Transceiver Loopback Cross-Over for PA Self-Testing and Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of maintaining or improving antenna performance in wireless communication devices with limited space and complex functionality, particularly in mmW phased-array antennas, is compounded by costly and impractical post-manufacture testing, and mutual coupling calibration increases factory calibration time and cost.
Innovation Solution
Implementing a transceiver integrated circuit with cross-over circuitry that allows for internal loopback testing, enabling self-testing and calibration of power amplifiers without external equipment, and facilitating real-time feedback for digital pre-distortion calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If post-manufacture testing is performed with external equipment, then testing accuracy is improved, but production cost and testing time increase
Solution Approach 1:
The transceiver IC performs self-testing by using its own internal resources (power amplifiers, routing circuitry, input/output ports) to generate test signals and measure performance without requiring external testing equipment. The device tests itself during normal operation or in dedicated test modes, eliminating the need for separate production testing infrastructure.
Solution Approach 2:
The input/output ports and routing circuitry serve dual purposes: they function as normal operational interfaces during mission mode and as test signal pathways during self-testing mode. The same hardware components are reused for both communication functions and diagnostic functions, eliminating the need for dedicated test equipment.
2Reliability
If mutual coupling calibration is performed, then antenna performance is improved, but factory calibration time and cost increase
Solution Approach 1:
The system performs preliminary self-calibration of power amplifier mutual coupling effects using the loopback testing capability before actual operation. By characterizing and compensating for coupling effects internally during manufacturing or initial setup, the need for time-consuming external mutual coupling calibration is eliminated.
Solution Approach 2:
The loopback testing mechanism provides feedback signals that allow the system to measure and characterize mutual coupling effects between power amplifiers. This feedback is used to generate correction factors or calibration data that compensate for coupling effects, improving antenna performance without external calibration equipment.
3Manufacturing precision
If complex test procedures are implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The testing function is extracted from the external manufacturing environment and embedded within the transceiver IC itself. By integrating self-testing capability directly into the device, the complex external test procedures are replaced with simpler internal operations that use the device's own resources.
Data Source
AI summary
A method for use in self-testing a transceiver integrated circuit includes: receiving a test signal, having a first intermediate frequency, at a first intermediate frequency input/output port associated with a first transceiver subcircuit of the transceiver integrated circuit; directing the test signal to a second transceiver subcircuit of the transceiver integrated circuit; upconverting the test signal to have a radio frequency; amplifying the test signal by a power amplifier, of the second transceiver subcircuit, to provide an amplified test signal; coupling at least a portion of the amplified test signal as a feedback signal; downconverting the feedback signal to a second intermediate frequency; and directing the feedback signal to a second intermediate frequency input/output port associated with the second transceiver subcircuit.