RF envelope and TruPwr RMS detector presents proportional output voltage
27-02-2015 |
Digikey
|
Semiconductors
The Analog Devices ADL5511 RF envelope and TruPwr RMS detector is now
available from Digi-Key. The device's envelope output voltage is presented
as a voltage that is proportional to the envelope of the input signal.
The RMS output voltage is independent of the peak-to-average ratio of the
input signal. The RMS output is a linear-in-V/V voltage with a conversion
gain of 1.9V/Vrms at 900MHz. The envelope output has a conversion gain of
1.46V/V at 900MHz and is referenced to an internal 1.1V reference voltage,
which is available on the EREF pin. The ADL5511 can operate from DC to 6GHz
on signals with envelope bandwidths up to 130MHz.
The extracted envelope can be used for RF power amplifier (PA) linearization
and efficiency enhancements and the RMS output can be used for RMS power
measurement. The high RMS accuracy and fast envelope response are
particularly useful for envelope detection and power measurement of
broadband, high peak-to-average signals that are used in CDMA2000, W-CDMA,
and LTE systems, says the company.