National Semiconductor Corp. (Santa Clara, CA) has introduced the LMH6522 quad-channel and LMH6521 dual-channel digital variable gain amplifiers for multi-channel wideband wireless radio systems. Applications include intermediate frequency sampling receivers, I/Q digital pre-distortion signal paths, and wide-bandwidth direct-conversion radios used in multicarrier GSM, TD-SCDMA, W-CDMA, and LTE wireless base stations.
Both models are suited for driving high-speed ADCs. Features of the LMH6522 include 1 dB gain steps over a 31 dB range, noise figure of 8.5 dB at maximum gain, and 49 dBm at 200 MHz input frequency. The LMH6521 features 48.5 dBm at 200 MHz input frequency, channel gain/phase matching of ±0.04 dB/±0.45 deg, and 0.5 dB gain steps over a 31.5 dB range.
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