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Operational Amplifier - Coggle Diagram
Operational Amplifier
Parts
Noninverting Input
+
Inverting Input
-
Output
Method
Single-ended input
Input signal on one input
Input signal applied @
Inverting input
Input signal is inverted
Noninverting input
Output signal inverted
Ground on other input
Double-ended input
Applied signal at each input
Difference signal
Input signal 1 - Input signal 2
Double-ended output
Two outputs
Difference of two output signal
Floating signal
One input signal
One same polarity output
One opposite polarity output
Connection
Differential Amplifier Circuit
Extremely popular
Input signal combinations
Single-ended
One input signal applied
Double-ended
Two opposite-polarity input signals applied
Common-mode
Same input signal on both inputs
Types
AC Operation of Circuit
Single-ended AC Voltage Gain
Double-Ended AC Voltage Gain
Common-Mode Operation of Circuit
Constant-Current Source
DC Bias
Basic connection
if input applied is
-
Different polarity output signal
+
Same polarity output signal
Gain
Unity Gain
Rf=R1
Constant-Magnitude Gain
Virtual Ground
Input voltage signal
small
Practical
Inverting Amplifier
Widely used constant gain amplifier circuit
Output is inverted
Non-inverting amplifier
Unity Follower
No polarity or phase reversal
Gain unity is 1
Like emitter/source follower circuit but gain is exactly unity
Summing amplifier
most used op amp circuit
Characteristics
Very high gain
Very high input impedance
Low output impedance
Specifications
Input voltage specifies by manufacturer
Output voltage specifies by the user with use of
Gain
Input voltage specification
DC Offset Parameters
Input Offset Voltage
V10 input voltage is manufacturer specification
Output Offset Voltage due to Input Offset
Different resistances
Different input currents
Total Offset due to Vio and Iio
Input Bias Current
Operation
Common-mode operation
Same input signal on both inputs
Cancellation
Small output signal or 0v
Common-mode rejection
Same polarity inputs signal at both inputs
Highly amplified
Different polarity inputs signal at both inputs
Slightly amplified
Rejecting/Cancellation
Lessen unwanted input signals
