Semiconductor device
AssigneeRenesas Electronics Corporation
InventorAsaki MIZUTA
Life of this patent
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Abstract
A switch group selectively outputs a signal input from IC terminals and a reference voltage. Another switch group selectively outputs a signal input from IC terminals and a reference voltage. A differential amplifier amplifies a differential voltage between a signal output from the switch group and a signal output from the another switch group. The switch group and the another switch group include the same number of switches. When to select any of signals input from the IC terminals in the switch group, a reference voltage is selected in the another switch group. When to select any of signals input from the IC terminals in the another switch group, a reference voltage is selected in the switch group.
Claims20
A semiconductor device comprising:
- a first group of sensor coupling terminals to which a first group of sensors are coupled;
- a second group of sensor coupling terminals to which a second group of sensors are coupled;
- a first switch group which selectively outputs a signal input from the first group of sensor coupling terminals and a reference voltage, from an output terminal;
- a second switch group which selectively outputs a signal input from the second group of sensor coupling terminals and the reference voltage, from an output terminal;
- and
- a differential amplifier which has a first input terminal coupled to the output terminal of the first switch group and a second input terminal coupled to the output terminal of the second switch group, and amplifies and outputs a differential voltage between the first input terminal and the second input terminal,
- wherein a number of switches included in the first switch group is equal to a number of switches included in the second switch group.
A semiconductor device comprising:
- a first group of sensor coupling terminals to which a first group of sensors are coupled;
- a second group of sensor coupling terminals to which a second group of sensors are coupled;
- a first switch group which selectively outputs a signal input from the first group of sensor coupling terminals and a reference voltage, from an output terminal;
- a second switch group which selectively outputs a signal input from the second group of sensor coupling terminals and the reference voltage, from an output terminal;
- a switch control circuit which controls the first switch group and the second switch group to select one sensor included in the first group of sensors or the second group of sensors;
- a differential amplifier which has a first input terminal coupled to the output terminal of the first switch group and a second input terminal coupled to the output terminal of the second switch group, and amplifies and outputs a differential voltage between the first input terminal and the second input terminal;
- and
- a signal process circuit which performs a signal process for an output signal of the differential amplifier,
- wherein a number of switches included in the first switch group is equal to a number of switches included in the second switch group, and
- wherein, when to select a sensor included in the first group of sensors, the switch control circuit controls to select any of signals input from the first group of sensor coupling terminals in the first switch group and to select the reference voltage in the second switch group, and when to select a sensor included in the second group of sensors, the switch control circuit controls to select any of signals input from the second group of sensor coupling terminals in the second switch group and to select the reference voltage in the first switch group.
Dependencies are inferred from the claim text.