WO2015072090A1 - 物理量検出回路、物理量センサ及び電子機器 - Google Patents
物理量検出回路、物理量センサ及び電子機器 Download PDFInfo
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- WO2015072090A1 WO2015072090A1 PCT/JP2014/005378 JP2014005378W WO2015072090A1 WO 2015072090 A1 WO2015072090 A1 WO 2015072090A1 JP 2014005378 W JP2014005378 W JP 2014005378W WO 2015072090 A1 WO2015072090 A1 WO 2015072090A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5607—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces using vibrating tuning forks
- G01C19/5614—Signal processing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5776—Signal processing not specific to any of the devices covered by groups G01C19/5607 - G01C19/5719
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/097—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by vibratory elements
Definitions
- the present invention relates to a physical quantity detection circuit used for a physical quantity sensor that detects a physical quantity given from the outside, and a physical quantity sensor and an electronic device provided with the circuit.
- a physical quantity sensor capable of detecting a physical quantity has various effects such as camera shake detection of a digital camera, attitude control of a mobile body (aircraft, car, robot, ship etc.), guidance of missiles and spacecraft Used in various technical fields.
- a physical quantity sensor includes a physical quantity sensor element that outputs a sensor signal according to a physical quantity given from the outside, and a physical quantity detection circuit that extracts a physical quantity signal from a sensor signal using a detection signal.
- a physical quantity detection circuit that extracts a physical quantity signal from a sensor signal using a detection signal.
- Patent Document 1 discloses a signal processing circuit of a biaxial angular velocity sensor constituted by a digital circuit.
- an analog / digital conversion circuit converts a sensor signal to a digital sensor signal from a sensor
- a sine wave signal generation circuit generates a digital sine wave signal
- a digital multiplier is a digital sensor signal and a digital sine signal. Multiply with the wave signal.
- FIG. 13 is a diagram for explaining the processing of the analog / digital conversion circuit in this physical quantity sensor.
- the analog / digital conversion circuit samples the sensor signal every sampling cycle in synchronization with the sampling clock, and analog values (amplitude values) A0, A1, A2,... Of the sampled sensor signal are digital values P0, P1,. Convert to P2,.
- Patent No. 2728300 gazette
- the physical quantity sensor is used together with a physical quantity sensor element that outputs a sensor signal according to the physical quantity.
- the physical quantity detection circuit used for the physical quantity sensor includes a signal generation unit that generates a detection signal, and a multiplier that multiplies the sensor signal and the detection signal.
- the signal generation unit generates a detection signal by converting a first phase of a predetermined signal having a frequency corresponding to the frequency of the sensor signal into a second phase and calculating an amplitude value corresponding to the second phase.
- This physical quantity sensor can improve the accuracy of phase adjustment while suppressing an increase in sampling frequency.
- FIG. 1 is a block diagram of a physical quantity sensor according to an embodiment.
- FIG. 2 is a block diagram of a physical quantity sensor element and a drive circuit of the physical quantity sensor according to the embodiment.
- FIG. 3 is a block diagram of a sine wave generation unit of the physical quantity sensor according to the embodiment.
- FIG. 4 is a block diagram of another sine wave generation unit of the physical quantity sensor according to the embodiment.
- FIG. 5 is a block diagram of another physical quantity sensor according to the embodiment.
- FIG. 6 is a block diagram of still another physical quantity sensor according to the embodiment.
- FIG. 7 is a block diagram of still another physical quantity sensor according to the embodiment.
- FIG. 8 is a block diagram of still another physical quantity sensor according to the embodiment.
- FIG. 9 is a block diagram of still another physical quantity sensor according to the embodiment.
- FIG. 10 is a block diagram of another sine wave generating unit of the physical quantity sensor shown in FIG.
- FIG. 11 is a block diagram of still another physical quantity sensor according to the embodiment.
- FIG. 12 is a block diagram of an electronic device equipped with the physical quantity sensor according to the embodiment.
