PHYSICAL QUANTITY SENSOR
First Claim
1. A physical quantity sensor comprising:
- a driving circuit that drives a sensor element based on a reference signal;
said sensor element that is driven by said driving circuit to convert an externally applied physical quantity to an electrical signal; and
an amplifier circuit that amplifies an output signal of said sensor element whereinsaid driving circuit controls a driving signal, which drives said sensor element, based on the reference signal so that the driving signal is at a constant level, andsaid amplifier circuit has a gain characteristic that amplifies an output signal in a direction reverse to a direction in which the reference signal varies or the driving signal of said driving circuit varies.
2 Assignments
0 Petitions
Accused Products
Abstract
A physical quantity sensor 1 comprises a driving circuit 4 that drives a sensor element based on a reference signal; the sensor element 3 that is driven by the driving circuit 4 to convert an externally applied physical quantity to an electrical signal; and an amplifier circuit 5 that amplifies an output signal of the sensor element 3. The driving circuit 4 controls a driving signal, which drives the sensor element, based on the reference signal so that the driving signal is at a fixed level, and the amplifier circuit 5 has a gain characteristic that amplifies the output signal in a direction reverse to a direction in which the reference signal varies or the driving signal of the driving circuit varies. This configuration allows the physical quantity sensor to reduce output level variations in the sensor output against signal level variations in the reference signal and to make the sensitivity constant.
-
Citations
11 Claims
-
1. A physical quantity sensor comprising:
-
a driving circuit that drives a sensor element based on a reference signal; said sensor element that is driven by said driving circuit to convert an externally applied physical quantity to an electrical signal; and an amplifier circuit that amplifies an output signal of said sensor element wherein said driving circuit controls a driving signal, which drives said sensor element, based on the reference signal so that the driving signal is at a constant level, and said amplifier circuit has a gain characteristic that amplifies an output signal in a direction reverse to a direction in which the reference signal varies or the driving signal of said driving circuit varies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification