| commit | e82faa7034772cd7896be0ea1db75e9dde228f4a | [log] [tgz] |
|---|---|---|
| author | Jeff DiCorpo <jeffdi@efabless.com> | Fri Feb 19 02:11:54 2021 -0800 |
| committer | Jeff DiCorpo <jeffdi@efabless.com> | Fri Feb 19 02:11:54 2021 -0800 |
| tree | ca17bc4d08ac02c9595952877c12990c14c2f7c7 | |
| parent | 9e2226cce51ceeb176b31130992c845527d69800 [diff] |
final gds & drc results
This is the Google/EFabless/Skywater Caravel submission of the Amateur Radio Satellite Transceiver.
These blocks serve as the first pieces in a larger design of an open source amateur radio satellite transceiver - this is the first tapeout submission.
The design sources of the continued project can be found here: amsat_txrx_ic.
VCO Layout
A S-Band phase locked loop employing a differential ring oscillator VCO with quadrature outputs. CML (Current Mode Logic) and flip-flop based pre-scaler dividers are used with a fractional-N divider which uses a 3rd order MASH structure with dithering. Finally a PFD (Phase Frequency Detector) is combined with a charge pump with off chip filtering to complete the loop.
A cell based buffer is used to drive the external 100 ohm differential output.
Bandgap Layout
A bandgap reference with separate PTAT and CTAT currents. Provides less than +/-0.2% variation from -40 to 125 degrees celcius (tt simulation). 6 bits of trimming on both PTAT and CTAT allows less than 1% accuracy over process variations.
To install the environment used for development of this repository, follow these instructions.
git clone https://github.com/yrrapt/sky130_setup.git cd sky130_setup ./install_pdk.sh ./install_tools.sh
cd amsat_txrx_ic-caravel/xschem xschem
cd amsat_txrx_ic-caravel/gds klayout caravel.gds
cd amsat_txrx_ic-caravel/utils ./run_drc amsat_txrx_ic-caravel
cd amsat_txrx_ic-caravel/utils ./run_drc amsat_txrx_ic-caravel
