Global Patent Index - EP 0971280 A1

EP 0971280 A1 2000-01-12 - Voltage regulator and method of regulating voltage

Title (en)

Voltage regulator and method of regulating voltage

Title (de)

Spannungsregler und Verfahren zur Spannungsregelung

Title (fr)

Régulateur de tension et méthode pour la régulation de tension

Publication

EP 0971280 A1 (EN)

Application

EP 98401714 A

Priority

EP 98401714 A

Abstract (en)

A voltage regulator (100) for a power amplifier of a portable communications device, comprises an operational amplifier (110) and a power transistor (20) connected together so as to perform a voltage regulation function with the output (113) of the operational amplifier connected to a control terminal (21) of the power transistor (20), wherein the power transistor has an associated capacitance Cgs such that the initial biasing of the power transistor requires a start-up current to be supplied to its control terminal to charge the associated capacitance. The voltage regulator (100) additionally comprises start-up current generation means (200) having a current node (300) connected to the control terminal of the power transistor for supplying additional current to the control terminal of the power transistor during start-up of the regulator whereby the initial biasing of the power transistor (20) is aided by the start-up current generation means (200). <IMAGE>

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

G05F 1/575; G05F 1/565

IPC 8 full level (invention and additional information)

G05F 1/565 (2006.01); G05F 1/575 (2006.01)

CPC (invention and additional information)

G05F 1/565 (2013.01); G05F 1/575 (2013.01)

Citation (search report)

  • [XY] EP 0731553 A2 19960911 - SIEMENS AG [DE]
  • [XA] EP 0749059 A2 19961218 - PHILIPS PATENTVERWALTUNG [DE], et al
  • [YA] KMETZ G L: "SOFT-START REGULATOR STARTS AT OV", EDN ELECTRICAL DESIGN NEWS, vol. 41, no. 12, 6 June 1996 (1996-06-06), pages 104, 106, XP000622006

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

EP 0971280 A1 20000112

INPADOC legal status


2002-08-28 [18D] DEEMED TO BE WITHDRAWN

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- Effective date: 20020201

2000-09-20 [AKX] PAYMENT OF DESIGNATION FEES

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2000-09-06 [17P] REQUEST FOR EXAMINATION FILED

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- Effective date: 20000712

2000-01-12 [AK] DESIGNATED CONTRACTING STATES:

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- Designated State(s): DE FR GB IT

2000-01-12 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

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