The invention discloses a kind of pressure sensors, mainly include a pressure sensing cells and a temperature compensation unit. The pressure sensing cells include an electric bridge being made of four groups of resistance, have a first input end, one second input terminal, one first output end and a second output terminal. The temperature compensation unit has a constant current source and a voltage-regulating circuit, and the constant current source and second input terminal couple, and export a constant current, and the voltage-regulating circuit then couples between the what first input end and second input terminal. When temperature change changes four groups of resistances of the electric bridge, there is the input of a constant current by the what electric bridge, therefore the voltage-regulating circuit is the voltage that can change between the first input end and second input terminal, the electric current for flowing through the electric bridge is identical as the constant current, is compensated with carrying out the zero drift of temperature change to pressure sensor.本發明揭露一種壓力感測器，主要包含一壓力感測單元以及一溫度補償單元。該壓力感測單元包含一由四組電阻組成之電橋，其具有一第一輸入端、一第二輸入端、一第一輸出端以及一第二輸出端。該溫度補償單元具有一定電流源與一電壓調整電路，該定電流源與該第二輸入端耦接，並輸出一定電流，而該電壓調整電路則耦接於該第一輸入端與該第二輸入端之間。當溫度變化改變該電橋之四組電阻阻值時，由於該電橋具有一定電流之輸入，故該電壓調整電路即會改變該第一輸入端與該第二輸入端之間的電壓，使流經該電橋之電流與該定電流相同，以對壓力感測器進行溫度變化之零點飄移補償。
