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Fixed typos

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tomdot-dev 2021-06-17 19:03:50 +02:00
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@ -18,7 +18,7 @@ CaribouLite has been submitted to CrowdSupply and has been pre-launched! [Visit
# Hardware Revisions
**A working prototype version** of the board ([REV1](hardware/rev1)) has been produced and tested to meet product requirements.
In a meanwhile, a second revision of the board is being produced with the following main updates (see picture below):
In the meantime, a second revision of the board is being produced with the following main updates (see picture below):
1. Image rejection filtering improvement - U10 and U12 (HPF & LPF) - have been replaced by integrated LTCC filters by MiniCircuits
2. Removing FPGA flash - redundant given the fact that the the RPI configures the FPGA in <1sec over SPI.
3. Board layout improvements and overlays (silkscreen) beautification (including logo)
@ -52,7 +52,7 @@ In CaribouLite-R2 the PCB design has been thoroughly re-thought to meet its educ
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<B>Note</B>:
The gaps are defined by the design constarints of the system and may not exist in real-life hardware. Actual modem synthisizer outputs test show wider margins ar room temperature than those written in the datatsheet, but, as noted by Microchip, performance may suffer.
The gaps are defined by the design constraints of the system and may not exist in real-life hardware. Actual modem synthesizer outputs test show wider margins at room temperature than those written in the datatsheet, but, as noted by Microchip, performance may suffer.
<B>FPGA specifications:</B>
@ -83,8 +83,8 @@ Receive noise figure | <4.5 dB | <4.5 dB @ 30-3500 MH
1. Rasperry-Pi 40-pin connector
2. A modem - AT86RF215
3. TCXO - 0.5 ppm @ 26 MHz
4. FPGA - ICE40LP serier from Lattice Semi.
5. A frequency mixer with integrated synthysizer - RFFC5072
4. FPGA - ICE40LP series from Lattice Semi.
5. A frequency mixer with integrated synthesizer - RFFC5072
6. External reference clock connector (may be used to acheive coherence between many CaribouLite units.
7. A PMOD connector for FPGA expantion
8. RPI configuration EEPROM (following RPI-HAT specifications)