• HMC699 spurs


    I have a design based on the HMC699 PLL and HMC584 VCO with a CW output of 13.6GHz. Everything works just fine and the phase noise measurements match the simulation very good. However I have several high spurs close to the F0. The ref oscillator…

  • HMC699 Programming Registers

    Hi All,

    I am involved in a new design based on HMC699, I need to generate a 5920MHz signal with a reference input of 20MHz.

    I have simulated the system using ADISim PLL and the chip programming assitant Gives me 37 (with other names) for the programming…


    Hi all,

    We have built our prototype following the indications form the datasheet and the circuit example but it does not work, there is no Loop Lock and the HMC699 gets very very hot. The system must lock to 5920MHz, we asked for the programming registers…

  • HMC699 Differential active loop filter help

    Hi There,

    I have inherited a design which uses a HMC699 Integer N PLL chip to lock an external VCO @ 4.6GHz using an external 10MHz reference clock.


    The Up/Down PFD outputs are…

  • Simulation models for HMC699 (PLL) with HMC583 (VCO)

    I need to design a 12-13 GHz low-noise frequency synthesizer based on the HMC699# PLL# and the HMC583# VCO#.

    Is it possible to have their models to simulate this system with Hittite's design tool v1.15 that I have downloaded from your site?

    By the…

  • Re: Simulation models for HMC699 (PLL) with HMC583 (VCO)

    Hi Huangzeyan,

    Thank you very much for your useful answer.

    I have still a couple of questions:

    1) Which is the best opamp you may suggest to keep the phase noise as low as possible?

    2) I am missing the reason why the phase detector gain is set to…

  • ADI SIM PLL - How to use the RFOUT/2 pin on an ADI VCO in a simulation?

    Hi all,

    I'm trying to recreate the PLL design that is in the HMC699 datasheet on page 11 (https://www.analog.com/media/en/technical-documentation/data-sheets/hmc699.pdf).

    First I would like to simulate it exactly in ADI SIM PLL.

    So far this is the…

  • RE: HMC3716 PFD in adiSimPLL

    Hi there,

    Please reference the EZ post below. The documents referred apply to all HMC PFD / INT PLL products including the HMC439, HMC440, HMC3716, HMC4069, HMC698 and HMC699.


    Best Regards,


  • RE: What is the phase noise of HMC439 at 10Hz offset for 10 MHz pdf?

    Hi Mustafa,

    The alternatives to the HMC440, which include LD, INV, and internal 200 ohm pull ups would be the HMC4069, HMC698, HMC699.  Each one has similar performance, just different divide ratios, so pick the one that suits your application.


  • RE: 锁相环芯片芯片底噪问题