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2. Input impedance - Wikipedia

   en.wikipedia.org/wiki/Input_impedance

   The losses due to input impedance (loss) in these circuits will be minimized, and the voltage at the input of the amplifier will be close to voltage as if the amplifier circuit was not connected. When a device whose input impedance could cause significant degradation of the signal is used, often a device with a high input impedance and a low ...

3. Instrumentation amplifier - Wikipedia

   en.wikipedia.org/wiki/Instrumentation_amplifier

   Typical instrumentation amplifier schematic. 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.

4. Common base - Wikipedia

   en.wikipedia.org/wiki/Common_base

   The amplifier input impedance R in looking into the emitter node is very low, given approximately by = =, where V T is the thermal voltage, and I E is the DC emitter current. For example, for V T = 26 mV and I E = 10 mA, rather typical values, R in = 2.6 Ω.

5. Transimpedance amplifier - Wikipedia

   en.wikipedia.org/wiki/Transimpedance_amplifier

   Transimpedance amplifier with a reverse-biased photodiode. In the circuit shown in figure 1 the photodiode (shown as a current source) is connected between ground and the inverting input of the op-amp. The other input of the op-amp is also connected to ground. This provides a low-impedance load for the photodiode, which keeps the photodiode ...

6. Common emitter - Wikipedia

   en.wikipedia.org/wiki/Common_emitter

   The output of a common emitter amplifier is inverted; i.e. for a sine wave input signal, the output signal is 180 degrees out of phase with respect to the input. [ 1 ] In this circuit, the base terminal of the transistor serves as the input, the collector is the output, and the emitter is common to both (for example, it may be tied to ground ...

7. Cascode - Wikipedia

   en.wikipedia.org/wiki/Cascode

   In high frequency circuits, impedance matching at the input and output of the amplifier is typically desired in order to eliminate signal reflections and maximize power gain. In the cascode, the isolation between the input and output ports is still characterized by a small reverse transmission term g 12 , making it easier to design matching ...