Supply current compensation circuitry

Details Supply current compensation circuitry Supply current compensation circuitry

1990-04-03

1991-07-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 330297, H03F 345

Patent

active

050309226

ABSTRACT:
In apparatus including a number of functional elements coupled to a common supply bus, certain of the elements may draw time varying supply current related to signal being processed. Supply current compensation circuitry responsive to signal processed by such elements is included to draw equal and opposite time varying supply current to maintain the total supply current constant and thereby to limit localized supply potentials variation. Exemplary compensation circuitry for an amplifier includes a transistor coupled between the supply busses and controlled by signal potential from the amplifier to draw supply current proportional to the signal applied to the amplifier, which supply current is opposite in phase to supply current drawn by the amplifier.

REFERENCES:
patent: 3868537 (1975-02-01), Haferl
patent: 3868582 (1975-02-01), Haferl
patent: 3904973 (1975-09-01), Haferl
patent: 4217555 (1980-08-01), Iwamatsu
patent: 4327332 (1982-04-01), Malchow
National Semiconductor Data Sheet LM136/LM236/LM336, 2.5V Reference Diode, 1978 National Semiconductor Linear Databook, pp. 2-16 to 2-21.

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