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对装有用数字锁相回路控制的声表面波(SAW)延迟线本机振荡器的422MHz汽车无线电接收机作了音频噪声信号畸变(SINAD)测试。详细介绍了天线射频输入为-109dBm、要求SINAD性能为12dB的内通道测试,以及频率间隔为25kHz、要求SINAD选择性达到70dBm的相邻通道选择性测试。也简要介绍了接收机电路的一些细节,包括以五次谐波模式工作的SAW阶梯指延迟线本机振荡器。用自动频率稳定性分析仪和哈达马德方差法作过稳定性测试,获得傅里叶频偏10kHz的相位噪声小于-115dBc/Hz,与期望的值一致。在测量程序内,稳定性分析仪中频级的典型频漂约为0.15Hz。
An audio noise signal distortion (SINAD) test was performed on a 422 MHz car radio receiver equipped with a digital phase-locked loop (SAW) delay line local oscillator. Details are given for the antenna's RF input of -109dBm, an internal channel test that requires 12dB SINAD performance, and adjacent channel selectivity tests that require an SINAD selectivity of 70dBm at 25kHz intervals. The receiver circuit is also briefly described in some detail, including SAW ladder-based delay line local oscillator operating in the 5th harmonic mode. Stability tests were performed using an automatic frequency stability analyzer and Hadamard's variance method to obtain a phase offset of less than -115 dBc / Hz for the Fourier frequency offset of 10 kHz, consistent with the expected value. Within the measurement program, the typical frequency drift of the mid-level of the stability analyzer is about 0.15 Hz.