• AD8349 IQ inputs

    I had a question regarding the IBBP/IBBN and QBBP/QBBN input levels as the datasheet seems to contradict itself. The pin descriptions on page six (or page 15) state that the differential inputs:

    • Must be biased to 400 mV
    • 600 mV p-p on each pin
  • EVAL-AD8349 material

    I wander the EVAL-AD8349 evaluation board material ,is it FR4 or Rogers material , I can't make sure that if the FR4 material board can go 2.4 GHz

    signal well.In the meanwhile,I used FR4 material at a two layer board to operate AD8349,finding it too…

  • AD8349 input LO signal

    I want to ask the input LO signal is best -6dBm , but I wonder is this -6dBm means the initial single-end -6dBm or each pin -6dBm of difference signals.

    in the meanwhile, how the LO difference signals do into the AD8349 chip,first add two difference signals…

  • ADF4360-3 leakage into AD8349 inputs

    I'm observing LO leakage into the inputs (pins 1 & 2 and 15 & 16) of an AD8349 modulator in a direct conversion transmitter (tuned to 942.8 MHz).  The analog inputs to the modulator originate from an AD9763 DAC with a low-pass anti-aliasing…

  • ADL5385/5382 vs AD8349/8347

    What is the main difference between these two RF quadrature modulator?

    Comparing the noise figure, IIP3, it seems ADL5382/5385/5375 solution have more SNR advantage over the other. Is it true?

  • AD8349的载波抑制问题

    贵公司的专家好,我最近在使用AD8349调制器进行ASK调制和BPSK调制,DAC用的是AD9777,但是调制出来的本振载波抑制只有-10dBc,比一般的系统要求(-20dBc)低很多。I路的基带信号直流偏置已经调到了400mV,峰峰值约为200mV,AD9777都是默认配置,不知道我调哪些地方可以改善载波抑制啊

  • 如何实现AD9958和AD8349的接口电路,试了好久没有实现SSB。

    AD9958工作在FSK模式,已经实现。需要正交上变频到2.4g,LO使用ADF4360-1,采用的是成熟电路。AD9958和AD8349的接口电路,试了好久没有实现SSB。我采用的办法是,调节AD9958的上拉电阻,使两个通道每个输出为0.6VPP。然后电容隔离直流偏置,通过电阻分压生成0.4v直流偏置,不知道方案可行性如何。

  • 请问I/Q正交调制器AD8346与AD8349可以用于单I或单Ql输入吗?

    如题,如果可以用,应该怎么用?如果不能用,有何建议?

  • ADF4360-1 output phase

    Is the two output:RFAout and RFBout the differencial signals?Is the two signals' phase difference 180 deg ?

    Or they are actually in-phase signals?

    I have tried it to find they are of same phase,so it confused me a lot ,because the ADF4630-1 is directly…

  • What is the difference between a modulator and a vector modulator?

    The circuit description for the quadrature modulators seems to be the same for the vector modulators. As an example compare the AD8349 modulator with the AD8341 vector modulator. Both split the RF input with a 90 degree difference, then independently…