- FIG. 13 is a diagram for explaining the processing of the analog / digital conversion circuit in the conventional physical quantity sensor.
- FIG. 1 is a block diagram of the physical quantity sensor 1 according to the first embodiment.
- the physical quantity sensor 1 includes a physical quantity sensor element 10, a drive circuit 11, and a physical quantity detection circuit 12.
- a drive signal Sdrv having a predetermined frequency is supplied from the drive circuit 11 and vibrates, and the sensor signal is vibrated according to a physical quantity (for example, angular velocity, acceleration, etc.) given from the outside in a vibrating state.
- the frequency of the sensor signal S10 corresponds to the frequency of the drive signal Sdrv.
- the center frequency of the sensor signal S10 corresponds to the frequency of the drive signal Sdrv.
- the physical quantity sensor element 10 is a tuning fork type angular velocity sensor.
- the drive circuit 11 supplies a drive signal Sdrv to the physical quantity sensor element 10.
- the physical quantity sensor element 10 vibrates in response to the drive signal Sdrv, and outputs a vibration signal Sosc corresponding to the vibration. Further, the drive circuit 11 adjusts the frequency and the amplitude of the drive signal Sdrv in accordance with the vibration signal Sosc from the physical quantity sensor element 10. The physical quantity detection circuit 12 detects a physical quantity based on the sensor signal S10 from the physical quantity sensor element 10.
- the drive circuit 11 will be described below.
- FIG. 2 is a block diagram of the physical quantity sensor element 10 and the drive circuit 11.
- the physical quantity sensor element 10 includes a tuning fork main body 10a, a driving piezoelectric element Pdrv, a vibration detecting piezoelectric element Posc, and angular velocity detecting piezoelectric elements PDa and PDb.
- the driving piezoelectric element Pdrv, the vibration detecting piezoelectric element Posc, and the angular velocity detecting piezoelectric elements PDa and PDb are provided in the tuning fork main body 10a.
- the driving piezoelectric element Pdrv vibrates the tuning fork main body 10 a in accordance with the frequency and the amplitude of the driving signal Sdrv from the driving circuit 11.
- the drive circuit 11 includes a monitor amplifier 11a, an automatic gain control amplifier (AGC) 11b, and a drive amplifier 11c.
- the monitor amplifier 11a converts the vibration signal Sosc, which is the charge (current) from the physical quantity sensor element 10, into a voltage and supplies it as a signal Smon to the AGC 11b.
- the AGC 11 b amplifies the signal Smon and supplies a signal Sagc, which is a voltage, to the drive amplifier 11 c.
- the AGC 11 b changes the amplification gain for amplifying the signal Smon so that the voltage of the signal Sagc supplied to the drive amplifier 11 c has a constant value.
- the drive amplifier 11c controls the frequency and amplitude of the drive signal Sdrv in accordance with the signal Sagc output from the automatic gain control amplifier 11b. As described above, by adjusting the drive signal Sdrv in accordance with the vibration signal Sosc, the maximum vibration amplitude and the vibration frequency of the physical quantity sensor element 10 are kept constant.
- the physical quantity detection circuit 12 will be described below.
- the physical quantity detection circuit 12 includes a waveform shaping circuit 101, a multiplication circuit 102, a signal generation unit 100, an input amplifier 103, an analog / digital converter (ADC) 105, and a multiplier 115. , Digital filter 120 and the like.
- ADC analog / digital converter
- the waveform shaping circuit 101 converts the vibration signal Sosc into a square wave and outputs the square wave as a reference clock CKref.
- the waveform shaping circuit 101 is configured by a comparator or an inverter.
- the frequency of the reference clock CKref is substantially the same as the frequency of the drive signal Sdrv, that is, the frequency of the sensor signal S10.
- the multiplying circuit 102 multiplies the reference clock CKref from the waveform shaping circuit 101 to generate a multiplied clock CKx having a frequency higher than that of the reference clock CKref.
