Abstract: A physical quantity sensor includes a physical quantity detection circuit having a determination circuit that determines whether a value of a physical quantity signal continuously remains within a predetermined range in a predetermined period, determines that a physical quantity detection element is in a first state of normal operation when the value does not continuously remain, and determines that the physical quantity detection element is in a second state of abnormal operation when the value continuously remains, a control circuit that stores first information based on a determination result of the determination circuit is stored in a control circuit as a setting information and a communication section that outputs the setting information stored in from the control circuit to the outside when the determination result of the determination circuit indicates the second state.

Abstract: A physical quantity sensor includes a first element section in which first capacitances varying in accordance with a physical quantity have first saturation capacitance values at which the first capacitances are saturated by a first physical quantity, a second element section in which a second capacitances varying in accordance with the physical quantity have second saturation capacitance values at which the second capacitances are saturated by a second physical quantity smaller in absolute value than the first physical quantity, a multiplexer for outputting the first signals from the first element section and the second signals from the second element section, and a determination circuit that determines whether or not the level of the second signal input via the multiplexer reaches a threshold value which is a level of the second signal when the second physical quantity acts.

Abstract: A physical quantity sensor includes a physical quantity detection circuit having a determination circuit that determines whether a value of a physical quantity signal continuously remains within a predetermined range in a predetermined period, determines that a physical quantity detection element is in a first state of normal operation when the value does not continuously remain, and determines that the physical quantity detection element is in a second state of abnormal operation when the value continuously remains, a control circuit that stores first information based on a determination result of the determination circuit is stored in a control circuit as a setting information and a communication section that outputs the setting information stored in from the control circuit to the outside when the determination result of the determination circuit indicates the second state.

Abstract: A physical quantity sensor includes a first element section in which first capacitances varying in accordance with a physical quantity have first saturation capacitance values at which the first capacitances are saturated by a first physical quantity, a second element section in which a second capacitances varying in accordance with the physical quantity have second saturation capacitance values at which the second capacitances are saturated by a second physical quantity smaller in absolute value than the first physical quantity, a multiplexer for outputting the first signals from the first element section and the second signals from the second element section, and a determination circuit that determines whether or not the level of the second signal input via the multiplexer reaches a threshold value which is a level of the second signal when the second physical quantity acts.

Abstract: A physical quantity sensor includes: a container that includes a storage space and a bottom plate that configures an inner bottom surface of the storage space; a sensor element that is attached to the inner bottom surface; a circuit element that is attached to a surface of the sensor element on the opposite side of the inner bottom surface, and is electrically connected with the sensor element; and a ground plane that is provided on the bottom plate. The ground GND plane is provided apart from the inner bottom surface.

Abstract: A physical quantity sensor includes a substrate, an acceleration sensor mounted on the substrate, an integrated circuit mounted on the substrate and stacked with the acceleration sensor, and serial communication wirings provided to the substrate. In a plan view of the acceleration sensor element, a bonding wire connecting the acceleration sensor element to the integrated circuit is disposed on an opposite side to the serial communication wirings with respect to a virtual central line of the acceleration sensor element.

Abstract: A physical quantity detection circuit includes a physical quantity signal generation circuit that generates a physical quantity signal according to magnitude of a physical quantity based on a detection signal output from a physical quantity detection element, an abnormality determination circuit that determines whether or not the physical quantity detection element is potentially abnormal based on a value of the physical quantity signal and an amount of change of the value of the physical quantity signal, and an abnormality diagnostic circuit that diagnoses whether or not the physical quantity detection element is abnormal if the abnormality determination circuit determines that the physical quantity detection element is potentially abnormal.

Abstract: A physical quantity sensor includes a substrate, an acceleration sensor mounted on the substrate, an integrated circuit mounted on the substrate and stacked with the acceleration sensor, and serial communication wirings provided to the substrate. In a plan view of the acceleration sensor element, a bonding wire connecting the acceleration sensor element to the integrated circuit is disposed on an opposite side to the serial communication wirings with respect to a virtual central line of the acceleration sensor element.

Abstract: A physical quantity detection circuit includes a physical quantity signal generation circuit that generates a physical quantity signal according to magnitude of a physical quantity based on a detection signal output from a physical quantity detection element, an abnormality determination circuit that determines whether or not the physical quantity detection element is potentially abnormal based on a value of the physical quantity signal and an amount of change of the value of the physical quantity signal, and an abnormality diagnostic circuit that diagnoses whether or not the physical quantity detection element is abnormal if the abnormality determination circuit determines that the physical quantity detection element is potentially abnormal.

Abstract: A physical quantity sensor includes: a container that includes a storage space and a bottom plate that configures an inner bottom surface of the storage space; a sensor element that is attached to the inner bottom surface; a circuit element that is attached to a surface of the sensor element on the opposite side of the inner bottom surface, and is electrically connected with the sensor element; and a ground plane that is provided on the bottom plate. The ground GND plane is provided apart from the inner bottom surface.

Abstract: A signal processing circuit includes an I/V conversion circuit (current/voltage conversion section) that converts an oscillation current of a vibrator into a voltage, an RC filter (phase shift section) that shifts a phase of the output signal of the I/V conversion circuit, a full-wave rectifier (part of a drive amplitude control section) that binarizes a signal that has been shifted in phase to generate a switch control signal, a comparator (reference signal generation section) that generates a reference signal for synchronous detection based on the output signal of the I/V conversion circuit, and an EXOR circuit (clock signal generation section) that generates a clock signal for a switched capacitor filter (SCF) that has a frequency twice a frequency of a drive signal based on a phase difference between the reference signal and the switch control signal.

