字数:11800,页数:34
摘要:本设计是一射频锁相环频率合成器,可用于无线电接收和发射机中上、下变频器的本振部分。采用的是模拟装置公司的ADF4116系列芯片。简要介绍了芯片内低噪声的数字PFD(相位频率检测器)、可编程的参考(基准)分频器、多路调制器、可编程A和B计数器、双模式充电泵、5位的A和13位的B计数器等部分。该芯片集成度高,性能好,成本低。结合外部VCO和环路滤波器可以很好的实现快速锁相功能。可以对信号通过编程来实现分频,从而可以实现精确的频率合成输出。芯片所有内存储器是经过简单的3线口控制,器件工作电压可以是2.7V到5.5V,待机时为低功耗使用。 关键字: 频率合成 可编程寄存器 锁相环 可编程分频器 Abstract: This design is a RF PLL frequency synthesizers. Can used frequency synthesizers can be used to implement local oscillators in the up-conversion and down-conversion sections of wireless receivers and transmitters. It is analogue device corporate ADF4116 series chip to adoptive. Summariness introduce know clearly on-chip low noise digital PFD(phase frequency detector), programmable reference(base)Frequency divider, multiplexer, programmable A and B counter, the dual-modulus prescaler, both 5 bit A and 13 bit B counters, etc. This chip have a high integrated level, performance best, cost low. Both incorporation exterior VCO and loop filter could rattling realize celerity Phase Lock function. Could versus signal passing programme came realize frequency demultiplication, could realize precise frequency synthesis output. It is transit simple three strung mouth control to chip possession internal storage.It is 2.7v to 5.5v to the device Working Voltage could, at the readiness ,low power dissipation use. Key word: frequency synthesis phase locked loop
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