3. BIPOLAR JUNCTION TRANSISTORS (BJT)
Travis Kleeburg E17
Chapter 3
BJT: Our First 3 Terminal Device!
 Active device with dc sources
 Allows for input/output, gain/amplification, etc
BJT Equivalent Circuit
Looks like a current amplifier
with gain b
Digital Inverter With BJTs
Output high
Input low
Output low
Input high
In Out
0 1
1 0
In Out
BJT Rules:
Vout cannot exceed Vcc=5V
Vin cannot be negative