Voltage regulator
AssigneeDeutsche ITT Industries GmbH
InventorsUlrich Theus, . Mario Motz
Life of this patent
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Abstract
A voltage regulator contains a reference which provides a value for comparison by an error amplifier which generates a control signal in response to the deviation of the output to the reference. As many stages of the circuit as possible are connected to fixed potential points. The fixed potential points are fixed with respect to the regulated output voltage. This provides a voltage regulator which is insensitive to interference signals from the unregulated supply voltage. The interference signals from the supply voltage are further buffered by using relatively small capacitors within the circuit, rather than a large external filter means.
Claims21
A voltage regulator comprising:
- a first transistor of a first conductivity type, having a first electrode, a second electrode and a control electrode, said second electrode coupled to a first supply potential;
- a second transistor of a second conductivity type, having a first electrode, a second electrode and a control electrode, said first electrode coupled to a fixed potential;
- an output line coupled to said first electrode of said first transistor;
- an amplifying means for providing a control output signal in response to a potential of said output line and a voltage reference, said control electrode of said first transistor and said control electrode of said second transistor adapted to receive said control output signal;
- a current difference means for obtaining a difference of current through said first transistor and current through said second transistor, said means coupled to said second electrode of said second transistor and to said first electrode of said first transistor.
A voltage regulator comprising:
- a first p-channel transistor having a gate, source and drain electrode and a first n-channel transistor having a gate, source and drain electrode connected in parallel, an error amplifier means having an output, the output commonly coupled to the gate electrode of the first p-channel transistor, and the gate electrode of the first n-channel transistor, the source electrode of the first p-channel transistor coupled to a first fixed potential point, and the source electrode of the first n-channel transistor connected to a second fixed potential point, and a switching device which couples current of the first p-channel transistor and current of the first n-channel transistor into a node, for obtaining a difference of the currents, the node coupled to an output line, wherein the node is the first fixed potential point.
Dependencies are inferred from the claim text.