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US 8,265,574 B2Granted
Voltage regulator with control loop for avoiding hard saturation
AssigneeTriQuint Semiconductor, Inc.
InventorsKiran Karnik, Andrew Labaziewicz
Life of this patent
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Abstract
Embodiments of circuits, apparatuses, and systems for a voltage regulator with a control loop for avoiding hard saturation are disclosed. Other embodiments may be described and claimed.
Claims20
A voltage regulator comprising:
- an operational amplifier having an output;
- a pass transistor having a first gate coupled with the output of the operational amplifier, a first source coupled with a supply rail, and a drain coupled with an output terminal;
- and
- a control loop having a sense transistor with a second gate coupled with the output of the operational amplifier and a second source coupled with the drain of the pass transistor, the control loop configured to sense a condition and to maintain a desired gate voltage at the pass transistor based on the sensed condition.
1 more element
A method of providing a regulated output voltage comprising:
- driving a pass transistor with an amplified differential input voltage, generated by an operational amplifier, to provide the regulated output voltage;
- sensing, with a sense transistor of a control loop, a hard saturation condition, wherein the sense transistor has a source coupled with a drain of the pass transistor;
- and
- operating the control loop to maintain a desired gate voltage at the pass transistor based on said sensing of the condition.
1 more element
A system comprising:
- a voltage regulator having
- an operational amplifier to provide an amplified differential input voltage;
- a pass transistor coupled with the operational amplifier and configured to provide a regulated output voltage based on the amplified differential input voltage;
- and
- a control loop including a sense transistor with a source coupled with a drain of the pass transistor, the control loop configured to sense a condition and to maintain a desired gate voltage at the pass transistor based on the sensed condition;
- and
- a power amplifier including a power input supply terminal coupled with the voltage regulator to receive the regulated output voltage, the power amplifier configured to amplify a radio frequency (RF) signal to be transmitted over the air.
4 more elements
Dependencies are inferred from the claim text.