基于最大等增益圆的矢量调制器增益控制方法

A Practical Approach Based on Max Gain Circle for Gain Control of a Vector Modulator

矢量调制器因其自身结构小、功耗低等特点已广泛应用于雷达、导航、仪器仪表及卫星通信等领域;基于矢量调制器的最大等增益圆理论,深入分析了增益圆点、半径与调制器增益输出的关系,设计出一种可全频段扫描、一键自动测试的通用矢量调制器增益控制方案,实现了对矢量调制器增益输出以及其平坦度的精确控制,并可灵活设置矢量调制器的精度和平坦度指标,提高了矢量调制器的性能以及校准效率;验证对象为Hittite Microwave公司的HMC1097LP4E矢量调制芯片,单点验证时间不超过1min,增益控制精度可达0.1dB,平坦度可达0.5dB。

Vector modulators are widely used in radar, navigation, instrument and satellite communication because of their small struc- ture and low power consumption. Based on Max Gain Circle （MGC）, analyzed the relationship between radius of the MGC and gain output of the vector modulator deeply, presents a general practical approach for gain control of a vector modulator, which can scan at full frequency in an automatic measurement system. This system implements the accurate controlling of the vector modulator gain output and its flatness, the precision and flatness of the vector modulator can be set up flexibly, and improves the efficiency of the performance and calibration of the vec- tor modulator. The applied object is a chip named HMC1097LP4E of the Hittite Microwave, it takes about 1 minutes to get all required data, the precision of the MGC is 0. 1 dB and the gain flatness is less than 0. 5 dB in the test frequency.