Semiconductor Integrated Circuit Single Antenna Design
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Solution Overview
Problem
The existing semiconductor integrated circuits with both non-contact IC card and reader/writer functions face challenges in reducing size without compromising receiving sensitivity and signal transmission efficiency, as they require separate circuits for IC card and reader/writer functions, leading to increased chip size and compatibility issues with a single antenna.
Innovation Solution
The semiconductor integrated circuit employs a demodulation means for both received signals, full-wave rectification and smoothing for power stabilization, and transmission mechanisms using a single antenna, allowing for differential signal transmission and reception, which improves compatibility and reduces chip size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate circuits are provided for IC card and reader/writer functions, then functional compatibility is achieved, but chip size increases
Solution Approach 1:
The patent combines the IC card circuit and reader/writer circuit into a single integrated chip, merging previously separate circuits to reduce overall chip size while maintaining both functional capabilities through shared antenna and circuit resources
Solution Approach 2:
The semiconductor integrated circuit is designed to perform multiple functions - both IC card operations and reader/writer operations - within a single chip structure, allowing the same hardware to serve dual purposes and eliminating the need for separate dedicated circuits
2Area of stationary object
If a single antenna is used for both functions, then chip size is reduced, but receiving sensitivity and transmission efficiency deteriorate
Solution Approach 1:
The patent implements dynamic switching mechanisms that allow the single antenna to be selectively connected to different circuit paths depending on operational mode, optimizing signal characteristics for either IC card or reader/writer function as needed while maintaining good receiving sensitivity and transmission efficiency
3Area of stationary object
If a single antenna is used for both functions, then chip size is reduced, but signal transmission efficiency deteriorates
Solution Approach 1:
The patent employs dynamic connection switching that optimizes the antenna's signal transmission characteristics based on the active function, ensuring efficient signal transmission for both IC card and reader/writer operations despite using a single antenna
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
This solution enables efficient communication with both non-contact IC cards and wireless readers/writers while reducing the size of the semiconductor integrated circuit without deteriorating receiving sensitivity or transmission efficiency.
Implementation Method 1
An electromagnetic wave transmitted from a not shown external wireless reader/writer (hereinafter, referred to as external reader/writer) is received by the antenna 12 and converted into an electric signal
Implementation Method 2
The external reader/writer transmission signal is half-wave rectified and smoothed by a half-wave rectification and smoothing circuit composed of a diode 41 and a capacitor 42
Data Source
AI summary
The present invention relates to a semiconductor integrated circuit and a wireless communication apparatus that can be reduced in size without deteriorating a receiving sensitivity and a transmission efficiency. Communication with an external reader/writer and an external non-contact IC card is carried out through a common antenna 211. The signal received from the external reader/writer or the external non-contact IC card through the antenna is supplied to an ASK demodulation circuit 149 and demodulated. The signal received from the external reader/writer is full-wave rectified and smoothed by an full-wave rectification and smoothing circuit composed of diodes 231, 232 and a capacitor 233, and the power obtained from the full-wave rectified and smoothed signal is supplied to respective units of a semiconductor integrated circuit 101. The present invention can be applied to a mobile phone.