![]() ![]() One example is the HEF4007 but it is limited in what you can do with it due to the way that the MOSFETs are connected. However these are rare and not easy to use.Īnother option is to use a MOSFET array, that's a chip with some MOSFETs on it. There are some MOSFETs for amplification of RF signals. The only way I can see this work using discrete MOSFETs is if you use MOSFETs that are not designed for switching but instead are designed to amplify signals. So that's why you get very large currents and the MOSFET will heat up because of that. In that way the voltage ( \$V_\$ of a few hundred ohms or even a couple of kilo ohms. So for example if Q2 = 100um/1um then Q1 = 750um/1um. So the W/L of Q2 needs to be 7.5 times larger than the W/L of Q1. In the books example the ratios of the geometries (W/L) is about: ![]() The crucial detail is that Q2 needs to have a larger W/L than Q1. ![]() You probably missed a small but crucial detail in this schematic. ![]()
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