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laforge, 02/19/2016 10:49 PM
This modem design is used in the GT-001, GTA01, GTA02, early HXD8 and possibly a number of other older FIC GSM products.
It is a tri-band GSM modem design with support for GPRS.
The block layout of this modem looks like this:
Image(calypso-block.png)
- Yellow: Clocks
- Red: Digital Serial interfaces like SPI
- Green: Analog I/Q differential baseband data
- Magenta: RF signals
- Blue: TSP, the time sequence port, sometimes parallel, sometimes serial
Glossary: * ABB: Analog Base Band * AFC: Automatic Frequency Correction (tuning of the VTXCO by ABB) * APC: Automatic Power Correction (Tx Power envelope from ABB to PA) * BSP: Baseband Serial Port, like SPI * DBB: Digital Base Band, like SPI * USP: uController Serial Port * RFCLK: A 26MHz master clock generated by the Transceiver * CLK13M: 13MHz system clock provided by DBB * CLK32K: A 32.768kHz RTC clock signal
Updated by laforge about 8 years ago · 3 revisions