Voltage-to-current converting circuit

Details Voltage-to-current converting circuit Voltage-to-current converting circuit

1982-07-07

1984-04-10

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

330257, G05F 320

Patent

active

044424000

ABSTRACT:
A voltage-to-current converting circuit which comprises a differential pair of first and second input transistors having their emitters connected through a conversion resistor. To reduce the conversion error depending upon the amplitude of an input voltage applied to the bases of the first and second transistors, the voltage-to-current converting circuit is provided with first and second constant current sources respectively connected between the collector of the first transistor and a first power supply terminal and between the collector of the second transistor and the first power supply terminal, third and fourth transistors whose collector-emitter paths are respectively connected between the emitter of the first transistor and a second power supply terminal and between the emitter of the second transistor and the second power supply terminal, and first and second base current supply circuits respectively connected between the base of the third transistor and the first power supply terminal and between the base of the fourth transistor and the first power supply terminal. In order to take out an output current, an output circuit is provided which has an output transistor having its collector-emitter path connected in series with a third constant current source between the first and second power supply terminals and its base connected to the base of the fourth transistor.

REFERENCES:
patent: 3434069 (1969-03-01), Jones
patent: 3909628 (1975-09-01), Muto
patent: 4004247 (1977-01-01), Van de Plassche
patent: 4288707 (1981-09-01), Katakura
LePage et al., "Voltage-to-Current Converter", IBM Technical Disclosure Bulletin, vol. 19, No. 4, Sep. 1976, pp. 1375-1376.
Ramaje, "Voltage-to-Current Converter", IBM Technical Disclosure Bulletin, vol. 23, No. 4, Sep. 1980, pp. 1668.
Amantea, "Voltage-to-Current Converter", RCA Technical Notes, TN No. 1242, May 28, 1980, pp. 1-3.

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