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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
Figure 1:
VEGA Block Diagram
600-0801
8.2.1 Uplink I and Q
VEGA performs GMSK modulation on .dData samples received form GEMINI at 270Kbits per second
Figure 2:
Functional structure of the baseband uplink path
600-0802
MCUK980101G8
Section 8
Issue 1
Technical Guide
8 - 1
Revision 0
VEGA
TIMING
JTAG
10 bit
DAC
SP INTERFACE
Timing interface
Din
270 Khz
Burst
Register
Burst Timing
control
Differential
Encoder
Gaussian
Filter
Integrator
Power
Register
Ramp-up
Shaper
To Power
control DAC
Offset
Register
Cosine
Table
phase(i) 16 *270 Khz
sine
Table
Offset
Register
8 bit DAC
8 bit DAC
Low Pass
Filter
Low Pass
Filter
ULIP
ULIN
ULQP
ULQN