Analog Devices has released two new RF ICs for broadband communications systems – the ADRF6655 active mixer and ADRF6510 dual programmable filter and VGA (variable gain amplifier).
Operating within the 100 to 2500 MHz frequency range, the ADRF6655 is a single-chip, broadband, active mixer with a fully integrated fractional-N phase locked loop (PLL) synthesiser, voltage controlled oscillator (VCO) and associated low dropout (LDO) regulator circuits. It provides high performance for both up- and down-conversion applications, and its PLL and VCO provide a fully integrated LO (local oscillator) circuit that can also be brought off-chip for external use. The mixer operates on a single +5 V supply and features input linearity IP3 of +29 dBm, input compression (P1dB) of +14 dBm, conversion gain of 6 dB, noise figure of 12 dB and LO phase noise of -111 dBc at 100 kHz offset.
The ADRF6510 is a dual-channel, fully differential baseband signal processing solution that integrates a matched pair of fully differential low-noise and low-distortion programmable filters and VGAs onto a single chip. The matched filter networks provide flexibility as the corner frequency is fully adjustable in 1 MHz steps, thereby enabling wideband and narrowband support within a single radio design.
The ADRF6510 VGA provides an adaptable multi-stage adjustable gain control range of 50 dB and a pre-amp prior to the filters provides a 6 dB step, while the VGAs that follow the filter networks provide gain range of -5 dB to +45 dB. This allows the user to select and optimise the gain range for high dynamic range radios and eases the drive requirements into the analog-to-digital converter. The chip provides low distortion > 60 dBc IMD3 suited for high-order QAM modulation, quadrature (I-Q) communications systems supporting high bandwidth signals up to 56 MHz.
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