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TypicalCalypsoModemDesign » History » Revision 3

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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

Files (2)
calypso-block.png View calypso-block.png 44.1 KB openmoko calypso modem block design laforge, 01/16/2009 07:34 AM
c123_pcb.jpg View c123_pcb.jpg 669 KB zecke, 02/21/2016 10:02 AM

Updated by laforge about 8 years ago · 3 revisions

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