Variable current source for variably controlling an output curre

Details Variable current source for variably controlling an output curre Variable current source for variably controlling an output curre

1994-09-27

1996-01-09

Nguyen, Matthew V.

Electricity: power supply or regulation systems

Self-regulating

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

323315, 327538, G05F 304, G05F 316, H03K 301

Patent

active

054831512

ABSTRACT:
In addition to a Gilbert amplifier 101 which includes transistors 1 to 4, a current mirror circuit 102 is disposed. The internal structure of a current supply block 103 is modified. The current supply block 103 linearly converts an externally supplied control voltage Vcont by linear voltage/current conversion and determines a collector current (of a current amount IB) of a transistor 47. The same amount (=IB) of current as this collector current is developed as a collector current of a transistor 42 of the current mirror circuit 102. A collector of the transistor 42 is connected to a current source 45 of the current supply block 103 and an emitter of the transistor 3. Hence, assuming that a current value of the current source 45 is Io, an emitter current IA flowing through the transistor 3 is determined as IA=Io-IB. As a result, an output current I1 of the transistor 1 which has its base connected to the emitter of the transistor 3 changes in proportion to the control voltage Vcont.

REFERENCES:
patent: 4885475 (1989-12-01), Farina
patent: 5196742 (1993-03-01), McDonald
patent: 5252866 (1993-10-01), Kimura
patent: 5343163 (1994-08-01), Linder et al.
patent: 5373253 (1994-12-01), Bailey et al.
patent: 5381083 (1995-01-01), Inamori et al.
patent: 5391981 (1995-02-01), Masson
Bipolar and MOS Analog Integrated Circuit Design, Alan B. Grebene, pp. 437-443, 8.11. "Current Amplifiers: The Gilbert Gain Cell", New York, 1984.

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