Analog Devices has a dual low-noise amplifier with selectable gain and active impedance matching.

The combination of selectable gain and low noise enables the amplifier to detect and resolve low-level input signals. Active impedance matching is designed to reduce signal reflection by matching signal-source and amplifier-input impedances.

By using the pin-strapping options, designers can select four gains: G = 4, 8, 12 and 16. At a gain of four, the amplifier’s bandwidth is 200MHz. Input noise referred is 0.85-nV/rtHz.

A single-ended-input amplifier, the AD8432 operates on a single 5V supply and provides a differential output optimised to drive ADI’s AD8333 and AD8339 I/Q demodulators and phase shifters in medical ultrasound CW Doppler applications as well as a wide range of ADCs (analog-to-digital converters), such as ADI’s  AD7679 18-bit, 570 kSPS PulSAR converter and AD7952 14-bit, 1 MSPS PulSAR converter.