TypicalCalypsoModemDesign » History » Revision 3
Revision 2 (laforge, 02/19/2016 10:49 PM) → Revision 3/12 (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
