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2. Amplifier - Wikipedia

   en.wikipedia.org/wiki/Amplifier

   An operational amplifier is an amplifier circuit which typically has very high open loop gain and differential inputs. Op amps have become very widely used as standardized "gain blocks" in circuits due to their versatility; their gain, bandwidth and other characteristics can be controlled by feedback through an external circuit. Though the term ...

3. Williamson amplifier - Wikipedia

   en.wikipedia.org/wiki/Williamson_amplifier

   The Williamson amplifier is a four-stage, ... V2A and V2B) and fourth (output, V3 and V4) stages follow Cocking's Quality Amplifier circuit. The added first stage ...

4. Charge amplifier - Wikipedia

   en.wikipedia.org/wiki/Charge_amplifier

   Schematic of a charge amplifier with a piezoelectric sensor. The amplifier offsets the input current using a feedback reference capacitor, and produces an output voltage inversely proportional to the value of the reference capacitor but proportional to the total input charge flowing during the specified time period.

5. Operational amplifier - Wikipedia

   en.wikipedia.org/wiki/Operational_amplifier

   In this context, high input impedance at the input terminals and low output impedance at the output terminal(s) are particularly useful features of an op amp. The response of the op-amp circuit with its input, output, and feedback circuits to an input is characterized mathematically by a transfer function; designing an op-amp circuit to have a ...

6. Power amplifier classes - Wikipedia

   en.wikipedia.org/wiki/Power_amplifier_classes

   This is due to the circuit ability to keep the rail transistors (T2 and T4) in cutoff until a music voltage peak is of a sufficient magnitude to require the additional voltage from the + and - 80 V supplies. Refer to the schematic figure. The class H amplifier can actually be thought of as two amplifiers in series.

7. Current-feedback operational amplifier - Wikipedia

   en.wikipedia.org/wiki/Current-feedback...

   Representative schematic of a current-feedback op-amp or amplifier. The current-feedback operational amplifier (CFOA or CFA) is a type of electronic amplifier whose inverting input is sensitive to current, rather than to voltage as in a conventional voltage-feedback operational amplifier (VFA).

8. Differential amplifier - Wikipedia

   en.wikipedia.org/wiki/Differential_amplifier

   A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs. [1] It is an analog circuit with two inputs and + and one output , in which the output is ideally proportional to the difference between the two voltages:

9. Bridged and paralleled amplifiers - Wikipedia

   en.wikipedia.org/wiki/Bridged_and_paralleled...

   Representative schematic of a paralleled amplifier configuration. A paralleled amplifier configuration uses multiple amplifiers in parallel, i.e., two or more amplifiers operating in-phase into a common load. In this mode the available output current is doubled but the output voltage remains the same. The output impedance of the pair is now halved.