Circuit for Generating a Control Current
AssigneeEpcos AG
InventorErwin Spits
Life of this patent
Estimating the term…
Abstract
A circuit includes a supply voltage and a control current line including two resistors. A sink current line branches off from the control current line between the resistors. A current sink transistor has an emitter that is connected to the sink current line and a collector that is connected to ground via a first further resistor. At least one reference transistor has an emitter that is connected to its base, to the supply voltage via a second further resistor and to the base of the current sink transistor. The collector of the reference transistor is connected to ground or to an emitter of a further reference transistor, which is switched in a manner similar to the first reference transistor.
Claims12
A circuit comprising:
- a supply voltage;
- a control current line comprising two resistors;
- a sink current line branching off from the control current line between the resistors;
- a current sink transistor having a base, an emitter and a collector, the emitter being connected to the sink current line and the collector being connected to ground via a first further resistor, and
- at least one reference transistor having a base, an emitter and a collector, the emitter of the reference transistor being connected to the base, to the supply voltage via a second further resistor and to the base of the current sink transistor, the collector of the reference transistor being connected to ground.
A circuit comprising:
- a supply voltage;
- a control current line comprising two resistors;
- a sink current line branching off from the control current line between the resistors;
- a current sink transistor having a base, an emitter and a collector, the emitter being connected to the sink current line and the collector being connected to ground via a first further resistor, and
- at least one reference transistor having a base, an emitter and a collector, the emitter of the reference transistor being connected to the base, to the supply voltage via a second further resistor and to the base of the current sink transistor, the collector of the reference transistor being connected to an emitter of a further reference transistor, which is switched in a manner similar to the first reference transistor.
Dependencies are inferred from the claim text.