Importance

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Abstract

The Miller effect capacitance of an amplifying device, such as a transistor, is effectively used to increase the gain and/or the high-frequency cut-off point in the band width of a relatively high-frequency amplifier. The transistor or equivalent amplifying device is connected in an emitter follower configuration and the amplifier output signal is derived therefrom. An input signal to the amplifier is applied through an input transformer. The secondary winding of the input transformer is electrically connected to the base of the transistor. The emitter follower configuration of the transistor causes the Miller effect capacitance to be effective in a resonant circuit which includes the effective inductance of the secondary winding of the input transformer and the Miller effect capacitance. The overall amplifier gain is established primary by the ratio of the number of coil turns of the secondary winding to the number of coil turns of the primary winding of the input inductor multiplied by the 'Q' of the resonant circuit including the secondary winding and the Miller effect capacitance.

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First Claim