CSE 120 Lecture Notes - Lecture 10: Electrical Impedance, Buffer Amplifier, Truth Table
9 May 2018
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CSE 120 Lecture Ten Notes - Tri State & Open Collector Buffers
Buffer
● Also known as buffer amplifier
● Provides electrical impedance from one circuit to another
● Signal is buffered from load currents
Figure Pulled From:
https://electronics.stackexchange.com/questions/236666/what-is-the-purpose-of-a-buffer-gate
Tri State Buffer
● Similar to buffer
● Adds additional “enable” input that controls primary input passed to output or not
● If “enable” inputs true
○ Tri State Buffer behaves like a normal buffer
● If “enable” inputs false
○ Tri State Buffer passes a High Impedance (or Hi-Z) signal
■ Effectively disconnects output from signal
● Often connected to a bus
○ Allows for multiple signals to travel along the same connection
● Truth tables are also used for these buffers
● Truth Table Example:
