Wireless equipment front-end ICs

13 April 2011 Telecoms, Datacoms, Wireless, IoT

Analog Devices introduced mixed-signal front-ends (MxFEs) designed to reduce power and board space for developers of wireless infrastructure and portable radio equipment. The 12-bit AD9963 and 10-bit AD9961 are targeted primarily at cost-sensitive wireless equipment, such as femtocell and picocell base stations, that require highly integrated dual transmit-and-receive functions.

The two ICs are pin-compatible and each integrate two ADC (analog-to-digital converter) channels with sample rates to 100 MSps and two DAC (digital-to-analog converter) channels with sample rates to 170 MSps. Also integrated onto the devices are digital interfaces with flexible clocking options. The devices have five auxiliary analog channels consisting of two 12-bit DACs, two 10-bit DACs and a 12-bit ADC. The ADC may be used to measure and monitor multiple points, both internal and external. The transmit path is configurable for 1x, 2x, 4x and 8x interpolation, and the receive path includes a bypassable 2x decimating low-pass filter. The AD9963 also integrates auxiliary LDO (low dropout) voltage regulators that allow the device to be powered from a single supply and further reduce external component count.

The MxFEs boast SNR (signal-to-noise ratio) of 66,5 dB and ACLR (adjacent-channel leakage ratio) of 72 dBc. Power consumption is 425 mW at maximum sample rates; transmit path power consumption is less than 100 mW at 170 MSps @ 1,8 V; and receive path power consumption is less than 350 mW at 100 MSps @ 1,8 V. The devices also offer sleep and power-down modes, and support full- and half-duplex data interfaces.

The AD9963 and AD9961 can be coupled with Analog Devices’ ADF4602 3G multiband transceiver, ADL5501 RMS power detector as well as RF amplifiers, such as the ADL5320, ADL5542 and ADL5601 products to create a complete femtocell radio.

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