On-Chip RF Source for Fast Accurate Receiver Self-Test
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Solution Overview
Problem
The high cost and inefficiency of external RF testers for RF chip testing, along with the need for precise impedance matching and slow power/frequency adjustments, hinder effective and economical testing of RF chips.
Innovation Solution
An on-chip RF source with a built-in self-test system, including a low-noise amplifier, RF calibration generator, and a controller, which allows for precise power level adjustment and frequency tuning within microseconds, eliminating the need for external testers and reducing test time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external RF testers are used for RF chip testing, then testing can be performed with dedicated signal sources, but the cost per second test time becomes prohibitively expensive
Solution Approach 1:
The RF chip includes an integrated RF calibration generator that generates test signals internally, allowing the device to test itself without requiring external RF testers. This self-service approach eliminates the need for expensive external testing equipment while maintaining measurement accuracy through on-chip signal generation and calibration capabilities
Solution Approach 2:
The RF receiver front-end is designed to perform both its primary reception function and self-testing functions using the same hardware components. The low-noise amplifier, RF calibration generator, and analog-to-digital converter work together to enable both normal operation and built-in self-test, reducing the need for separate testing equipment
2Measurement precision
If external RF testers with dedicated signal sources are used, then RF signals can be supplied to the device under test, but the impedance matching requirements become complex and costly
Solution Approach 1:
The RF calibration generator is integrated directly onto the RF integrated circuit chip, merging the signal generation function with the receiver front-end. This integration eliminates the need for external RF testers and complex impedance matching networks, as the test signal is generated at the same location where it is needed, simplifying the overall system architecture
Solution Approach 2:
The RF calibration generator acts as an intermediary that provides test signals directly to the receiver front-end through on-chip routing. This intermediary approach eliminates the need for external RF testers and complex impedance matching networks, as the calibration signals are generated and delivered within the same integrated circuit
3Adaptability or versatility
If power level of RF source in external tester is adjusted, then frequency and power can be changed, but the adjustment speed is slow in the order of milliseconds
Solution Approach 1:
The patent replaces the mechanical adjustment mechanisms of external RF testers with on-chip electronic control elements. digitally controllable switches and integrated circuit components enable rapid reconfiguration of the RF signal path and parameters, achieving microsecond-level adjustment speeds compared to the millisecond-level speeds of external testers
Data Source
AI summary
The present disclosure provides a radio frequency (RF) receiver front-end comprising an RF integrated circuit chip with an antenna port terminal for coupling to an external antenna. The chip includes a low-noise amplifier coupled between an RF input terminal and an RF output terminal; an integrated built-in self-test system featuring resistors, a test switch, an oscillator generating a square-wave signal for testing, a buffer sharpening edges of the square-wave signal, and a controller performing self-tests to determine one or more characteristics of the RF receiver front-end. Additionally, an analog-to-digital converter converts test signals into digital form for analysis by the controller. An electronically controllable antenna switch is included to facilitate selective coupling between the antenna port and the RF input terminal during reception of RF signals or built-in self-testing. The system enables efficient testing and characterization of the RF receiver front-end directly on-chip, enhancing reliability in wireless communications devices.