Patent ID: 8884816

Claim:
A temperature compensating device, for providing an active bias to an amplifier, comprising: a first node, electrically connected to an output of the amplifier; a second node, electrically connected to an output of the amplifier; a voltage source; a plurality of loads, for providing a current to the first node according to a first voltage provided by the voltage source and providing a second voltage to the second node, wherein at least tow loads of the plurality of loads are electrically connected to the first node and the second node; and only a current generator, for adjusting the current provided to the first node according to an impedance variation caused by a first load of the plurality of loads for keeping the current within a specified range; wherein the first load of the plurality of loads is a thermistor for generating the impedance variation in response to variation of an ambient temperature; wherein the second voltage varies in response to the impedance variation caused by the first load.