| 摘要 |
Briefly in accordance with one aspect of the present invention, a voltage-to-current converter for converting an input voltage signal to an output current signal, exhibits a substantially linear voltage/current characteristics over the entire available voltage signal range. The voltage-to-current converter comprises a first voltage-to-current converter having a substantially linear voltage/current characteristic for input voltage signals smaller than a first reference voltage signal level and up to substantially the minimum voltage signal level generated by a DC power supply employed to drive the voltage-to-current converter. A second voltage-to-current converter has a substantially linear voltage/current characteristic for voltage input signals larger than a second reference voltage signal level and up to substantially the maximum voltage signal level generated by the DC power supply. A control circuit is coupled to activate the first voltage-to-current converter, when the input voltage signal is smaller than the first reference voltage signal, and to activate the second voltage-to-current converter when the input voltage signal is larger than the second reference voltage signal level.
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