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2. Differential amplifier - Wikipedia

   en.wikipedia.org/wiki/Differential_amplifier

   An operational amplifier, or op-amp, is a differential amplifier with very high differential-mode gain, very high input impedance, and low output impedance. An op-amp differential amplifier can be built with predictable and stable gain by applying negative feedback (Figure 5). [nb 5] Some kinds of differential amplifier usually include several ...

3. Instrumentation amplifier - Wikipedia

   en.wikipedia.org/wiki/Instrumentation_amplifier

   Feedback-free instrumentation amplifier is the high-input-impedance differential amplifier designed without the external feedback network. This allows reduction in the number of amplifiers (one instead of three), reduced noise (no thermal noise is brought on by the feedback resistors) and increased bandwidth (no frequency compensation is needed).

4. Fully differential amplifier - Wikipedia

   en.wikipedia.org/wiki/Fully_differential_amplifier

   A fully differential amplifier (FDA) is a DC-coupled high-gain electronic voltage amplifier with differential inputs and differential outputs. In its ordinary usage, the output of the FDA is controlled by two feedback paths which, because of the amplifier's high gain, almost completely determine the output voltage for any given input.

5. Operational amplifier - Wikipedia

   en.wikipedia.org/wiki/Operational_amplifier

   The input impedance is relatively high because of the small current through Q1-Q4. A typical 741 op amp has a differential input impedance of about 2 MΩ. [16] The common mode input impedance is even higher, as the input stage works at an essentially constant current.

6. Operational transconductance amplifier - Wikipedia

   en.wikipedia.org/wiki/Operational_trans...

   Like a standard operational amplifier, the OTA also has a high impedance differential input stage and may be used with negative feedback. [3] But the OTA differs in that: The OTA outputs a current while a standard operational amplifier outputs a voltage. The OTA is usually used "open-loop"; without negative feedback in linear applications.

7. Operational amplifier applications - Wikipedia

   en.wikipedia.org/wiki/Operational_amplifier...

   where Z dif is the op-amp's input impedance to differential signals, and A OL is the open-loop voltage gain of the op-amp (which varies with frequency), and B is the feedback factor (the fraction of the output signal that returns to the input). [3] [4] In the case of the ideal op-amp, with A OL infinite and Z dif infinite, the input impedance ...