Abstract: A detection circuit includes a synchronous detection circuit (synchronous detection section) that synchronously detects a signal that includes a detection signal of a vibrator (an output signal of an amplifier), a switched capacitor filter (SCF) circuit that filters a signal that has been synchronously detected by the synchronous detection circuit (an output signal of a programmable gain amplifier), and an output buffer that buffers and outputs a signal that has been filtered by the SCF circuit, the gain of the SCF circuit being larger than 1.

Abstract: A signal level conversion circuit 1 includes a first differential amplifier circuit 10 and a second differential amplifier circuit 20. The first differential amplifier circuit 10 multiplies a potential difference between a first input signal and a second input signal by G1 thereby providing an output signal. The second differential amplifier circuit 20 multiplies a potential difference between the output signal of the first differential amplifier circuit 10 and the second input signal by G2 thereby providing an output, where the two gains satisfy the relation of G1×G2<0 and 0<?(G1+1)×G2<2.

Abstract: A driver circuit includes a comparator (drive signal generation section) that generates a drive signal based on a signal obtained by converting an oscillation current of a vibrator that has been input via a first signal line into a voltage using an I/V conversion circuit (current/voltage conversion section), and supplies the drive signal to the vibrator via a second signal line, an oscillation detection circuit (oscillation detection section) that detects whether or not the oscillation current has reached a predetermined value after the vibrator has started to oscillate, a startup oscillation circuit (startup oscillation section) that assists an oscillation operation of the vibrator until the oscillation current reaches the predetermined value, and a switch that separates a capacitor from the second signal line until the oscillation current reaches the predetermined value, and connects the capacitor to the second signal line when the oscillation current has reached the predetermined value.

Abstract: A signal level conversion circuit 1 includes a first differential amplifier circuit 10 and a second differential amplifier circuit 20. The first differential amplifier circuit 10 multiplies a potential difference between a first input signal and a second input signal by G1 thereby providing an output signal. The second differential amplifier circuit 20 multiplies a potential difference between the output signal of the first differential amplifier circuit 10 and the second input signal by G2 thereby providing an output, where the two gains satisfy the relation of G1×G2<0 and 0<?(G1+1)×G2<2.

Abstract: A signal level conversion circuit 1 includes a first differential amplifier circuit 10 and a second differential amplifier circuit 20. The first differential amplifier circuit 10 multiplies a potential difference between a first input signal and a second input signal by G1 thereby providing an output signal. The second differential amplifier circuit 20 multiplies a potential difference between the output signal of the first differential amplifier circuit 10 and the second input signal by G2 thereby providing an output, where the two gains satisfy the relation of G1×G2<0 and 0<?(G1+1)×G2<2.

Abstract: A driver circuit includes a comparator (drive signal generation section) that generates a drive signal based on a signal obtained by converting an oscillation current of a vibrator that has been input via a first signal line into a voltage using an I/V conversion circuit (current/voltage conversion section), and supplies the drive signal to the vibrator via a second signal line, an oscillation detection circuit (oscillation detection section) that detects whether or not the oscillation current has reached a predetermined value after the vibrator has started to oscillate, a startup oscillation circuit (startup oscillation section) that assists an oscillation operation of the vibrator until the oscillation current reaches the predetermined value, and a switch that separates a capacitor from the second signal line until the oscillation current reaches the predetermined value, and connects the capacitor to the second signal line when the oscillation current has reached the predetermined value.

Abstract: A signal processing circuit includes an I/V conversion circuit (current/voltage conversion section) that converts an oscillation current of a vibrator into a voltage, an RC filter (phase shift section) that shifts a phase of the output signal of the I/V conversion circuit, a full-wave rectifier (part of a drive amplitude control section) that binarizes a signal that has been shifted in phase to generate a switch control signal, a comparator (reference signal generation section) that generates a reference signal for synchronous detection based on the output signal of the I/V conversion circuit, and an EXOR circuit (clock signal generation section) that generates a clock signal for a switched capacitor filter (SCF) that has a frequency twice a frequency of a drive signal based on a phase difference between the reference signal and the switch control signal.

Abstract: A detection circuit includes a synchronous detection circuit (synchronous detection section) that synchronously detects a signal that includes a detection signal of a vibrator (an output signal of an amplifier), a switched capacitor filter (SCF) circuit that filters a signal that has been synchronously detected by the synchronous detection circuit (an output signal of a programmable gain amplifier), and an output buffer that buffers and outputs a signal that has been filtered by the SCF circuit, the gain of the SCF circuit being larger than 1.

Abstract: A signal level conversion circuit 1 includes a first differential amplifier circuit 10 and a second differential amplifier circuit 20. The first differential amplifier circuit 10 multiplies a potential difference between a first input signal and a second input signal by G1 thereby providing an output signal. The second differential amplifier circuit 20 multiplies a potential difference between the output signal of the first differential amplifier circuit 10 and the second input signal by G2 thereby providing an output, where the two gains satisfy the relation of G1×G2<0 and 0<?(G1+1)×G2<2.