The LT5581 broadband rms detector features a dynamic range of 40 dB, a supply current of 1.4 mA at 3.3 V, and a frequency range from 10 MHz to 6 GHz. It outputs a dc voltage that is linearly ...
Figure 1 is based on the OP37 which has an impressive list of specs. They include a 60 MHz gain-bandwidth, making 20 kHz bandwidth compatible with gain up to 3000x = +70 dB, noise ~3 nV/Hz 1/2 which ...