Adding a new quadrature demodulator and dual gain trim amplifier for direct conversion receivers in next-generation cellular 3G / 4G and broadband wireless 802.16 applications, a global leader in high-performance semiconductors for signal processing applications, Analog Devices, Inc. continues to expand its radio frequency (RF) product portfolio. Allowing radio designers to apply the same device across a range of products and frequency variants, the ADL5380 demodulator is the industry’s first product capable of operating from 400 MHz to 6 GHz. Being designed to enable, integrate and cost reduce direct conversion radio receivers, the companion AD8366 is the industry’s first dual-channel digital gain trim amplifier (DGTA). Providing considerable board area and bill of material (BOM) savings, the combined two-chip solution can reduce the active component count by 60 percent within a radio design.
Base station receivers, with the ADL5380 demodulator, can be designed for a variety of cellular and broadband wireless data systems and standards including PHS, TD-SCDMA, W-CDMA, CDMA, LTE, and WiMAX. Including software-defined radio, due to the broad operating frequency range and wideband demodulation bandwidth, the ADL5380 is also an ideal solution for defense and avionics equipment. Providing 0.25dB fine step resolution AGC, with adjustable common mode and DC offset correction features for simplifying direct conversion receivers and easing subsequent driving of the final analog-to-digital converter (ADC), the AD8366 is optimized for signal gain control and accuracy.
The AD8366 is the industry’s first dual-channel digitally controlled gain trim amplifier with 0.25 dB step over 4.5 to 20.5dB gain range. Driving, maintaining excellent quadrature accuracy for direct conversion radio receivers, the AD8366 is ideally suited for analog I/Q quadrature ADC. The fine gain control allows flexible and precise tuning of gain-critical to multi-standard and wideband radio receivers. For matching to ADC input ranges, and DC output offset correction loops to minimize demodulator DC offsets, additionally the AD8366 features include adjustable output common mode. The AD8366 is fully specified for direct conversion receiver designs capable of handling the widest of signal bandwidths with the lowest distortion. For example, the AD8366 supports the second and third harmonic distortion >88 dBc for 10 MHz signals at max gain.
