Abstract:
El primer circuito comprende una etapa de entrada para dividir una corriente de entrada en dos o más corrientes de salida, etapa gue comprende una etapa de base/puerta común formada por una pluralidad de transistores Q o ,... Q n dispuestos formando dos o más grupos de manera gue cada uno de ellos proporciona, en un respectivo nodo de salida a, b, una de las dos o más señales de corriente de salida. Para una realización preferida comprende además espejos de alta y baja ganancia conectados, respectivamente, al nodo de salida a del primer grupo y al nodo de salida b del segundo grupo, comprendiendo el espejo de corriente de alta ganancia un circuito de control para prevenir el mal funcionamiento de la etapa de base/puerta común en caso de altas corrientes de entrada.
Abstract:
In one embodiment, an apparatus includes a first transistor where the base of the first transistor is coupled to an input node. A second transistor is provided where the emitter of the first transistor is coupled to the base of the second transistor and the emitter of the second transistor is coupled to an output node. A third transistor is provided where the base of the third transistor is coupled to the input node. A fourth transistor is provided where the emitter of the third transistor is coupled to the base of the fourth transistor and the emitter of the fourth transistor is coupled to the output node and the base of the second transistor is coupled to the base of the fourth transistor. The base of the second transistor is coupled to the base of the fourth transistor through a shorting link.
Abstract:
A cascoded current mirror (11) wherein provision is made for connection, such a buffering connection (17, 19), between the cascode portions (23, 13) of the current mirror (11) to provide feedback between such portions.
Abstract:
A current mirror arrangement is described, comprising: an input current path comprising a main current path of a first current mirror transistor and a transistor connected thereto in a cascode configuration and referred to as first cascode transistor; an output current path comprising a main current path of a second current mirror transistor and a transistor connected thereto in a cascode configuration and referred to as second cascode transistor, and a current splitting circuit for deriving a part of a current from the first circuit point in the output terminal. To obtain an exact current mirror ratio which is larger than 1 between the input current path and the output current path, using a small number of components and low power supply voltages, the current mirror arrangement according to the invention is characterized in that: n is larger than 1; the current splitting circuit is adapted to split up the current from the first circuit point directly to the output terminal and a reference point in a ratio of m:1, in which the relation m = 1/(n-1) is at least substantially satisfied for m.
Abstract:
Operational amplifiers with a gain enhancement apparatus and method result in a substantial improvement in the gain of such amplifiers without change in the gain of the signal amplifying transistors. The gain enhancement is achieved by providing a circuit for having one transistor in the folded cascode stage of the amplifier substantially track the operating conditions of another transistor in the folded cascode stage, thereby substantially eliminating the unbalanced differential drive from the differential input stage that would have been required to accommodate the Early effect in the second stage. This is particularly advantageous when driving MOS output drivers wherein large voltage excursions in the second stage are required, particularly when sinking current from a load.
Abstract:
At the anode terminal of the photoreceptor element of an optical receiver, a large time constant occurs due to a parasitic capacitance. The optical receiver is constituted to compensate the fluctuation of the parasitic capacitance caused by the scatter in manufacturing, by constituting a variable negative-capacitance circuit composed mainly of an NPN type transistor which can operate at a high speed and equivalently reducing the parasitic capacitance which is generated in the photoreceptor element or when the element is mounted by connecting the output of the photoreceptor element to the input terminal of a preamplifier.
Abstract:
Operational amplifiers with a gain enhancement apparatus and method result in a substantial improvement in the gain of such amplifiers without change in the gain of the signal amplifying transistors. The gain enhancement is achieved by providing a circuit for having one transistor in the folded cascode stage of the amplifier substantially track the operating conditions of another transistor in the folded cascode stage, thereby substantially eliminating the unbalanced differential drive from the differential input stage that would have been required to accommodate the Early effect in the second stage. This is particularly advantageous when driving MOS output drivers wherein large voltage excursions in the second stage are required, particularly when sinking current from a load.
Abstract:
An electronic circuit comprises coupled transconductors. The transconductors comprise two complementary differential pairs (P1/P2; N1/N2) whose outputs are connected directly to two output terminals (OA, OB). Two diodes (P3, N3) are arranged in series between the common terminals (BA, BB) of the differential pairs. The common-mode voltage of the differential pairs is available on the node (CM) between the two diodes (P3, N3). The common-mode voltage of the one transconductor (TR2) is used to control one of the bias current sources (P4) of the other transconductor (TR1) and, if desired, also that of the one transconductor (TR2). In this way the common-mode voltage on the output terminals (OA, OB) of the other transconductor (TR1) is fixed.
Abstract:
Die Erfindung betrifft eine Fahrzeugschaltungsanordnung (1) zur überlastungsdetektierenden Versorgung einer elektrischen Last (2) mit einer Fahrzeugbordspannung (UFB), wobei die elektrische Last (2) eine vorgebbare Nennleistung aufweist, umfassend: - einen Fahrzeugbordspannungseingang (E1), - ein Steuergerät (3) zur Steuerung einer Fahrzeugfunktion, wobei das Steuergerät (3) einen integrierten Halbleiterbaustein (3a), z.B. einem System Basis Chip (SBC), aufweist, wobei der integrierte Halbleiterbaustein einen integrierten High-Side-Switch (S1) der mit dem Fahrzeugbordspannungseingang (E1) zur Durchschaltung einer an dem Fahrzeugbordspannungseingang (E1) anliegenden Fahrzeugbordspannung (UFB) auf einen High-Side-Switch Ausgang (A1) verbunden ist, wobei der High-Side-Switch Ausgang (A1) eine vorgegebene Stromtragfähigkeit aufweist und das Steuergerät (3) dazu eingerichtet ist, den Ausgangsstrom (IA1) des High-Side-Switch-Ausgangs (A1) zu erfassen, wobei eine Nennstromaufnahme der zu versorgenden Nennlast oberhalb der vorgegebenen Stromtragfähigkeit des High-Side-Switch-Ausgangs (A1) liegt.