Vega; Functional Description - Panasonic EB-GD90 Technical Manual

8

VEGA

8.1 Introduction
VEGA contains the interface circuits to the Audio, RF and auxiliary analogue functions for the baseband circuit.

8.2 Functional Description

8.2.1 Uplink I and Q
VEGA performs GMSK modulation on Data samples received from GEMINI at 270 kbits per second.
Timing interface
Din
Register
270 kHz
Differential
Encoder
Power
Register
10089-1
MCUK990801G8
Technical Guide
http://cxema.ru
TIMING
10 bit
I DAC
BURST
GMSK
STORE MOD
10 bit
Q DAC
FILTER
SIGMA-DELTA
FILTER
SIGMA-DELTA
RAMP DATA
DSP INTERFACE
Burst Burst Timing
Control
Gaussian
Filter
Ramp-up
Shaper
To Power
control DAC
Figure 8.2: Functional structure of the baseband uplink path
JTAG
SIGMA
FILTER
DELTA
FILTER
FILTER
SIGMA
FILTER
8 bit DELTA
8 bit
10 bit
DAC
8 bit
DAC
SP INTERFACE
13 bit
DAC
Figure 8.1: VEGA Block Diagram
Offset
Register
Cosine
Table
Integrator
phase(i) 16 *270 kHz
Sine
Table
Offset
Register
Section 8
– 35 –
8 bit
DAC
10088-1
Low Pass
8 bit DAC
Filter
Low Pass
8 bit DAC
Filter
VEGA
ULIP
ULIN
ULQP
ULQN
Issue A
Revision 0