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本文叙述研制成功的表面声波63位双相编码延迟线,中心频率为70MHz,编码速率为5Mbit/s,编码长度为12.6μs。 该器件从第33位到63位的编码内容是第1位到第31位编码序列的重复,即构成一个等价平移的M_(32)序列。这是为某种特定的信号处理格局专门研制的器件,在时分多制扩频通信系统中用于实现时钟的快速精密同步。器件制作于ST石英基片上,因而具有良好的温度稳定性,同时为充分发挥SAW器件由于使用平面工艺制作而具有的一系列优点,在设计中实现不同调谐匹配电感仍使器件的插入损耗处于在实用上可以接受的量级。实际测试表明,器件的主要性能指标,即自相关峰值与旁瓣比接近理论值,且在实际使用中已获得良好效果。
This paper describes the successful development of surface acoustic wave 63-bit dual-phase encoding delay line, the center frequency of 70MHz, encoding rate of 5Mbit / s, encoding length of 12.6μs. The code from the 33rd bit to the 63rd bit of the device is a repetition of the coding sequence from the 1st bit to the 31st bit to form an M_ (32) sequence of equivalent translation. This is a device that has been specially developed for a specific signal processing pattern and is used to achieve fast, precise synchronization of the clock in a time-division multi-system spread spectrum communication system. The device is fabricated on an ST quartz substrate and therefore has good temperature stability. To achieve the full benefits of SAW device fabrication using a planar process, achieving different tuning-matched inductors in the design still places the insertion loss of the device at Practically acceptable magnitude. Practical tests show that the main performance indicators of the device, that is, the peak value of autocorrelation and the sidelobe ratio close to the theoretical value, and have achieved good results in actual use.