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首页> 外文期刊>Microwaves, Antennas & Propagation, IET >Integrated wideband and low phase-noise signal source using two voltage-controlled oscillators and a mixer
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Integrated wideband and low phase-noise signal source using two voltage-controlled oscillators and a mixer

机译：使用两个压控振荡器和混频器的集成宽带和低相位噪声信号源

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摘要

This study presents a method to design a wideband signal source based on two voltage-controlled oscillators (VCOs) with different centre frequencies and a mixer. The principle is to combine three frequency bands to form one wide frequency range. The three bands consist of second harmonic bands from two VCOs and a mixer band that is generated by mixing the two fundamental signals of VCOs to bridge the frequency gap. Apart from the wide tuning range, an additional benefit of a mixer-based signal source is that the phase-noise increases ~3 dB/octave, which is less than the theoretical limit (6 dB/octave) for a fundamental frequency VCO followed by a frequency multiplier or extraction of second harmonic signal from a VCO. A prototype of the proposed signal source implemented in indium gallium phosphide hetero junction bipolar transistor monolithic microwave integrated circuit technology demonstrates both wide frequency tuning range and a very low phase noise. It exhibits a tuning bandwidth extending from 11.8 to 16.7 GHz and the signal??s phase noise varies between ??91 and ??103 dBc/Hz at 100 kHz offset frequency.
机译：这项研究提出了一种基于两个具有不同中心频率的压控振荡器（VCO）和混频器设计宽带信号源的方法。原理是将三个频带组合在一起以形成一个较宽的频率范围。这三个频段由来自两个VCO的二次谐波频段和一个混频器频段组成，混频器频段是通过混合VCO的两个基本信号以弥合频率间隙而产​​生的。除了较宽的调谐范围外，基于混频器的信号源的另一个好处是，相位噪声增加了〜3 dB /倍频程，小于基本频率VCO的理论极限值（6 dB /倍频程），随后是倍频器或从VCO提取二次谐波信号。磷化铟镓异质结双极晶体管单片微波集成电路技术中实现的拟议信号源的原型展示了宽的频率调谐范围和非常低的相位噪声。它具有从11.8 GHz扩展到16.7 GHz的调谐带宽，并且在100 kHz偏移频率下，信号的相位噪声在Δ91和Δ103dBc / Hz之间变化。

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