TypicalCalypsoModemDesign » History » Revision 4
Revision 3 (laforge, 02/19/2016 10:49 PM) → Revision 4/12 (Anonymous, 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