The U7227A preamplifier with USB interface is ideally suited as a preamplifier for the spectrum / signal analyzers of the N9000X series. This preamplifier offers a gain of approx. 17 dB with a very low level of self-noise. The preamplifier receives the supply voltage via the USB interface, which also serves to transmit its own S parameters to the spectrum / signal analyzer, which are stored in an EEPROM in the preamplifier. The preamplifier can significantly improve the sensitivity of the analyzers. The preamplifier's own noise component in the frequency range is 10 MHz to 4 GHz <5.5 dB