AD605 Datasheet, Analog Devices

Two Independent Linear-in-dB Channels Input Noise at Maximum Gain: 1.8 nV/ √Hz , 2.7 pA/√Hz Bandwidth: 40 MHz (
  –3 dB) Differential Input Absolute Gain Ran.

Ultrasound and Sonar Time-Gain Control High Performance AGC Systems Signal Measurement Dual, Low Noise, Single-Supply V.