Hi everybody,
My project includes the designing a multi-channel current stimulator that will be used to deliver bipolar square pulses of 60V and 10 mA. In order to isolate this stimulator from the other devices in my project, I'm looking for ways to gate high-voltage low-amperage currents. It seems that MOSFET-based switches are quite nicely capable of doing this. Unfortunately all MOSFET-based relays have a switching on and off times on the order of 1 ms. This is not fast enough for my project. I noticed that MOSFETs themselves have on- and off-switching times of several micro- or even nanoseconds. So it seems that the slow operation of the MOSFET relays caused by the optical isolation mechanism which all relays of this type have. So I wonder, why there are no MOSFET relays without optical coupling, and will a pair of MOSFETs connected drain-to-drain do the job?
My project includes the designing a multi-channel current stimulator that will be used to deliver bipolar square pulses of 60V and 10 mA. In order to isolate this stimulator from the other devices in my project, I'm looking for ways to gate high-voltage low-amperage currents. It seems that MOSFET-based switches are quite nicely capable of doing this. Unfortunately all MOSFET-based relays have a switching on and off times on the order of 1 ms. This is not fast enough for my project. I noticed that MOSFETs themselves have on- and off-switching times of several micro- or even nanoseconds. So it seems that the slow operation of the MOSFET relays caused by the optical isolation mechanism which all relays of this type have. So I wonder, why there are no MOSFET relays without optical coupling, and will a pair of MOSFETs connected drain-to-drain do the job?