Transceiver Path Switching for FDD IIP2 Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for calibrating second-order intermodulation product (IIP2) in transceivers are challenging, especially for frequency division duplex (FDD) bands, due to integration issues and internal interference, making it difficult to universally apply and maintain sensitivity performance.
Innovation Solution
A transceiver device with a switching unit that switches between coupler and receive paths, allowing for IIP2 calibration without affecting conventional transmission and reception performance, and includes a SAWless structure to reduce intermodulation influence from transmit leakage signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional IIP2 calibration method is applied to FDD band, then integration and internal interference problems occur, but IIP2 calibration capability is needed
Solution Approach 1:
The patent segments the signal path by introducing a switching unit that separates the calibration path from the normal receive path. This allows IIP2 calibration to be performed independently without interfering with conventional reception operations, thus resolving the integration and internal interference problems while maintaining calibration capability.
Solution Approach 2:
The switching unit acts as an intermediary component that enables selective connection between the coupler path and receive path. During calibration, it routes calibration signals through the coupler; during normal operation, it routes received signals through the receive path, thereby preventing internal interference while maintaining both functions.
2Object-affected harmful factors
If a receive SAW filter is used to remove leakage signal, then leakage signal removal is achieved, but signal removal varies with frequency and IIP2 calibration becomes difficult
Solution Approach 1:
The patent introduces dynamic switching capability that allows the system to change its configuration based on operational mode. The switching unit dynamically connects or disconnects the coupler path during calibration, enabling precise IIP2 measurement without the frequency-dependent signal removal issues of static SAW filters.
Solution Approach 2:
The patent extracts the calibration function from the normal receive path by using the switching unit to isolate the coupler path during calibration. This separation allows IIP2 calibration to be performed independently without the interference of frequency-varying signal removal characteristics of SAW filters.
3Reliability
If IIP2 calibration is performed in board level, then IIP2 performance can be ensured, but it is difficult to be universally applied across different mixer designs
Solution Approach 1:
The patent creates a universal calibration architecture that can be applied across different mixer designs and frequency bands. The switching unit and coupler path configuration provide a standardized approach to IIP2 calibration that works independently of specific mixer implementation details, enabling universal applicability while ensuring reliable IIP2 performance.
Data Source
AI summary
An electronic device is provided that includes an antenna configured to receive a first signal and transmit a second signal. The electronic device also includes a transceiver configured to perform frequency conversion of the first signal and the second signal. The electronic device further includes a coupler path configured to transmit the second signal to the transceiver via a coupler, and a receive path configured to transmit the first signal, obtained from the antenna, to the transceiver. The electronic device also includes a switching unit configured to be connected with the transceiver and switch between the coupler path and the receive path.