, dont les collecteurs sont reliés ensemble à la sortie de la source de courant CS1, et un module de contrôle CNTi, destiné à recevoir le signal de commande Vi, et d'une sortie destinée à délivrer un signal permettant la mise en conduction des transistors de puissance. Selon l'invention, les émetteurs des transistors de puissance sont reliés ensemble à la sortie du module de contrôle CNTi, ladite sortie étant destinée à délivrer un courant Ii dont la valeur dépend de la valeur du signal de commande Vi, les bases des transistors de puissance étant soumises en permanence à une tension de valeur prédéterminée permettant de rendre lesdits transistors de puissance potentiellement conducteurs. L'invention permet, par un pré-chargement des capacités parasites des transistors de puissance, d'accélérer l'entrée en conduction desdits transistors. Application :: Boucles à verrouillage de phase pour récepteurs de signaux radioélectriques. <IMAGE>

IPC 1-7 (main, further and additional classification)

H03L 7/089; G05F 3/20; H03L 7/107

IPC 8 full level (invention and additional information)

G05F 3/26 (2006.01); G05F 3/20 (2006.01); G05F 3/22 (2006.01); H02M 3/07 (2006.01); H03L 7/093 (2006.01)

CPC (invention and additional information)

G05F 3/20 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 0981203 A1 20000223; EP 0981203 B1 20040121; DE 69914266 D1 20040226; DE 69914266 T2 20041118; JP 2000200111 A 20000718; KR 20000017372 A 20000325; US 6150806 A 20001121

INPADOC legal status


2006-05-26 [REG FR ST] NOTIFICATION OF LAPSE

- Effective date: 20060428

2006-04-28 [PG25 FR] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2006-04-26 [GBPC] GB: EUROPEAN PATENT CEASED THROUGH NON-PAYMENT OF RENEWAL FEE

- Effective date: 20050810

2006-03-01 [PG25 DE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2005-08-10 [PG25 GB] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2004-04-28 [GBT] GB: TRANSLATION OF EP PATENT FILED (GB SECTION 77(6)(A)/1977)

- Effective date: 20040407

2004-02-26 [REF] CORRESPONDS TO:

- Document: DE 69914266 P 20040226

2004-01-21 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE FR GB

2004-01-21 [REG GB FG4D] EUROPEAN PATENT GRANTED

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2002-10-30 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020916

2000-11-08 [AKX] PAYMENT OF DESIGNATION FEES

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2000-10-18 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000823

2000-02-23 [AK] DESIGNATED CONTRACTING STATES:

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- Designated State(s): DE FR GB

2000-02-23 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

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