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US 6,784,650 B2Granted
Circuit configuration for generating a controllable output voltage
AssigneeInfienon Technologies AG
InventorsThomas Hein, Patrick Heyne, Thilo Marx, Torsten Partsch
Life of this patent
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Abstract
A switching network with trimmable resistors lies in a control loop of a voltage generator that can be switched off from the supply voltage by a logic device. The logic device and also the switching network are driven by the same signals. The circuit configuration can be used for trimming or switching off the output voltage generated by the voltage generator during the functional test. As many settings as possible for the output voltage can be tested by a small number of control signals.
Claims10
A circuit configuration for generating a controllable output voltage, comprising:
- a voltage generator having input terminals receiving a supply voltage, an output terminal providing the controllable output voltage and, a control terminal controlling the controllable output voltage;
- a comparator having inputs receiving a reference signal and a comparator control signal derived from the controllable output voltage and an output connected to said control terminal of said voltage generator;
- supply terminals for receiving the supply voltage to be forwarded to said voltage generator;
- transistors having control terminals and controlled paths receiving the supply voltage to be forwarded to said voltage generator, a first of said transistors connected between a first of said supply terminals and one of said input terminals of said voltage generator, a second of said transistors connected between a second of said supply terminals and another of said input terminals of said voltage generator;
- a logic device connected to said control terminals of said transistors and outputting a transistor control signal for driving said transistors;
- and
- a signal path connected between said output terminal of said voltage generator and said input of said comparator receiving the comparator control signal, said signal path having a switching network connected to said comparator and receiving at least a first control signal and a second control signal, a level of the comparator control signal derived from the controllable output voltage being dependent on the first and second control signals.
4 more elements
Dependencies are inferred from the claim text.