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Integrated RF ICs save space in comms apps

Posted: 12 Apr 2010 ?? ?Print Version ?Bookmark and Share

Keywords:RF IC? broadband? communications? amplifier?

Analog Devices Inc. has launched two RF ICs for broadband communications systems that can reduce component count by more than 75 percent in point-to-point radios, wireless base stations, cable infrastructure and communications test equipment, without compromising performance.

The ADRF6655 active mixer or ADRF6510 dual programmable filter and variable gain amplifier (VGA) integrate multiple functions and discrete devices into a single monolithic chip, reducing component count by a factor of four when compared to traditional discrete RF designs.

Operating within the 100MHz to 2500MHz frequency range, the ADRF6655 device is a highly-flexible, single-chip, broadband, active mixer with a fully integrated fractional-N PLL synthesizer, voltage-controlled oscillator (VCO) and associated LDO circuits. The PLL and VCO provide a fully integrated LO (local oscillator) circuit that can also be brought off-chip for external use. The ADRF6655 active mixer operates on a single +5V supply and features input linearity IP3 (+29dBm); input compression P1dB (+14dBm); conversion gain (6dB), noise figure (12dB) as well as LO phase noise of -111dBc at 100kHz offset.

The ADRF6510 is dual channel fully-differential baseband signal processing solution that integrates a matched pair of fully differential low-noise and low-distortion programmable filters and variable gain amplifiers onto a single chip. The ADRF6510 replaces complex, bulky discrete fixed function filters, saving considerable board area. The matched filter networks provide high flexibility as the corner frequency is fully adjustable in 1MHz steps, thereby enabling wideband and narrow band support within a single radio design, a key benefit since the available spectrum and bandwidth varies across markets and regions worldwide.

The ADRF6510 VGA provides an adaptable multi-stage adjustable gain control range of 50dB, a pre-amp prior to the filters provide a 6dB step; while the variable gain amplifiers that follow the filter networks provide gain range of -5dB to +45dB. This allows the user to select and optimize the gain range for high dynamic range radios and eases the drive requirements into the analog to digital converter.

In 1,000 units, the ADRF6655 is priced at $9.98 per unit, and the ADRF6510 at $8.99. The ADRF6655 and ADRF6510 are available in 6mm x 6mm 40-pin and 5mm x 5mm 32-pin LFCSP packages, respectively.

- Ismini Scouras

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