GC1115TIThe GC1115 is a flexible, programmable, wideband crest factor reduction (CFR) processor with a maximum composite bandwidth of 32MHz (4 clocks/complex sample, one channel) or 16MHz (8 clocks/complex sample, two channels)
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GC1115TI
制造商:
TI
制造商型号#:
GC1115
百芯编号#:
CM637313510
价格(CNY):
百芯库存:
253
个
库存地点:
可供应量:
183
个在库
此为供应商库存，需要与销售确认
产品描述:
The GC1115 is a flexible, programmable, wideband crest factor reduction (CFR) processor with a maximum composite bandwidth of 32MHz (4 clocks/complex sample, one channel) or 16MHz (8 clocks/complex sample, two channels)
The GC1115 is a flexible, programmable, wideband crest factor reduction (CFR) processor with a maximum composite bandwidth of 32 MHz (4 clocks/complex sample, one channel) or 16 MHz (8 clocks/complex sample, two channels). The GC1115 selectively reduces the peak-to-average ratio (PAR) of wideband digital signals provided in quadrature (I and Q) format. By reducing the PAR of digital signals, the efficiency of follow-on power amplifiers (PAs) is improved, the D/A converter requirements are eased, and the out-of-band spectral regrowth caused by simple hard limiting is eliminated.
Manufacturers of 3G BTS equipment can realize significant savings on power amplifier costs by including the GC1115. The GC1115 meets multicarrier 3G performance standards (PCDE, composite EVM, and ACLR) at PAR levels down to 6 dB. The GC1115 integrates easily into the transmit signal chain, between a digital upconverter such as the Texas Instruments GC5016 or GC5316 and a high-quality D/A converter, such as the Texas Instruments DAC5687.
the GC1115 can be interleaved or parallel complex. The GC1115 uses four cascaded stages of peak detection and cancellation (PDC) to remove over-threshold peaks from the input signal. Each PDC stage can be independently programmed with detection target peak levels and cancellation pulse coefficients. A pool of 32 cancellation pulse generators can be flexibly assigned in groups of 4 to any PDC stage. Real or complex FIR cancellation coefficients are preprocessed into coefficients and derivative values. Cancellation pulses are designed to match the user"s carrier frequency allocation. Cancellation pulse energy is bandlimited and thus is only added within allocated carrier bands. The GC1115 peak cancellation algorithm has minimal effect on the ACLR of the signal. The CFR data can be interpolated and output in complex or real formats.
Input sampling rates to 130 Msps are supported, in either parallel or multiplexed I/Q modes, and in either 2s complement or unsigned format. The GC1115 includes an interpolator that increases the output sampling rate by 2× or 4× and optionally modulates the output signal to the fs/4 center frequency. Output sampling rates to 130 Msps are supported in either parallel or multiplexed I/Q modes, and in either 2s complement or unsigned format. A special one-channel, 2× output mode uses both GC1115 output ports to carry odd/even real output samples. Dual on-chip RAM provides either time-domain snapshots or long-term histogramming of the internal peak cancellation signal chain at five user-selected points, enabling real-time monitoring of the CCDF function. A power-level meter monitors either the GC1115 input or output power level.
Reduces Signal Peaks to ≥ 6 dB PAR
One- and Two-Channel Operation
Programmable PAR With Four Stages
Programmable Cancellation Pulse Coefficients
256-Ball PBGA Package, 17-mm × 17-mm
1.2-V Core, 3.3 V I/O
APPLICATIONS
3GPP (W-CDMA, HSDPA) Base Stations
3GPP2 (cdma2000) Base Stations
TDSCDMA Base Stations
PAPR Reduction of OFDM, Wibro, OFDMA Signals
Two-Channel Transmit Diversity Applications
Operates With TI DAC5687 (500 Msps)
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