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US 2013/0154593 A1Published application
Adaptive phase-lead compensation with miller effect
AssigneeAtmel Corporation
InventorsSean S. Chen, Liwei Liu, Yongliang Wang
Life of this patent
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Abstract
An adaptive phase-lead compensation (zero) circuit is disclosed that can be added to a circuit (e.g., a CMOS-based LDO) to ease the compensation and increase the phase margin of the circuit. By using the disclosed adaptive phase-lead compensation circuit, an adjustable resistance can be connected to any nodes in the compensated circuit rather than just to the voltage source (VDD) or ground (GND), allowing the Miller Effect to be used via a Miller capacitor.
Claims14
A circuit comprising:
- a current sensor configured for sensing load current of a circuit;
- and
- a compensation circuit coupled to the current sensor and configured for providing an adaptive compensating zero for the circuit in response to a bias voltage generated by the current sensor in response to changes in load current.
A system comprising:
- a low dropout linear regulator;
- a current sensor configured for sensing load current of a circuit;
- and
- a compensation circuit coupled to the current sensor and the low dropout linear regulator, the compensation circuit configured for providing an adaptive compensating zero for the low dropout linear regulator in response to a bias voltage generated by the current sensor in response to changes in load current.
1 more element
A method of providing adaptive lead compensation with Miller Effect to a circuit, the method comprising:
- sensing current proportional to load current;
- generating a bias voltage in response to the sensed current;
- and
- adjusting resistance in an adaptive lead compensation circuit coupled to the circuit based on the bias voltage.
1 more element
Dependencies are inferred from the claim text.