Tunable Passive Polyphase Network

Discussion in 'Wireless & RF Design' started by BR-549, Mar 21, 2017.

  1. BR-549

    Thread Starter Distinguished Member

    Sep 22, 2013
    OK...found another interesting circuit.

    Tunable, passive, poly-phase network.

    I was doing a general search for I Q modulators and came across this.


    Figure 14. And don't presume I read everything down to this point. I like the pictures.

    Anyhow.....what a great idea. Should have thought of it.

    Using a MOS transistor....as a variable resistor......for precise resistance control per node.

    Has anyone seen this before?