Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1981-04-20
1984-03-06
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330149, 330252, H03F 345, H03F 126
Patent
active
044356854
ABSTRACT:
An amplifier comprising at least one emitter-coupled transistor pair with a signal source connected in the emitter line. Amplifier non-linearities mainly caused by the second harmonic are compensated by supplying the base of at least one of the transistors with a compensation signal of suitable phase that is derived from either the input or the output signal of the amplifier. This results in a multiplication process which produces a second harmonic in the collector current of the two transistors which, with the correct phase of the compensation signal at the input, exactly compensates the second harmonic caused by the amplifier non-linearity. If the transistor pair is used for gain or volume control, the direct voltage between the bases of the two transistors, and the compensation signal, will both be varied.
REFERENCES:
patent: 3825854 (1974-07-01), Pichal
Eckert Wolfgang
Holtkamp Bernd
Kilian Ernst A.
Franzblau Bernard
Mayer Robert T.
Mullins James B.
U.S. Philips Corporation
Wan Gene
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