关键词: 相位噪声, 间接测试, 本振, 小型化模块

Abstract: The quality of the signal from the local oscillator of the transceiver circuit module plays an important role in the overall performance of the system. Due to the size limitation of miniaturized modules, it is not possible to set up a test port at the output end of the local oscillator, and therefore it is not possible to accurately test the phase noise directly at the output end of the local oscillator. An indirect test method for the phase noise of the local oscillator signal of a miniaturized transceiver circuit module is proposed, which requires testing the power and the phase noise of the input/output signals of the module, and the gain and noise figure of the entire transceiver pathway, and obtaining the phase noise of the local oscillator signal by means of a formula. The miniaturized transceiver circuit module is tested using this method, and the phase noise results obtained are compared with the device specifications, which are highly consistent, thus verifying the correctness and validity of the indirect test method.

Key words: phase noise, indirect test, local oscillator, miniaturized module