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实现了一种基于CMOS工艺的用于DRM与DAB数字广播射频调谐器的具有低相位噪声与低功耗的工作在37.5MHz的差分结构晶体振荡器.在晶体振荡器的核心部分采用了PMOS晶体管来代替传统的NMOS晶体管以降低相位噪声.采用了对称结构的电流镜以提高直流稳定度.采用了由一阶CMOS运算跨导放大器和简单的幅度探测器构成的幅度探测电路以提高输出信号的电流精确度.芯片采用0.18-μmCMOS工艺实现,芯片面积为0.35mm×0.3mm.芯片包含用于驱动50Ω测试的负载接口电路,在1.8V供电电压下,所测得的芯片功耗仅为3.6mW.晶体振荡器的工作输出信号在距离其中心频率37.5MHz频偏1kHz处的相位噪声为-134.7dBc/Hz.
A 37.5MHz differential structure crystal oscillator with low phase noise and low power consumption for DRM and DAB digital broadcasting RF tuner is implemented based on CMOS technology.The core of the crystal oscillator is PMOS transistor Instead of the traditional NMOS transistor to reduce the phase noise.The use of a symmetrical structure of the current mirror to improve DC stability.Adopted by the first-order CMOS transconductance amplifier and a simple amplitude detector amplitude detection circuit to increase the output signal Current Accuracy The chip is implemented in a 0.18-μm CMOS process with a chip area of 0.35mm × 0.3mm. The chip contains a load interface circuit for driving a 50Ω test. The measured chip power consumption is only 3.6 at a supply voltage of 1.8V mW. The output signal of the crystal oscillator is -134.7dBc / Hz at a frequency offset of 1kHz from its center frequency of 37.5MHz.