Two-stage transformer coupled intermediate frequency amplifier circuit

Two-stage transformer coupled intermediate frequency amplifier circuit

Transformer coupled multi-stage amplifier circuit. The circle shows the two-stage transformer coupled intermediate frequency amplifier circuit . Level 1 and level 2
are connected to each other via a transformer.
    Transformer coupling has two advantages: first, because the transformer can only couple AC signals (that is, it can only change AC but not DC), so the static operating points of
the front and rear stages are also independent of each other; second, the transformer has an impedance conversion function. Use transformer coupling. The best impedance matching can be obtained between the front and rear stages
so that the preamplifier can output maximum power to the subsequent stage amplifier.
    Disadvantages of the transformer coupling method: First, it cannot amplify signals with very low frequencies; second, the size and mass of the transformer are large and are not suitable for
miniaturization and integration.
    Transformer coupling can be widely used in circuits such as low-frequency power amplifiers, intermediate-frequency amplifiers, and high-frequency amplifiers.