Signal preamplifier LNA 10

The LNA 10 oscilloscope preamp will significantly improve the small-signal performance of oscilloscopes at frequencies below 1MHz. Product Description: With this preamp, sub-microvolt signals can be displayed on scopes which typically only go down to 1mV/div on the vertical axis. The preamp includes an analog true differential input and an analog low-pass filter (tunable 1Hz-1MHz). Input-referenced RMS noise spectrum for f >100Hz is 4 nV/√Hz or less, so for example, even with 1000 x gain, total noise from 100 Hz to 1000 Hz is less than 1 div peak-to-peak on a 1mV/div vertical scope setting (assuming a low-impedance input). Most oscilloscopes are designed to display high-frequency (fast) events that may intrinsically have noise of a millivolt or more. However, low-frequency signals have much less intrinsic noise, so a low-noise preamp and a bandwidth-limiting filter are essential for small signals at low frequency.* Most amplifiers have a white noise spectrum (a flat spectral curve) at all frequencies above ~1000 Hz. This white noise spectrum is usually specified as a certain number of nV per √Hz. However, unlike typical passive resistors, the equivalent input noise spectrum of solid-state amplifiers (in nV/√Hz) becomes higher at low frequencies. Typically the number of nV/√Hz is proportional to ~1/f for f ≤10Hz. The table below shows actual noise of the LNA 10 in various frequency ranges. At all frequencies, the LNA 10 has much less noise than typical solid-state amplifiers.