Current multiplier/divider circuit

Details Current multiplier/divider circuit Current multiplier/divider circuit

1997-08-21

1998-08-18

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

327538, G05F 304

Patent

active

057962430

ABSTRACT:
A current multiplier/divider circuit is provided, which is capable of any one of multiplication and division operations in a current mode without changing its configuration. This circuit includes a first set of m bipolar transistors and a second set of n bipolar transistors, where m.gtoreq.2) and n.gtoreq.2. A base of a (j-1)-th one of the transistors of the first set is connected to an emitter of the j-th transistor of the first set, where 2.ltoreq.j.ltoreq.m. A base of a (k-1)-th one of the transistors of the second set is connected to an emitter of the k-th transistor of the second set, where 2.ltoreq.k.ltoreq.n. A sum of V.sub.BE of the m transistors with respect to a specific electric potential, which is generated at a base of the m-th transistor in the first set, is equal to a sum of V.sub.BE of the n transistors, which is generated at a base of the n-th transistor in the second set. At least one of collector currents of the (m+n) transistors in the first and second sets is used as an input current, at least one of these collector currents are used as an output current, and he remaining collector currents are set as constant currents, respectively. The at least one output current includes the multiplication or division result of the at least one input.

REFERENCES:
patent: 4045694 (1977-08-01), Ahmed
patent: 4284945 (1981-08-01), Ahmed
patent: 5438296 (1995-08-01), Kimura
patent: 5444648 (1995-08-01), Kimura
patent: 5481224 (1996-01-01), Kimura
patent: 5617052 (1997-04-01), Kimura
patent: 5640121 (1997-06-01), Kimura

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