- the multiplier circuit 102 is configured by a PLL (Phase Locked Loop).
- the input amplifier 103 converts the sensor signal S10 from the physical quantity sensor element 10 into a voltage and outputs it as an analog sensor signal Asnc.
- the sensor signal S10 includes various unnecessary signals.
- the direction of the drive vibration driven and vibrated by the drive signal Sdrv and the direction of the deflection according to the applied physical quantity (angular velocity etc.) to be detected are perpendicular to each other. It does not affect without interference.
- the drive vibration interferes with the deflection according to the physical quantity, and an unnecessary signal which is an unnecessary signal for detection of the physical quantity is mixed in the sensor signal S10.
- the mechanical coupling cancellation unit (MCC) 104 adds a mechanical coupling (MC) signal obtained by phase-adjusting the drive signal Sdrv to the analog sensor signal Asnc, thereby canceling at least a part of unnecessary signals included in the analog sensor signal Asnc. And suppress unnecessary signals.
- the analog-to-digital converter 105 samples the analog sensor signal Asnc in synchronization with the sampling clock CKsp, and converts an amplitude value, which is a sampled analog value, into a digital value. Thereby, the analog sensor signal Asnc is converted into a digital sensor signal Dsnc constituted by a plurality of digital values.
- the amplitude of the unnecessary signal included in the sensor signal S10 may be extremely larger than the amplitude of the signal corresponding to the physical quantity to be detected. In this case, the dynamic range of the analog / digital converter 105 for the signal corresponding to the physical quantity can be increased by canceling the unnecessary signal included in the analog sensor signal Asnc input to the analog / digital converter 105. It is possible to detect physical quantities with high accuracy.
- the signal generation unit 100 includes a sine wave generation unit 106, a temperature detector 107, a low pass filter (LPF) 108, an analog / digital converter (ADC) 109, and a memory 110.
- LPF low pass filter
- ADC analog / digital converter
- the temperature detector 107 detects a temperature and outputs temperature information corresponding to the detected temperature.
- the temperature information is filtered by low pass filter 108 and then converted to digital values by analog to digital converter 109.
- the temperature information converted into the digital value is input to the sine wave generation unit 106 at regular intervals.
- the memory 110 holds a correction amount according to the temperature information.
- the temperature detector 107, the low pass filter 108, the analog / digital converter 109, and the memory 110 constitute a correction amount generation unit 111.
- FIG. 3 is a block diagram of the sine wave generation unit 106.
- the sine wave generation unit 106 includes a phase calculation unit 106 a and a sine wave generation unit 106 d, and is connected to the correction amount generation unit 111.
- the phase calculation unit 106 a calculates the phase ⁇ 1 based on the multiplied clock CKx obtained from the multiplication circuit 102. Furthermore, the phase calculation unit 106a acquires the correction coefficients a1, a2, and a3 corresponding to the temperature information Td obtained by the temperature detector 107 from the memory 110, and calculates the phase ⁇ 1 based on the acquired correction coefficients a1, a2, and a3. The converted phase ⁇ 2 is calculated. In the embodiment, the phase calculation unit 106a calculates the correction amount Ad and the phase ⁇ 2 according to the following equation using the phase ⁇ 1, the temperature information Td, and the correction coefficients a1, a2, and a3. The phase calculation unit 106a inputs the calculated phase ⁇ 2 to the sine wave generation unit 106d.
- the sine wave generation unit 106d generates a detection signal Ddet which is a sine wave by calculating an amplitude value corresponding to the input phase ⁇ 2.
- a calculation method for generating a sine wave by giving a certain phase for example, a CORDIC operation can be used.
- the signal generation unit 100 converts the phase ⁇ 1 of the predetermined signal having a frequency corresponding to the frequency of the sensor signal S10 into the phase ⁇ 2, and calculates the amplitude value corresponding to the phase ⁇ 2 to obtain the detection signal Ddet. Operate to generate.
