| 摘要 |
A voltage-to-current converter circuit comprises first and second amplifiers each having a noninverting input, an inverting input and an output, the noninverting inputs of the first and second amplifiers being respectively connected to an input terminal for receiving an input signal and circuit ground, a first impedance element connected between the inverting input of the first amplifier and circuit ground, a second impedance element connected between the output and the inverting input of the first amplifier, a third impedance element connected between the output of the i first amplifier and an output terminal to be connected to a load, a fourth impedance element connected between the inverting input of the second amplifier and the output terminal, a fifth impedance element connected between the output and the inverting input of the second amplifier, and a sixth impedance element connected between the output of second amplifier and the inverting input of first amplifier. When the second to sixth impedance elements are selected to have respective impedance values Z2 to Z6 which satisfy an equation <IMAGE> the voltage-to-current converter circuit operates as a constant current amplifier which is capable of supplying the load with an output current signal of a constant amplitude when the input signal voltage is constant, regardless of the impedance value of the load.
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