Design
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This article is a tutorial to design a BJT amplifier circuit. After studing how this was done it you will be able to design circuits for any gain.
Design BJT Amplifiers For Given Gain & Impedences
Basic BJT Amplifier Configurations
Common Base Configuration Here the base is the common terminal. Used frequently for RF applications, this stage has the following properties. Low input impedance, high output impedance, unity (or less) current gain and high voltage gain.
How to design an Amplifier using given Gain, Input Impedance and output Impedance.
Lets take this as an example to design a transistor amplifier which achieves these three basic requirements.HiFi
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Most published amplifier designs use a differential 'long-tailed-pair' input stage. This is partly because direct coupled outputs are used, so a low output offset voltage is needed, and the differential stage is used together with d.c. negative feedback to maintain a low offset.
Amplifier Design 1.
Tube Data
Transconductance The ability of a JFET to amplify is described as trans-conductance and is merely the change in drain current divided by the change in gate voltage. It is indicated as Mhos or Siemens and is typically 2.5mmhos to 7.5mmhos for the MPF102 transistor.