실험, 05 - 연산증폭기, 이론

궤환증폭기 입출력 임피던스

Output impedance 구할 때: 입력단 전압원 단락, 전류원 개방

Input impedance 구할때: 출력단 전압원 개방, 전류원 단락

1. 연산증폭기 (OP amp; operational amplifier)

1) Ideal Op Amp

Infinite voltage gain

Infinite input resistance

Zero output resistance

Infinite bandwidth

Zero noise

Zero power supply rejection ratio (PSSR = 0)

Infinite common mode rejection ratio (CMRR = ∞

2) 반전/비반전 증폭기

3) Summing Amplifier

2. Op Amp Applications

1) Op amp with no feedback

- Voltage comparator

- Voltage level detector

- Zero voltage level detector

2) Op amp with postitive feedback

- Schmitt trigger

- Oscilators

- Active filters

3) Op amp with negative feedback

4) Op amp applications

- Signal amplifiers: summing amp (audio mixer), instrumentation amp, audio preamp, AGC amp

- Power amplifiers: audio

- Voltage comparators

- Ammeter

- Synthetic circuit elements: inductance gyrators, negative impedance converer (NIC), capacitance

multipliers

- Charge amplifiers, current pump

- Bilateral current source

- Voltage-to-current, current-to-voltage converters

- Non-linear amplifiers: log amp, antilog amp, exponential amp

- Audio/video preamplifiers

- Buffers and isoation amplifiers, impedance transformers

- Differential amplifiers

- Differentiators and integrators

- Filters

- Precision rectifiers

- Precision peak detectors

- Voltage and current references

- Regulators: voltage and current regulators

- Analog calculators

- ADC

- DAC

- Voltage clamping

- Oscillators and waveform generators

- Clippers

- Clampers

2. Advanced Op Amp Circuits

1) Matched Dual Precision Operational Amplifier

- Linear Technology: LT1002

2) Two Op Amp Instrumentation Amplifier

- Analog Devices: MT-062