
RMS power detector for RF communications designs spans 10 GHz
ADI designed the ADL5906 for applications that require an accurate RMS measurement of signal power including communications infrastructure, power amplifier linearisation, point-to-point and point-to-multipoint, cable, military, satellite, instrumentation equipment and ISM band transmitters.
Requiring only a single supply of 5V and a few capacitors, the detector is easy-to-use and capable of being driven with a single-ended or differential input drive. It provides low temperature drift across a -55ºC to +125ºC that is highly repeatable from part-to-part, thereby reducing design risk and manufacturing costs.
The device is specified to deliver accurate RMS-to-dc conversion from 10 MHz to 10 GHz; has a single-ended ± 1dB detection range of 67 dB at 2140 MHz, with no balun or external input matching required; and it is tolerant of high peak/average ratio and varying crest factors with response-independent acceptance of waveform types such as GSM/CDMA/W-CDMA/TD-SCDMA/WiMAX/LTE. It will accept inputs from -65 dBm to +8 dBm.
The device yields a linear-in-decibels output (that is it has in-built linear to logarithmic conversion), scaled 55 mV/dB (1.1V per decade) at 2140 MHz; has temperature stability of < ±1 dB from -40°C to +85°C; powers-down to 250 µA; and is pin-compatible with the ADL5902 and AD8363 TruPwr detectors. It comes in a 4mm x 4mm 16-lead LFCSP package and costs $5.59 (1000).
More at www.analog.com/adl5906
