Key Facts from Reading Chapter 1
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The following facts are not profound and are possibly very obvious. Nonetheless, they might help cement certain concepts. Please add things you think would be helpful.
Contents
Transistors
 Conduction in ntype material is from free electrons.
 Conduction in ptype material is from holes (positive particles).
 The function of metaloxidesemiconductor fieldeffect transistors (MOSFETs) depends on the voltage applied to the gate.
 Certain ranges of voltage allow no current to flow between the drain and the source. In this way, the MOSFET acts like an open switch.
 Another particular range of voltage allows current to easily flow from the source to the drain.
 When the voltage is in between the ranges of open and closed switch, the MOSFET can smoothly control the amount of current flowing.
 Bipolar Junction Transistors (BJTs) can act as either switches or current controls as well.
Amplifiers
 An inverting amplifier has a negative voltage gain, .
 A noninverting amplifier has a positive voltage gain, . (If you get this, you deserve a cookie)
 The power gain,, is the ration of the output power to the input power

 is the amplifier's input resistance and is the amplifier's output resistance.

Decibel Conversion
 Power gain, , can be converted to decibels:
 By the equation above, we can say voltage gain in decibels can be found with this equation: , where is the voltage gain and is the voltage gain is decibels.
 Similarly, we can say current gain in decibels can be found with this equation: , where is the current gain and is the current gain in decibels.
Differential Amplifiers
 Differential Amplifiers have two inputs. The terminal marked with a "+" is the noninverting input, and the terminal marked with a "" is the inverting input.
 The differential input signal is given by
 The output of an ideal differential amplifier is given by .
 The commonmode input signal is given by the following: .
 A real differential amplifier's output is given by , where is the commonmode signal gain.
References
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 The sentence that says "voltage gain and is the voltage gain is decibels." I think you mean "in decibels." Other than that nice work!