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  • GaN FET in linear mode?

    From Phil Hobbs@21:1/5 to All on Fri Jul 11 11:21:35 2025
    Hi, All,

    I'm working on a new gizmo that needs a really fast, unipolar Class H
    current driver. (Ideally about 10 MHz bandwidth.) I don't need a huge
    slew rate, and the bandwidth requirement is mostly about having lots of
    loop gain at lower frequency.

    To reduce the gate drive requirements, I'm thinking about using a GaN
    FET in linear mode, with a headroom of a few hundred millivolts.

    Experiences? Wisdom? Thoughts?

    Cheers

    Phil Hobbs

    --
    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC / Hobbs ElectroOptics
    Optics, Electro-optics, Photonics, Analog Electronics
    Briarcliff Manor NY 10510

    http://electrooptical.net
    http://hobbs-eo.com

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  • From john larkin@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Fri Jul 11 09:12:24 2025
    On Fri, 11 Jul 2025 11:21:35 -0400, Phil Hobbs <[email protected]> wrote:

    Hi, All,

    I'm working on a new gizmo that needs a really fast, unipolar Class H
    current driver. (Ideally about 10 MHz bandwidth.) I don't need a huge
    slew rate, and the bandwidth requirement is mostly about having lots of
    loop gain at lower frequency.

    To reduce the gate drive requirements, I'm thinking about using a GaN
    FET in linear mode, with a headroom of a few hundred millivolts.

    Experiences? Wisdom? Thoughts?

    Cheers

    Phil Hobbs

    We are now designing a multisection snap-apart 4-layer proto board
    with a bunch of different GaN and SiC circuits. Different engineers
    will contribute circuits, manufacturing will build some boards, and
    we'll break them up and distribute them for testing. We hope to have
    them built in 3 to 4 weeks.

    Lots of the parts couldn't be soldered by hand, but my production
    people are really good.

    We can add a tile or two for you if you get us input.

    Consider a BUF602 as the gate driver.

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