I'm developing a microprocessor monitored and controlled RFPA that outputs +30dBm to +61dBm CW between 10MHz to 15MHz. To accomplish this, I need to be able to measure RMS power with at least 40dBm of dynamic range; preferably 50dBm.
There are a number of excellent RMS power detectors available that meet my requirements, like the AD8364, except that they all have a linear-in-dB response. This logarithmic response causes compression of the measurement at high power levels when sampling with an ADC.
The response I need is linear-in-Watts or linear-in-volts to avoid the compression. I know I can use the microprocessor to do the conversion, but that does not eliminate the loss of resolution.
Any ideas for how I can convert the output of a linear-in-dB detector to linear-in-Watts or linear-in-volts before the ADC?
Thanks for your time!