GC1115IZDJ datasheet(4/82 Pages) TI

Part #	GC1115IZDJ

Description	Crest Factor Reduction Processor

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V

in

V

out

13 dB

input PAR

7 dB

output PAR

GC1115

provides

6 dB peak

reduction

= 8%

V

in

V

out

13 dB

input PAR

7 dB

output PAR

GC1115

provides

6 dB peak

reduction

PA efficiency before GC1115:

Avg PA output (10 W )

DC power (125 W)

= 8%

Input Signal

Average Power

(0 dB Point)

1 dB Compression Point

(maximum output)

V

in

V

out

13 dB

input PAR

6 dB less

PA back −off

PA efficiency after

Avg PA power (20 W)

= 16%

7 dB

output PAR

V

in

V

out

13 dB

input PAR

PA efficiency after GC1115:

DC power (125 W)

= 16%

7 dB

output PAR

Input Signal

Average Power

1 dB Compression Point

(maximum output)

Output Signal

Average Power

GC1115

SLWS144C – FEBRUARY 2005 – REVISED JUNE 2006

Figure 2. Reducing the Peak-to-Average Ratio (PAR)

However, since the peak-to-average ratio of CDMA signals is so high, the average power is relatively low,

consequently resulting in a low PA efficiency (output power divided by input power). By decreasing the

peak-to-average ratio, the average power of the peak-reduced signal at the output of the GC1115 can be

increased, decreasing PA back-off thus also increasing PA efficiency.

Figure 3 illustrates that the decrease in PAR can then be used to increase the average signal power while still

keeping the peaks below the PA’s 1 dB compression point. The GC1115 can typically limit the output PAR of

CDMA signals to between 6 dB and 7 dB while still meeting all relevant 3GPP or 3GPP2 requirements. This

decreased PAR enables a 2 dB to 3 dB increase in PA drive, which in turn allows PA manufacturers to achieve

2 dB to 3 dB more PA output power. As PAs represent a significant percentage of the capital equipment cost of

base stations, using a 10 W PA instead of a 20 W PA (for example) significantly decreases base station costs.

Figure 3. Increasing PA Efficiency

4

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