Cutting power consumption in femtocell base stations
31 August 2010
ADI has released 12bit and 10bit MxFEs that reduce power and board space.
The mixed-signal front-ends have been specifically designed for developers of wireless infrastructure and portable radio equipment.
The 12bit AD9963 and 10bit AD9961 MxFEs use 40% less power and occupy 25% less PCB area than other devices, without sacrificing performance. These MxFEs are especially effective for cost-sensitive wireless equipment, such as femtocell and picocell base stations that require highly integrated dual transmit-and-receive functions.
AD9963 and AD9961 are pin-compatible, low-power MxFEs that each integrate two ADC channels with sample rates to 100 MSPS and two DAC channels with sample rates to 170 MSPS. The MxFEs enable up to 10dB better ACLR (adjacent-channel leakage ratio) performance than other devices, easing design and filtering requirements while consuming less power.
Also integrated onto the devices are digital interfaces with flexible clocking options. The MxFEs have five auxiliary analogue channels consisting of two 12bit DACs, two 10bit DACs and a 12bit 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 by-passable 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 can be coupled with ADI’s ADF4602 3G multi-band transceiver, ADL5501 RMS power detector as well as RF amplifiers, such as the ADL5320, ADL5542 and ADL5601 products to create a complete femtocell radio.
“For RF design engineers designing small-scale wireless communication equipment, Analog Devices’ new MxFEs reduce power and component count,” said Chris Jacobs, Product Line Director for Analog Devices. “The low-power, highly integrated transmit-and-receive paths of our new front-end ICs help customers simplify their designs to meet aggressive cost targets while still providing industry-leading data converter dynamic range.”
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