Voltage Regulator AC Feedback Loop Stability
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Solution Overview
Problem
Modern electronic devices require improved voltage regulators to efficiently manage low regulated voltages and maintain power consumption, but existing solutions lack effective frequency range power signal rejection and stability under varying loads.
Innovation Solution
A voltage regulator circuit utilizing a p-channel transistor, operational amplifier, and AC feedback loop with p-channel source-follower transistors and current sources to generate and regulate voltages, ensuring stability and improved power signal rejection across a frequency range by adjusting phase and gain bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voltage regulator circuits are used, then basic voltage regulation is achieved, but power signal rejection over frequency range is insufficient and stability under varying loads deteriorates
Solution Approach 1:
The patent implements an AC feedback loop that samples the output voltage and feeds it back to the error amplifier. This feedback mechanism enables the circuit to dynamically adjust and maintain stability under varying load conditions by continuously monitoring output variations and correcting them through the control loop.
Solution Approach 2:
The circuit employs dynamic compensation techniques with frequency-dependent impedance networks that adapt the loop gain and phase characteristics across different operating conditions. This dynamic behavior allows the regulator to maintain stability margins across varying loads while rejecting power signal variations.
2Object-affected harmful factors
If conventional voltage regulator circuits are used, then basic voltage regulation is achieved, but power signal rejection over frequency range is insufficient
Solution Approach 1:
The AC feedback loop specifically targets power signal rejection by sampling output voltage variations and injecting corrective signals through the error amplifier. This feedback path is designed to reject periodic power signal variations across a broad frequency range by maintaining adequate loop gain at these frequencies.
Solution Approach 2:
The circuit utilizes frequency-dependent compensation networks that modify the loop transfer function characteristics across different frequency ranges. By changing the effective impedance and gain parameters dynamically with frequency, the circuit achieves broad bandwidth power signal rejection without requiring excessively complex filtering stages.
3Use of energy by moving object
If low regulated voltages are used, then power consumption is reduced, but voltage regulation stability and performance deteriorate
Solution Approach 1:
The error amplifier continuously monitors the difference between reference and output voltages, enabling precise control of the pass transistor even at low output voltage levels. This feedback mechanism ensures that regulation stability is maintained despite the reduced voltage headroom, allowing low power consumption without sacrificing reliability.
Solution Approach 2:
The compensation network is designed with parameters optimized for low-voltage operation, ensuring adequate phase margin and loop stability when the regulated voltage is low. By adjusting the compensation pole-zero locations and impedance values, the circuit maintains stable regulation across the low voltage range while minimizing power consumption.
Data Source
AI summary
A regulated voltage is generated at an output terminal of a voltage regulator circuit having at least one input terminal. A feedback signal is coupled from a first transistor coupled in parallel with a first resistor between the output terminal and the input terminal. The feedback signal is coupled to the input terminal to regulate the stability of the voltage regulator circuit. In a method of operation, the stability of a circuit is regulated by generating a feedback signal in the circuit to add a zero to a transfer function and raise an open loop phase curve of the circuit to result in a better power signal rejection ratio over a frequency range for the circuit.