High-speed data converters maximise receiver sensitivity and dynamic range for 3G and 4G cellular base stations
May 26, 2011 // Paul Buckley
Analog Devices Inc. has introduced four high-speed data converter products that support signal sampling rates necessary to accommodate multi-carrier radio platform requirements for today’s 3G and 4G cellular infrastructure communication- standards, including CDMA2000, UMTS/LTE, TD-SCDMA and TD-LTE.
The AD6649 is the industrys first IF diversity receiver able to monitor the incoming signal power and adjust the VGA gain setting directly without the need for a microprocessor. It integrates many of the functions required for a diversity receive path in a single device, including an ultra-low-latency peak detector and a rms signal power monitor. There is also an integrated DDC (digital down converter) that includes a 32-bit NCO (numerically-controlled oscillator), a decimating half-band filter and an output FIR (finite-impulse response) filter that provides an effective band-pass filtering function and reduces the output rate.
The AD6643 is an IF diversity receiver for cost-sensitive applications that integrates two high performance A/D converters and noise shaping requantiser (NSR) digital blocks. The integrated NSR circuitry allows for improved SNR (signal-to-noise ratio) performance in a smaller frequency band within the Nyquist bandwidth. With the NSR feature enabled, the outputs of the A/D converters are processed such that the AD6643 supports enhanced SNR performance within a limited portion of the Nyquist bandwidth while maintaining 11-bit output resolution. The NSR block can be programmed to provide a bandwidth of either 22 percent or 33 percent of the sample clock.All news
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