Information processing . guide for the definition of 4 - bit character sets derived from the 7 - bit coded character set for information processing interchange 信息处理.交换用位编码字符组派生的千位字符组的定义指南
Detail specification for electronic components . semiconductor integrated circuit ct54ls169 ct74ls169 4 - bit binary up down synchronous counter 电子元器件详细规范.半导体集成电路ct54ls169 ct74ls169型4位二进制同步加减计数器
Detail specification for electronic components . semiconductor integrated circuit ct54161 ct74161 4 - bit synchronous binary counter direct clear 电子元器件详细规范.半导体集成电路ct54161 ct74161型4位二进制同步计数器异步清除
Finally , it takes a detailed test to the processed millimeter 4 - bit digital phase shifter . the test result is better than expectant guideline : the maximum of the phase error is 10 , the insertion loss is better than 10 . 74db , the return loss is more than - 14 . 88db in the 33 . 9ghz 34 . 5ghz frequency band . the whole volume of the phase shifter is 80mm 35mm 20mm 最后,对加工出的毫米波四位数字移相器进行了测试,测试结果完全达到了预定指标要求:在所要求的33 . 9ghz 34 . 5ghz频带内,最大相移误差小于10 ,插入损耗小于10 . 74db ,输入输出回波损耗大于- 14 . 88db ,整个电路尺寸为80mm 35mm 20mm 。
The research of this paper is much practical . this dissertation discusses the work principles of several digital phase shifters respectively , and describes their characteristics . based on this , the milimeter 4 - bit digital phase shifter is designed by using different circuit format with 71 main line microstrip , incorporating the guideline and the level of process 在此基础上,结合所给的指标要求和实际的加工工艺水平,采用71的微带线作为移相器的主线,四位移相位采用了不同的电路形式,针对大移相位相位精度误差大的缺陷对传统的反射型移相器电路进行了改善,设计出了毫米波四位数字移相器。
