Michael Ossmann a4a007ed75 HackRF One: AC couple CLKIN
We've always specified that CLKIN should be DC (based on the Si5351C
documentation), but it has worked with AC input.  AC coupling the buffer
input restores this undocumented feature.
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Copyright 2012-2022 Great Scott Gadgets

These files are part of HackRF.

This is a free hardware design; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

This design is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this design; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 51 Franklin Street,
Boston, MA 02110-1301, USA.


HackRF One is a wideband software radio transceiver with a USB interface.

hardware notes:

Schematic and layout files were designed in KiCad, an open source electronic
design automation package.

order of copper layers:
    Copper 1:  C1F (front)
    Copper 2:  C2
    Copper 3:  C3
    Copper 4:  C4B (back)

PCB description: 4 layer PCB 1.6 mm
    Copper    1   0.035 mm
    Prepreg 1-2   0.2104 mm
    Copper    2   0.0152 mm
    Core    2-3   1.065 mm
    Copper    3   0.0152 mm
    Prepreg 3-4   0.2104 mm
    Copper    4   0.035 mm

7628 prepreg with Er=4.6 (+/- 0.1)
required impedance: 50 ohm (+/- 5%) 11.55 mil microstrip impedance
double side solder mask green
single side silkscreen white
6 mil min trace width and
6 mil min isolation