On-Chip Test Circuit for RFIC Millimeter-Wave Testing
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Solution Overview
Problem
Testing millimeter-wave RF systems is difficult and expensive due to the need for precise, high-frequency test fixtures and equipment that are time-consuming to operate and maintain, and require specialized expertise, which can be a bottleneck in high-volume semiconductor production.
Innovation Solution
Incorporating an on-chip test circuit that generates high-frequency test signals using low-frequency signals, allowing for the measurement of signal levels and control of the test circuit, thereby eliminating the need for external high-frequency test equipment and expertise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional high-frequency test fixtures and equipment are used to test millimeter-wave RF systems, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the high-frequency signal generation and measurement functions from external test equipment and relocates them onto the RFIC chip itself through integrated VCOs, mixers, and power detectors. This eliminates the need for complex external high-frequency test fixtures while maintaining measurement capability through on-chip self-testing mechanisms.
Solution Approach 2:
The patent introduces an intermediate frequency (IF) conversion stage as a mediator. High-frequency RF signals are converted to lower IF frequencies through mixing operations, enabling measurement using simpler, lower-frequency test equipment while preserving the ability to characterize high-frequency RF circuit performance.
2Measurement precision
If conventional high-frequency test equipment is used, then measurement precision is improved, but ease of operation deteriorates due to specialized expertise requirements
Solution Approach 1:
The RFIC performs self-testing through integrated on-chip test circuits that generate test signals and measure their own performance characteristics. The VCO, mixers, and power detectors work together to enable the circuit to characterize its own RF performance without requiring external test equipment or specialized operator expertise.
Solution Approach 2:
The patent transforms the measurement domain by converting high-frequency RF parameters into lower-frequency IF parameters through mixing. This parameter transformation allows standard, easier-to-operate test equipment to measure high-frequency performance by observing the converted lower-frequency signals.
3Reliability
If full functional testing of RF signal path is performed, then reliability is improved, but productivity decreases due to time-consuming tests
Solution Approach 1:
The test circuits are pre-integrated into the RFIC during manufacturing, with VCOs, mixers, and power detectors permanently configured on-chip. This preliminary integration eliminates the need for time-consuming external test setup and calibration, enabling rapid full-functional testing to be performed directly on the packaged device without sacrificing measurement comprehensiveness.
Data Source
AI summary
In an embodiment, a method of testing a radio frequency integrated circuit (RFIC) includes generating high-frequency test signals using the on-chip test circuit, measuring signal levels using on-chip power detectors, and controlling and monitoring the on-chip test circuit using low-frequency signals. The RFIC circuit is configured to operate at high frequencies, and an on-chip test circuit that includes frequency generation circuitry configured to operate during test modes.