> especially if you don't care about the ohmic region (which you usually don't in logic ICs),
you have to care about the ohmic region to be confident you've safely steered clear of it; at least one fet moves through the ohmic region every time a mos gate's output transitions
rtl is the bipolar equivalent of nmos (see the analog simulation at http://tinyurl.com/ylnljbgz) but you do need base resistors if you're going to try to drive its inputs with voltage sources instead of the outputs of other rtl gates. but you can omit them when the inputs are connected to rtl outputs http://tinyurl.com/ywja8z28
the flip side of that is that, though you need a base resistor to provide a constant logic high to an rtl gate, you can provide a low just by leaving the input open, you don't even need a wire like you do for nmos
bipolar logic is also a lot harder for students to blow up if your lab power supply has a current limit on its output
you have to care about the ohmic region to be confident you've safely steered clear of it; at least one fet moves through the ohmic region every time a mos gate's output transitions
rtl is the bipolar equivalent of nmos (see the analog simulation at http://tinyurl.com/ylnljbgz) but you do need base resistors if you're going to try to drive its inputs with voltage sources instead of the outputs of other rtl gates. but you can omit them when the inputs are connected to rtl outputs http://tinyurl.com/ywja8z28
the flip side of that is that, though you need a base resistor to provide a constant logic high to an rtl gate, you can provide a low just by leaving the input open, you don't even need a wire like you do for nmos
bipolar logic is also a lot harder for students to blow up if your lab power supply has a current limit on its output