Constant-current source circuit, intermediate-frequency gain control circuit and mobile terminal device

Abstract

In order to provide a constant current source circuit which is capable of covering variety of specifications in a single circuit, there is provided a constant-current source circuit provided having a desired temperature characteristic with a current regulation being set at a predetermined value, in which a first current unit generates a first constant current based on a first resistor connected between a pin and the ground; a second current unit generates a second constant current based on a second resistor connected between a pin and the ground; an adder adds the first and second constant currents; a current amplifying unit generates a third constant current by adding the constant-currents and then multiplying n-fold to inflow or outflow the third constant current via the pin; a current regulation of the third constant current is set at a predetermined value by determining the resistances of the first and second resistors.

Dependencies are inferred from the claim text.