Chopper amplifier circuit and semiconductor device
AssigneesSeiko Instruments Inc., Gakkouhoujin Chikoujigakuen
InventorsHirokazu Yoshizawa, Ryoichi Anzai, Toshiyuki Uchida, Minoru Ariyama, Atsushi Igarashi, Akira Takeda
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Abstract
Provided is a chopper amplifier circuit capable of reducing an offset voltage of a sensor bridge and temperature characteristics of the offset voltage. An offset adjusting voltage generation circuit for generating a voltage equal to an offset voltage of a sensor bridge and an offset temperature characteristics adjusting voltage generation circuit for generating a voltage having temperature characteristics equal to those of the offset voltage are provided. These output voltages are chopper-modulated and subtracted from a chopper-modulated output signal of the sensor bridge.
Claims7
A chopper amplifier circuit for amplifying a signal output from a sensor bridge, comprising:
- an offset adjusting voltage generation circuit,
- wherein an offset voltage of the sensor bridge is cancelled with an offset adjusting voltage generated by the offset adjusting voltage generation circuit, and
- wherein the offset adjusting voltage is equal in magnitude to the offset voltage of the sensor bridge, and has a polarity opposite to a polarity of the offset voltage.
A chopper amplifier circuit for amplifying a signal output from a sensor bridge, comprising:
- an offset adjusting voltage generation circuit,
- wherein an offset voltage of the sensor bridge is cancelled with an offset adjusting voltage generated by the offset adjusting voltage generation circuit, and
- wherein the offset adjusting voltage is equal in magnitude to the offset voltage of the sensor bridge, and has a polarity identical to a polarity of the offset voltage.
A chopper amplifier circuit, comprising:
- an input terminal for inputting a sensor signal output from a sensor bridge;
- a first multiplier connected to the input terminal;
- a first amplifying circuit connected to the first multiplier;
- an offset adjusting voltage generation circuit;
- a third multiplier connected to the offset adjusting voltage generation circuit;
- a third amplifying circuit connected to the third multiplier;
- an adder for adding an output of the first amplifying circuit and an output of the third amplifying circuit;
- a second amplifying circuit connected to the adder;
- and
- a second multiplier connected to the second amplifying circuit.
Dependencies are inferred from the claim text.