A 22 mA 3.7 dB NF direct conversion receiver for 3G WCDMA

Wireless Internet is currently available in extended narrowband cellular systems. However, the wider channel bandwidths in third-generation systems will further improve multimedia services and capacity. The direct conversion receiver is a distinct alternative for wide-band direct sequence CDMA systems in high-speed cellular communications. However, the wide bandwidth in the 3.84 MHz transmission leads easily to large power consumption in the receiver, particularly when trading off with the dynamic range limitations of the direct conversion architecture. This design achieves 3.7 dB NF and -16 dBm IIP3 with only 22 mA. The single-chip receiver includes a low-noise amplifier (LNA), downconversion mixers, analog channel selection filters, variable-gain amplifiers (VGA), and 6 b A/D converters (ADC).

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