论文标题
开发数字边带，分开元tseh lee Array的下转换
Development of digital sideband separating down-conversion for Yuan-Tseh Lee Array
论文作者
论文摘要
该报告提出了一种下调方法，涉及元tseh lee阵列的数字侧带分离，以使处理带宽加倍。接收器由MMIC HEMT LNA前端以3毫米的波长工作，以及在2-18 GHz的中间频率下输出信号的亚谐波混合器。侧带分离方案涉及一个模拟90度杂种，然后是两个混合器，这些混合器可将IF信号向下转换为基带中的一对（i）和正交（q）信号。 I和Q基带信号使用数字转换器的每秒类似物进行数字化数字化。第二个混合动力车是使用字段可编程栅极阵列数字实现的，以产生两个边带，每个边带的带宽为1.6 GHz。 2 x 1.6 GHz频段可以调节以覆盖上述阵列范围内的任何3.2 GHz窗口。可以通过均等I和Q基带信号之间的功率和延迟来获得高于20 dB的侧带拒绝率（SRR）。此外，应用校准时可以达到30 dB以上的SRR。
This report presents a down-conversion method involving digital sideband separation for the Yuan Tseh Lee Array to double the processing bandwidth. The receiver consists of a MMIC HEMT LNA frontend operating at a wavelength of 3 mm, and sub-harmonic mixers that output signals at intermediate frequencies of 2 - 18 GHz. The sideband separation scheme involves an analog 90 degree hybrid followed by two mixers that provide down conversion of the IF signal to a pair of in phase (I) and quadrature (Q) signals in baseband. The I and Q baseband signals are digitized using 5 Giga sample per second analog to digital converters. A second hybrid is digitally implemented using field programmable gate arrays to produce two sidebands, each with a bandwidth of 1.6 GHz. The 2 x 1.6 GHz band can be tuned to cover any 3.2 GHz window within the aforementioned IF range of the array. Sideband rejection ratios (SRRs) above 20 dB can be obtained across the 3.2 GHz bandwidth by equalizing the power and delay between the I and Q baseband signals. Furthermore, SRRs above 30 dB can be achieved when calibration is applied.
