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US 8,026,702 B2Granted
Voltage regulator system
AssigneeMicron Technology, Inc.
InventorToru Tanzawa
Life of this patent
Estimating the term…
Abstract
The present disclosure includes circuits, systems and methods for regulating voltage. One voltage regulator system embodiment includes a voltage regulator having an output and a number of stages coupled in parallel to the output of the voltage regulator. Each stage includes a source follower circuit, and a sample and hold circuit coupled in series between the output of the voltage regulator and an input of the source follower circuit.
Claims22
A voltage regulator system, comprising:
- a voltage regulator configured to monitor a difference of signal proportional to a voltage source with respect to a reference voltage signal, and having an output;
- and
- a plurality of stages coupled in parallel to the output of the voltage regulator, each stage including:
- a source follower circuit including a MOS transistor directly coupled in series between the voltage source and a regulated voltage output;
- and
- a sample and hold circuit directly coupled in series between the output of the voltage regulator and an input of the source follower circuit,
- wherein the voltage source is a pumped programming voltage provided by a charge pump from a supply voltage.
4 more elements
A voltage regulator system, comprising:
- a voltage regulator, the voltage regulator including:
- a comparator,
- a MOS transistor having a drain coupled to a voltage source;
- a first resistive element having a first terminal coupled to a source of the MOS transistor;
- a second resistive element having a first terminal coupled to a second terminal of the first resistive element, and a second terminal coupled to a common potential plane;
- and where a first input terminal of the comparator is coupled to a reference voltage signal line, and a second input terminal of the comparator is coupled to a node between the first and second resistive elements, and where the output of the comparator is coupled to the gate of the MOS transistor;
- a first sample and hold circuit having an input coupled to the output of the comparator;
- a first source follower circuit having an input coupled to the output of the first sample and hold circuit;
- a plurality of sample and hold circuits, each having an input coupled to the output of the comparator;
- and
- a source follower circuit corresponding to each of the plurality of sample and hold circuits, the source follower circuit having an input coupled to the output of the corresponding sample and hold circuit.
8 more elements
A method of voltage regulation, comprising:
- generating a gate voltage signal based on a difference between a reference voltage signal and a signal proportional to a voltage source;
- changing the reference voltage signal;
- storing a first gate voltage signal magnitude;
- storing a second gate voltage signal magnitude after changing the reference voltage signal;
- biasing a first source follower input with the stored first gate voltage magnitude, and a second source follower input with the stored second gate voltage magnitude;
- and
- providing simultaneously a first voltage regulator output from the first source follower and a second voltage regulator output from the second source follower,
- wherein the first voltage regulator output has a different magnitude than the second voltage regulator output.
5 more elements
Dependencies are inferred from the claim text.