C6748

DSP

GC6016

DUC-CFR

DDC

I/Q Mod

I/Q Mod

PA

PA

SW

Baseband

Data

DAC3283/3482

ADS41B49

TRF3703/3720

Complex

TX

Subsampled

Feedback

Mixer/BPF

Mixer/BPF

Mixer/BPF

LNA

LNA

ADS62P49

RX

FB

I/Q

I/Q

RX

Real

RX

B0442-02

ADC

ADC

ADC

DAC

DAC

GC6016

SLWS227A

– NOVEMBER 2010 – REVISED MARCH 2011

www.ti.com

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

DESCRIPTION (Continued)

The CFR block reduces the peak-to-average ratio (PAR) of the digital transmit signals, such as those used in

third-generation (3G) code division multiple access (CDMA) and orthogonal frequency-division multiple-access

(OFDMA) applications.

By reducing the PAR of the digital signal and the PA nonlinearity, the operational efficiency of follow-on power

amplifiers can be substantially improved.

In Table 1, feedback is normally associated with a DPD system. The GC6016 can use the feedback input as a

calibration antenna input to the capture buffer. Several architectures that provide performance and cost

optimization are listed in Table 1

Table 1. Sample Configurations for GC6016

Figure

TX Antenna

RX Antenna

Other

2 typical at 250 Msps, up to 4 at

Figure 1

2-62 MHz

Lower-cost 2-antenna solution

250 Msps

2 at 250Msps, 4 with lower-rate

Figure 2

2-62 MHz

2-antenna solution with full-rate real feedback

RX ADC

2 at 250Msps, 4 with lower-rate

2-antenna solution with complex feedback, lower

Figure 3

2-62 MHz

RX ADC

subsampling ratio

4 at 250Msps, 8 with lower-rate

Figure 4

4-31 MHz

Lower-cost 4 antenna solution

RX ADC

ANTENNA MODE EXAMPLE DIAGRAMS

Figure 1. Two-Antenna-Mode Subsampled-Feedback Diagram

2

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Product Folder Link(s): GC6016