MCVA5 preamplifier

The 4 differential inputs offer an input impedance greater than 10 TΩ to GND and a very low input bias currents of less than 2 pA (typ.). They can be operated in either A-B (differential) or A (single-ended) mode or left floating. The circuit can be AC-coupled, and the integration of AC-coupling after the first amplification stage further reduces leakage currents at the input. The amplification circuit has user-selectable gains of 1, 10, 100 and 1000 and a bandwidth in excess of 500 kHz. Despite the very high input impedance spectral noise is as low as 4 nV/√Hz (SE, gain 100/1000)

The preamplifier is solely controlled through its remote interface, as there are no physical controls on the instrument. The preamplifier is supplied with either suitable cables for a Nanonis system or a plug&play USB adapter for standalone operation. In order to avoid any coupling between the remote interface and the signal circuits, the remote interface is optically isolated. As an additional measure, control signals are sent to the preamplifier only when a parameter (like gain, input coupling,…) needs to be altered. Multiple preamplifiers can be connected in series if more than 4 channels are required.

Power is provided from the AUX power supply of a Nanonis TSC/SC5 or TSO/SO5 through the supplied cable (if ordered with a Nanonis Tramea Quantum Transport Measurement System or a Nanonis Mimea SPM Control System). Alternatively a power supply for Femto® preamplifiers is also suitable to power the instrument.

The amplifier is protected against dust and moisture ensuring that the very high input impedance will be maintained over time as no substances like oil, water or dust can enter the enclosure. The sealed enclosure also permits the instrument to be located where condensation due to cryogenic liquids or gases might otherwise cause water penetration into the enclosure.