Voltage Regulator Shield Wiring for PSRR
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Solution Overview
Problem
Existing voltage regulators face instability due to power supply noise, which affects the output voltage and is indicated by a low Power Supply Rejection Ratio (PSRR), but increasing PSRR values can lead to increased power consumption.
Innovation Solution
A voltage regulator design that includes a shield wiring conductor disposed above at least one of the NMOS transistors to reduce parasitic capacitance and mitigate power supply noise propagation, thereby enhancing the PSRR characteristics without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSRR value is raised to reduce power supply noise impact, then output voltage stability is improved, but power consumption increases
Solution Approach 1:
A shield wiring conductor is introduced as an intermediary element between the power supply noise source and the transistor gates. This conductor acts as a mediator that intercepts and redirects noise signals, preventing them from directly coupling into the sensitive gate terminals. The shield wiring serves as a protective barrier that improves PSRR without requiring additional power consumption from the regulator circuit itself.
Solution Approach 2:
The noise rejection function is extracted from the main voltage regulation circuit and implemented separately through the shield wiring structure. By isolating the noise mitigation mechanism from the power-consuming regulation elements, the patent achieves improved PSRR characteristics without increasing the power consumption of the core regulator operation.
2Device complexity
If conventional voltage regulator design is used, then device simplicity is maintained, but susceptibility to power supply noise increases
Solution Approach 1:
The shield wiring conductor serves as a protective intermediary that blocks noise propagation paths to the transistor gates. This addition introduces minimal structural complexity while effectively reducing noise susceptibility. The shield wiring integrates into the existing regulator layout without fundamentally redesigning the core regulation architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The implementation of shield wiring significantly reduces power supply noise impact on the output voltage, achieving improved PSRR characteristics with a 50% reduction in noise components and a 6 dB improvement in noise rejection, reaching up to 100 dB, while maintaining stable output voltage across varying load conditions.
Implementation Method 1
the amplifier has: a first transistor to feed a current in accordance with the feedback voltage; and a second transistor to feed a current in accordance with the reference voltage, wherein the first transistor has a first gate to be applied with the feedback voltage, and the second transistor has a second gate to be applied with the reference voltage, and the voltage regulator further has a conductor disposed to face at least either one of the first and second gates, the conductor being set at a predetermined electric potential
Data Source
AI summary
A voltage regulator has feedback circuitry to generate a feedback voltage relative to an output voltage, and an amplifier to amplify a differential voltage between the feedback voltage and a reference voltage to generate the output voltage. The amplifier has a first transistor to feed a current in accordance with the feedback voltage, and a second transistor to feed a current in accordance with the reference voltage. The first transistor has a first gate to be applied with the feedback voltage, and the second transistor has a second gate to be applied with the reference voltage, and the voltage regulator further comprising a conductor disposed to face at least either one of the first and second gates, the conductor being set at a predetermined electric potential.