| 摘要 |
<p>PURPOSE:To obtain the linearity of a voltage frequency converting characteristic and, simultaneously, to easily set a voltage frequency converting gain by controlling a constant current source to charge and discharge a capacitor, through a voltage current converter. CONSTITUTION:The current value of a constant current source 1 is controlled by the current value in which a control voltage is voltage-current-converted. Namely, in a voltage current converting circuit 9, the currents to flow in a P channel transistor 11 corresponding to the current source 1 and a transistor to compose a current mirror circuit are proportionate to a control voltage V, and the characteristic of an oscillating circuit is made into the characteristic to have the linearity. Consequently, by changing a resistance 15, the converting gain of the voltage current converter 9 can be easily changed. Thus, even when the title circuit is made into an integrated circuit, a voltage current gain, namely, the voltage frequency converting gain can be easily set by connecting the resistance 15 to an external part.</p> |
