Circuit bias via transformer

Details Circuit bias via transformer Circuit bias via transformer

1996-05-20

1998-03-24

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330122, 336180, 336182, H03F 326, H01F 2728

Patent

active

057317402

ABSTRACT:
In an amplifier module circuit, an input transformer (TI) transforms an input signal (ISU) into a transformed input signal (ISB), which is supplied to a pair of amplifiers (AMPA, AMPB). In addition to windings (W1, W2) for input signal transformation, the core (CO) of the transformer (TI) is provided with an auxiliary winding (W3) for biasing the pair of amplifiers (AMPA, AMPB). A DC bias voltage (VB) is supplied to a tap (XT) on the auxiliary winding (W3) whose ends are DC coupled to the input transistors (QA, QB) of the pair of amplifiers (AMPA, AMPB).

REFERENCES:
patent: 1878742 (1932-09-01), Wheeler
patent: 2095294 (1937-10-01), Sola
"High Frequency Circuit Design" J.K. Hardy, Reston Publishing Company, 1979, pp. 181-186 & 316-318.

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