EP 0981203 B1 20040121 - 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
Application
Priority
FR 9810509 A 19980818
Abstract (en)
[origin: EP0981203A1] 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.
IPC 1-7
IPC 8 full level
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 (source: EP KR US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
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
DOCDB simple family (application)
EP 99202607 A 19990810; DE 69914266 T 19990810; JP 23094399 A 19990817; KR 19990034134 A 19990818; US 37686299 A 19990818