Bandgap Reference Circuit Noise Filtering in Rectifier ICs
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Solution Overview
Problem
Existing rectifier circuits that limit AC voltage amplitude to prevent adverse effects on reference voltages suffer from decreased power receiving efficiency.
Innovation Solution
An integrated circuit device incorporating a rectifier circuit and a bandgap reference circuit with capacitors to stabilize the reference voltage by reducing noise interference, using Schottky-type diodes for high-frequency rectification and a bandgap reference circuit to generate a stable reference voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clamp circuit is provided to limit the amplitude of the AC voltage, then the reference voltage is protected from adverse effects, but power receiving efficiency deteriorates
Solution Approach 1:
The harmful rectification operation is extracted and isolated from the reference voltage generation path. The rectifier circuit processes the AC voltage to generate a rectified voltage, which then serves as the power source for the bandgap reference circuit. This separation allows the reference voltage to be generated from the rectified voltage without being adversely affected by the rectification process, thereby protecting reference voltage stability while avoiding the need for a clamp circuit that would reduce power receiving efficiency
Solution Approach 2:
The AC voltage is rectified in advance to generate a rectified voltage before being used to power the bandgap reference circuit. By performing the rectification operation beforehand and using the resulting rectified voltage as the power source, the reference voltage generation process is decoupled from the rectification process, eliminating the adverse effects while maintaining power receiving efficiency
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 solution maintains a stable reference voltage and prevents decreases in regulated voltage due to noise interference, enhancing power receiving efficiency.
Implementation Method 1
a rectifier circuit configured to rectify an AC voltage by a rectifier element provided at the semiconductor substrate and output a rectified voltage
Implementation Method 2
a bandgap reference circuit provided at the semiconductor substrate and configured to generate a reference voltage based on the rectified voltage
Implementation Method 3
The bandgap reference circuit includes an operational amplifier having a first input terminal and a second input terminal, a first diode element provided between the first input terminal and a substrate potential node, a resistor and a second diode element provided in series between the second input terminal and the substrate potential node, a first capacitor provided between the first input terminal and the substrate potential node, and a second capacitor provided between the second input terminal and the substrate potential node
Data Source
AI summary
An integrated circuit device includes: a semiconductor substrate set at a substrate potential; a rectifier circuit that rectifies an AC voltage by a rectifier element provided at the semiconductor substrate and outputs a rectified voltage; and a BGR circuit provided at the semiconductor substrate and generates a reference voltage based on the rectified voltage. The BGR circuit includes an operational amplifier having a first input terminal and a second input terminal, a diode element provided between the first input terminal and a substrate potential node, a resistor and a diode element provided in series between the second input terminal and the substrate potential node, a capacitor provided between the first input terminal and the substrate potential node, and a capacitor provided between the second input terminal and the substrate potential node.