Broadband quadrature modulator integrates automatic gain control
Norwood, MA – A high-performance broadband I/Q quadrature modulator integrates automatic gain control (AGC) circuitry within a compact 6-mm × 6-mm LFCSP (lead-frame chip-scale package). Analog Devices Inc. (ADI) ADL5386 RF (radio frequency) transmitters in broadband wireless access systems, microwave radio links, cable modem termination systems, and cellular infrastructure equipment, company says.
|Analog Devices Inc. (ADI) ADL5386 supports high-data-rate modulation for next-generation communication infrastructure equipment.|
Operating across a 50-MHz to 2200-MHz frequency range, ADL5386 supports high-data-rate modulation for next-generation communication infrastructure equipment. It integrates a 25-dB dynamic range output power detector and a VVA (voltage variable attenuator) to form a closed-loop automatic level control (ALC) or AGC, enabling ADL5386 to set output power to user-determined levels and provides a subsystem within a small footprint to save board space, component cost, and circuit complexity in discrete implementations, company says.
The modulator features high output power capability (+10 dBm P1dB), high single-ended output linearity (+24 dBm IP3), and low noise floor (–160 dBm/Hz), providing excellent output dynamic range, company says. The –38 dBm carrier feedthrough and –46 dBc sideband suppression at 350 MHz minimizes calibration and nulling in high-order modulation applications.
Wideband inputs (dc to 700 MHz) are compatible with output levels of the company’s AD977x family of TxDAC+ (transmit digital-to-analog converter) devices. The–7 dBm local oscillator (LO) drive requirement is compatible with ADI’s ADF4360 series of integrated PLL (phase locked loop) synthesizers. The 2 × LO input frequency of ADL5386 helps minimize LO pulling in applications where LO isolation and board density are key, company says.
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