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2. Power amplifier classes - Wikipedia

   en.wikipedia.org/wiki/Power_amplifier_classes

   Power amplifier classes. Power amplifier circuits (output stages) are classified as A, B, AB and C for linear designs—and class D and E for switching designs. The classes are generally based on the proportion of each input cycle (conduction angle) during which an amplifying device passes current. [ 2]

3. Gain (electronics) - Wikipedia

   en.wikipedia.org/wiki/Gain_(electronics)

   An amplifier has an input impedance of 50 ohms and drives a load of 50 ohms. When its input ) is 1 volt, its output is 10 volts. What is its voltage and power gain? ...

4. Push–pull output - Wikipedia

   en.wikipedia.org/wiki/Push–pull_output

   A class-B push–pull amplifier is more efficient than a class-A power amplifier because each output device amplifies only half the output waveform and is cut off during the opposite half. It can be shown that the theoretical full power efficiency (AC power in load compared to DC power consumed) of a push–pull stage is approximately 78.5%.

5. Log amplifier - Wikipedia

   en.wikipedia.org/wiki/Log_amplifier

   Log amplifier. A log amplifier, also known as logarithmic amplifier or logarithm amplifier or log amp, is an amplifier for which the output voltage Vout is K times the natural log of the input voltage Vin. This can be expressed as, where Vref is the normalization constant in volts and K is the scale factor.

6. Instrumentation amplifier - Wikipedia

   en.wikipedia.org/wiki/Instrumentation_amplifier

   An instrumentation amplifier (sometimes shorthanded as in-amp or InAmp) is a type of differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment. Additional characteristics include ...

7. Programmable-gain amplifier - Wikipedia

   en.wikipedia.org/wiki/Programmable-gain_amplifier

   A programmable-gain amplifier ( PGA) is an electronic amplifier (typically based on an operational amplifier) whose gain can be controlled by external digital or analog signals. The gain can be set from less than 1 V/V to over 100 V/V. [ 1] Examples for the external digital signals can be SPI, I²C while the latest PGAs can also be programmed ...

8. Gain–bandwidth product - Wikipedia

   en.wikipedia.org/wiki/Gain–bandwidth_product

   Gain–bandwidth product. Adding negative feedback limits the amplification but improves frequency response of the amplifier. The gain–bandwidth product (designated as GBWP, GBW, GBP, or GB) for an amplifier is a figure of merit calculated by multiplying the amplifier's bandwidth and the gain at which the bandwidth is measured. [ 1]

9. Buffer amplifier - Wikipedia

   en.wikipedia.org/wiki/Buffer_amplifier

   Buffer amplifier. In electronics, a buffer amplifier is a unity gain amplifier that copies a signal from one circuit to another while transforming its electrical impedance to provide a more ideal source (with a lower output impedance for a voltage buffer or a higher output impedance for a current buffer ). This "buffers" the signal source in ...