GC5316 datasheet(26/75 Pages) TI

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GC5316

SLWS154A − JANUARY 2004 − REVISED MARCH 2004

www.ti.com

The outputs of all DUCs drive four independent complex sum chains. Any DUC can contribute (or not) to any or all

of the four sum chains. The output of a DUC block’s sum chain drives the sum chain input of the next block. The first

DUC to output data is DUC0, while the last is DUC11. The four outputs of a DUC are the sum of all the contributing

channels of all the higher numbered DUC blocks and itself. The sum chain inputs of DUC 11 are grounded. Within

the chain, all DUC blocks from 0 up to the highest numbered DUC in use must be turned on otherwise the sum chain

is broken.

The transmit output interface takes the four summed chains of DUC output data from the output of DUC 0 and then

scales and rounds to a user-programmed number of bits. Composite power meters with programmable integration

periods and intervals compute the power in each of the four output streams. The data is then formatted for output

over the four tx_data_out outputs.

3.1

Digital Upconvert Block (DUC)

Six Stage

CI C Filter

Interp 4 − 32

Serial

Interface

I,Q

Programm able

FI R Filter

Interp by 2

Compensating

FI R Filter

Interp by 2

Serial

Gain

F requency

Phase

Delay Adjust

Sum 1

Input

NCO

Sum 1

Output

Sum2

Input

Sum2

Output

Sum3

Input

Sum3

Output

Sum4

Input

Sum4

Output

To Next Transmit Channel

FromPreviousTransmitChannel

RMS

Power Meter

Round

4 signontop

16 data

15 zeros on bottom

5 guard on top

18 data

13 on bottom

Pilot

Insertion

(UMTS only)

CDMA A& Bchannels, or1 UMTS channel

Figure 21. Digital Upconvert Block

This section describes the functions available in each of the 12 DUC blocks. Each DUC block has its own register

set and may be programmed individually. The final output rates must match since they are added together.

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