IC Layout with Regulator Isolation for Stable Bandgap Reference
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Solution Overview
Problem
Noise generated by the rectification operation of the rectifier circuit in integrated circuit devices adversely affects the generation of a stable reference voltage, which is not adequately addressed by existing layouts.
Innovation Solution
The integrated circuit device includes a regulator disposed between the rectifier circuit and the bandgap reference circuit to mitigate noise interference, thereby stabilizing the reference voltage generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rectifier circuit is integrated on the semiconductor substrate, then the device functionality is improved, but noise is generated that adversely affects reference voltage generation
Solution Approach 1:
The regulator circuit is positioned between the rectifier circuit and the bandgap reference circuit to act as an intermediary. It regulates the rectified voltage and filters noise before the voltage is used by the reference circuit, thereby preventing noise from adversely affecting reference voltage generation while maintaining full device functionality.
Solution Approach 2:
The patent applies different functional qualities to different regions of the circuit. The regulator circuit provides noise filtering and voltage regulation specifically to the bandgap reference circuit region, while the rectifier circuit operates independently in its own region. This local differentiation allows each circuit to operate optimally without interfering with others.
2Object-affected harmful factors
If the regulator is disposed between the rectifier circuit and the bandgap reference circuit, then noise interference is reduced, but the device layout complexity increases
Solution Approach 1:
The patent segments the circuit into distinct functional blocks with clear spatial separation: the rectifier circuit in a first region, the regulator circuit in a second region between the rectifier and reference circuit, and the bandgap reference circuit in a third region. This segmentation reduces noise interference through physical distancing while maintaining manageable layout complexity through systematic organization.
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; a BGR circuit which is provided at the semiconductor substrate and generates a reference voltage based on the rectified voltage, and a regulator that regulates the rectified voltage based on the reference voltage output by the BGR circuit and outputs a regulated voltage. In a plan view of the semiconductor substrate, the regulator is disposed between the rectifier circuit and the BGR circuit.