The U7227C preamplifier with USB interface is ideally suited as a preamplifier for the spectrum / signal analyzers of the N9000 X 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 self-noise component of the preamplifier is in the frequency range 100 MHz to 26.5 GHz <5.5 dB.