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Voltage-to-current-conversion-circuit-for-converting-voltage-to-multiple-current-outputs

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Details

Inventors: Nishimura, Kouichi;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Wong; Peter S.
Assistant Examiner: Han; Y. J.
Attorney, Agent or Firm: Whitham, Curtis & Whitham

This invention provides an absolute value voltage to current conversion circuit which realizes multiple outputs of the current obtained by the conversion of a voltage. For an input voltage of positive polarity, an inverting voltage to current conversion circuit is formed by means of an operational amplifier and a multiple output current mirror circuit. In that case, currents which are 1/n of a converted current are obtained by setting the ratio of the input current to the output current of the current mirror circuit to n:1. For an input voltage of negative polarity, a noninverting voltage to current conversion circuit is formed by means of the operational amplifier and a plurality, n, of bipolar transistors. The converted current is distributed among n bipolar transistors to obtain an output current per transistor which is 1/n of the converted current. As a result, an absolute value voltage to current conversion circuit with multiple outputs can be realized.

DETAILED DESCRIPTION It is an object of the present invention to provide a voltage to current conversion circuit which converts the absolute value of an input voltage to a current and enables to obtain a plurality of current outputs.
It is another object of this invention to provide a voltage to current conversion circuit which generates a plurality of currents with a simple configuration of the circuit.
The absolute value voltage to current conversion circuit according to one mode of this invention includes a resistor with its one end connected to an input voltage terminal (or reference voltage terminal), an operational amplifier with its inverting input connected to the other end of the resistor and the input terminal of a multiple output current mirror circuit, its noninverting input connected to the reference voltage terminal (or the input voltage terminal), and its output connected to a common terminal of the multiple output current mirror circuit, and a plurality, n, of bipolar transistors with their respective gates connected in common to the output of the operational amplifier, and their respective emitters connected in common to the inverting input of the operational amplifier.
The absolute value voltage to current conversion circuit according to another mode of this invention includes a second and a fourth resistors with every one end of them connected to corresponding differential input voltage terminal, a third and a fifth resistors with every one end of them connected to the other end of each of the second and fourth resistor, and the other end of them connected in common to a reference voltage terminal, an operational amplifier with its inverting input connected to the junction of the second and the third resistors, and the input terminal of a multiple output current mirror circuit having the input current to output current ratio of n:1, its noninverting input connected to the junction of the fourth and the fifth resistors, and its output connected to the common terminal of the multiple output current mirror circuit, and a plurality, n, of bipolar transistors with their respective bases connected in common to the output of the operational amplifier

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