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Common-emitter amplifiers give the amplifier an inverted output and can have a very high gain that may vary widely from one transistor to the next. The gain is a strong function of both temperature and bias current, and so the actual gain is somewhat unpredictable.
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current). It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude (magnitude of the voltage or current) of a signal applied to its input ...
High-voltage audio amplifiers have almost become a one chip solution. For example, National Semiconductor 's LME49810 [ 7 ] (and similar products LME49811 [ 8 ] and LME49830 [ 9 ] ) can output 100 V peak to peak signals, but have relatively low current output, so a standard circuit includes a Darlington or FET discrete output stage.
An operational amplifier (often op amp or opamp) is a DC-coupled electronic voltage amplifier with a differential input, a (usually) single-ended output, [1] and an extremely high gain. Its name comes from its original use of performing mathematical operations in analog computers .
The common collector amplifier's low output impedance allows a source with a large output impedance to drive a small load impedance without changing its voltage. Thus this circuit finds applications as a voltage buffer. In other words, the circuit has current gain (which depends largely on the h FE of the transistor) instead of voltage gain. A ...
The load can thus draw high current without affecting the amplifier performance. A cascode connection (common emitter stage followed by common base stage) is sometimes found. Audio power amplifiers will typically have a push-pull output as the final stage. A Darlington pair of transistors is another way of obtaining a high current gain. In this ...
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