Voltage to current converting circuit

Details Voltage to current converting circuit Voltage to current converting circuit

1984-05-25

1985-12-24

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

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

323316, 330288, G05F 308

Patent

active

045609209

ABSTRACT:
A voltage to current converting circuit can operate at low voltages and throughout a high range of voltages without distortion of the output signal current. An input-output current mirror circuit has a current input transistor and a current output transistor having their bases connected. The collector of the current input transistor is connected to an input resistor which accepts the input signal voltage. The collector of the current input transistor is also connected to the bases of the current input and output transistors through a non-inverting current amplifier having a low input impedance. The collector of the current input transistor is further connected to a source of a constant DC reference current I having a high output impedance. The input signal voltage e is converted to a current signal by the input resistor and applied to the collector of the current input transistor. The resulting current I-i which appears at the collector of the current output transistor is used by an output circuit to develop a first output signal of I-i. The output circuit also generates an intermediate current of 2I and provides a second output signal of I+i obtained by subtracting I-i from the intermediate current 2I.

REFERENCES:
patent: 4338527 (1982-07-01), Nagano
patent: 4354122 (1982-10-01), Embree et al.
Ashok et al., "Non-Inverting Op-Amp Circuits Using Current Mirrors," Electronic Eng., Sep. 1978, p. 19.
Vojnovic, "Accurate Voltage-Controlled Constant-Current Source," New Electron. (G.B.), vol. 11, No. 4, p. 23, Feb. 21, 1978.
RCA Technical Note No. 1242, Robert Amantea, "Voltage-to-Current Converter," 3 Sheets, May 28, 1980.

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