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1. WO2002019050 - CURRENT MIRROR CIRCUIT

Publication Number WO/2002/019050
Publication Date 07.03.2002
International Application No. PCT/EP2001/010110
International Filing Date 29.08.2001
IPC
G05F 3/26 2006.01
GPHYSICS
05CONTROLLING; REGULATING
FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
3Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
02Regulating voltage or current
08wherein the variable is dc
10using uncontrolled devices with non-linear characteristics
16being semiconductor devices
20using diode-transistor combinations
26Current mirrors
CPC
G05F 3/265
GPHYSICS
05CONTROLLING; REGULATING
FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
3Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
02Regulating voltage or current
08wherein the variable is dc
10using uncontrolled devices with non-linear characteristics
16being semiconductor devices
20using diode- transistor combinations
26Current mirrors
265using bipolar transistors only
G05F 3/267
GPHYSICS
05CONTROLLING; REGULATING
FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
3Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
02Regulating voltage or current
08wherein the variable is dc
10using uncontrolled devices with non-linear characteristics
16being semiconductor devices
20using diode- transistor combinations
26Current mirrors
267using both bipolar and field-effect technology
Applicants
  • KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL]/[NL]
Inventors
  • VOORMAN, Johannes, O.
  • DE JONG, Gerben, W.
  • WAFFAOUI EL, Rachid
Agents
  • DE JONG, Durk, J.
Priority Data
00203033.601.09.2000EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CURRENT MIRROR CIRCUIT
(FR) CIRCUIT MIROIR DE COURANT
Abstract
(EN)
A current mirror circuit is described which includes a current input terminal (14A), a current output terminal (14B) and a common terminal (14C). A first controllable semiconductor element (T1) is arranged between the current input terminal (14A) and the common terminal (14C). A second controllable semiconductor element (T2) is arranged between the current output terminal (14B) and the common terminal (14C). The controllable semiconductor elements (T1, T2) havie interconnected control electrodes (T1A, T2A) which are also coupled to a bias voltage source (VBIAS), for biasing said control electrodes at a reference voltage. The circuit further includes a transconductance stage (12) with an input (12A) coupled to the current input terminal (14A) and an output (12B) coupled to the common terminal (14C). The control electrodes (T1A, T2A) are coupled to the common terminal (14C) via a third controllable semiconductor element (T3). The bias voltage source (VBIAS) is coupled to the control electrodes of the first and the second controllable semiconductor element (T1, T2) via a control electrode (T3A) of the third controllable semiconductor element (T3). The current mirror circuit has a high bandwidth also at low input currents and is very suitable for application in an arrangement for reproducing an optical record carrier.
(FR)
L'invention se rapporte à un circuit miroir de courant comportant une borne d'entrée du courant (14A), une borne de sortie du courant (14B) et une borne commune (14C). Un premier élément semi-conducteur commandé (T1) est disposé entre la borne d'entrée du courant (14A) et la borne commune (14C). Un second élément conducteur commandé (T2) est disposé entre la borne de sortie du courant (14B) et la borne commune (14C). Les éléments semi-conducteurs commandés (T1, T2) possèdent des électrodes de commande interconnectés (T1A, T2A) qui sont également couplés à une source de tension de polarisation (VPOLARISATION) permettant de polariser lesdites électrodes de commande à une tension de référence. Le circuit comporte également un étage de transconductance (12) ayant une entrée (12A) couplée à la borne d'entrée du courant (14A) et une sortie (12B) couplée à la borne commune (14C). Les électrodes de commande (T1A, T2A) sont couplées à la borne commune (14C) par l'intermédiaire d'un troisième élément semi-conducteur commandé (T3). La source de tension de polarisation (VPOLARISATION) est couplée aux électrodes de commande des premier et deuxième éléments semi-conducteurs commandés (T1, T2) par l'intermédiaire d'une électrode de commande (T3A) du troisième élément semi-conducteur commandé (T3). Ce circuit miroir de courant possède une large bande passante, même pour des courants d'entrée de faible intensité, et il est parfaitement adapté à une utilisation dans un système permettant la lecture de supports d'enregistrements optiques.
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