TEMPERATURE COMPENSATION BIAS CIRCUIT, HIGH-FREQUENCY AMPLIFIER, AND HIGH-FREQUENCY ATTENUATOR

摘要

PROBLEM TO BE SOLVED: To provide a temperature compensation bias circuit which can be operated at a negative voltage and can obtain such a characteristic that an output voltage is greatly changed with a change in temperature. SOLUTION: The circuit includes: a transistor 4 which has its drain terminal connected to a plus-side voltage application terminal 3 and is applied with a source-drain voltage Vgs in a voltage range near a threshold voltage Vth which shows a trend that the drain current increases with an increase in temperature; a diode 5 with its one end connected to a source terminal of the transistor 4 and the other end connected to one end of a resistor 6; a resistor 7 which has its one end connected to the other end of the resistor 6 and the other end connected to a minus-side voltage application terminal 1 and has a gate terminal of the transistor 4 connected to a connecting point of the resistor 6; and an output voltage terminal 2 which is connected to a connecting point between the diode 5 and the resistor 6 and from which output voltage is extracted. COPYRIGHT: (C)2009,JPO&INPIT