MODULE FOR MEASURING THE IMPEDANCE OF A RESONANT IMMUNOSENSOR

摘要

The invention relates to a module for measuring the impedance of a resonant immunosensor (functionalized quartz crystal used in biological medium) with logarithmic response and a single detection channel, used in specific applications for a quartz crystal microbalance related to a network analyser. According to the invention, the module uses a quartz crystal named resonant immunosensor () passively interrogated with a signal from a DDS generator () by means of an attenuator () and a voltage probe (), and a current probe (), respectively, followed by an analogue divider circuit () at whose output there is a logarithmic detector () and a shaper () of signal as a voltage () proportional to the immunosensor impedance.