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Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐1 Eung Je Woo
Operational Amplifier
Amplifiers
Voltage amplifier
Voltage source and source impedance
Amplifier’s input impedance, open-circuit voltage gain and output
impedance
Load, load impedance, output voltage, output current and output power
Loading effects and overall voltage gain
Current amplifier
Trans-resistance amplifier
Trans-conductance amplifier
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐2 Eung Je Woo
Operational amplifier (Op amp)
Structure, symbol and power supply
Differential amplifier
Non-inverting input and inverting input
Input impedance
Open-loop gain
Output impedance
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐3 Eung Je Woo
Linear Op amp circuits with negative feedback
v v
0i i
Inverting amplifier
Voltage gain
Input impedance and loading effect
Output impedance
Non-inverting amplifier
Voltage gain
Input impedance and loading effect
Output impedance
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐4 Eung Je Woo
Unity-gain buffer or voltage follower
Voltage gain
Input impedance and loading effect
Output impedance
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐5 Eung Je Woo
Adder or summing amplifier
Voltage gain
Input impedance and loading effect
Output impedance
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐6 Eung Je Woo
Subtractor or differential amplifier
Differential-mode signal and common-mode signal
Differential-mode gain and common-mode gain
CMRR
Input impedance and loading effect
Output impedance
Instrumentation amplifier
Differential-mode gain and common-mode gain
CMRR
Input impedance and loading effect
Output impedance
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐7 Eung Je Woo
Level shifter
Active filter
Low-pass filter
High-pass filter
Band-pass filter
Band-stop filter (notch filter)
All-pass filter (phase shifter)
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐8 Eung Je Woo
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐9 Eung Je Woo
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐10 Eung Je Woo
Integrator and differentiator
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐11 Eung Je Woo
Charge amplifier
Practical Op amp
Input impedance
Output impedance
DC offset
Saturation
Open-loop gain
Unity-gain frequency (or gain-bandwidth product)
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐12 Eung Je Woo
Bandwidth
Slew rate
Short-circuit output current
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐13 Eung Je Woo
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐14 Eung Je Woo
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐15 Eung Je Woo
Dept. of Biomed. Eng. BME207: Basic Electronic Circuits Kyung Hee Univ.
http://www.ejwoo.com 8‐16 Eung Je Woo