Two-channel logarithmic detector measures and controls RF signals over a wide frequency range

24 January 2007 Telecoms, Datacoms, Wireless, IoT

Optimised for wireless infrastructure, a new detector/controller IC eases RF design challenges by simultaneously measuring and monitoring two input signals with one package.

Analog Devices' ADL5519 is a dual detector/controller that precisely measures and controls the gain across the transmitter and receiver signal path within wireless infrastructure equipment. The ADL5519 integrates two matched detectors on a single chip, which offers considerable savings in board area and component cost as compared to conventional or discrete solutions.

The ADL5519 covers a wide frequency range of 1 MHz to 10 GHz, making the part suitable for all cellular and broadband wireless standards as well as proprietary systems that operate in extended frequency bands such as UNII 5,8 GHz.

The chip integrates two AD8317 log detectors to provide scaled, independent, logarithmic outputs of both RF input channels. It offers fast response time of 8/10 ns (fall/rise) and superior temperature stability of ±0,5 dB over a 50 dB dynamic range. It also provides a difference output that effectively measures the power gain or loss between the two inputs.

With the difference output, the ADL5519 can accurately control the gain across a transmitter or receiver signal chain as each of the two individual log detectors can be set to measure input signals at different frequencies. Within high power amplifiers, it can be used to monitor input and output power, or to measure forward and reverse output power, that is, the return loss voltage standing wave ratio (VSWR) of the load.

The 24-lead ADL5519 operates over 3-5 V, typically consuming 56 mA, and only 400 μA when disabled.

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