- the predetermined signal is the vibration signal Sosc.
- FIG. 4 is a block diagram of another sine wave generation unit 206 according to the embodiment.
- the sine wave generation unit 206 includes a sine wave generation unit 206 d instead of the sine wave generation unit 106 d of the sine wave generation unit 106.
- the sine wave generation unit 206d includes a phase calculation unit 106a, an address calculation unit 106b, a memory unit 106c, and a waveform generation unit 306d.
- the phase calculation unit 106 a calculates the phase ⁇ 2 from the phase ⁇ 1 based on the multiplied clock CKx obtained from the multiplication circuit 102. Furthermore, the correction amount Ad corresponding to the temperature information Td obtained by the temperature detector 107 is acquired from the memory 110, and the phase ⁇ 1 is converted based on the acquired correction amount Ad to obtain ⁇ 2, thereby calculating the phase ⁇ 2. . Then, the phase calculation unit 106a outputs the calculated phase ⁇ 2 to the address calculation unit 106b.
- the address calculation unit 106 b holds an address corresponding to the phase.
- Table 1 shows the values of the phases held by the address calculation unit 106 b and the addresses corresponding to those values.
- the address calculation unit 106b selects an address corresponding to the phase ⁇ 2 input from the phase calculation unit 106a, and outputs the selected address to the memory unit 106c. More specifically, the address calculation unit 106b determines that the address ad1 corresponding to the value of the closest phase smaller than the phase ⁇ 2 among the values of the phase shown in Table 1 and the closest phase larger than the phase ⁇ 2 The address ad2 corresponding to the value is selected and output to the memory unit 106c. For example, when the phase calculation unit 106 a calculates the phase ⁇ 2 to 0.06 (rad), the address calculation unit 106 b determines that the phase value smaller than 0.06 (rad) among the phase values shown in Table 1 is the closest phase value. And the address “3” corresponding to the value of the phase which is larger than 0.06 (rad) and closest to the phase is selected and output to the memory unit 106 c.
- the address calculation unit 106 b outputs the addresses ad 1 and ad 2 to the memory unit 106 c and, at the same time, outputs the address ad 0 corresponding to the phase ⁇ 2 to the waveform generation unit 306 d. More specifically, as shown in Table 1, the address is proportional to the phase, that is, by linearly holding the relationship between the phase and the address, the address ad0 corresponding to the phase ⁇ 2 corresponds to a phase corresponding to a certain address. To the next address using the phase step Ph which is the increment of the phase corresponding to the next address.
- the memory unit 106 c holds address values and data of amplitude values corresponding to those values.
- Table 2 shows the values of the addresses held by the memory unit 106c and data corresponding to them.
- the memory unit 106c outputs data data1 and data2 corresponding to the addresses ad1 and ad2 input from the address calculation unit 106b to the waveform generation unit 306d. For example, when the selected address "2" "3" is input, the memory unit 106c generates the waveform 0.0049 corresponding to the address "2" and the data 0.0074 corresponding to the address "3". Output to the unit 306 d.
- the waveform generation unit 306d detects the detection signal Ddet, which is a sine wave, based on the addresses ad0, ad1, and ad2 input from the address calculation unit 106b and the data data1 and data2 input from the memory unit 106c. For example, it can be calculated by the following equation 3.
- the multiplier 115 multiplies the digital sensor signal Dsnc from the analog / digital converter 105 by the detection signal Ddet generated by the sine wave generation unit 106 (206). Thereby, the physical quantity signal corresponding to the physical quantity detected by the physical quantity sensor element 10 is detected.
- the digital filter 120 passes only low frequency components of the physical quantity signal detected by the multiplier 115 as noise detection and the like as the digital detection signal Dphy.
- the physical quantity sensor element 10 in each of the above embodiments is not limited to the tuning fork type, and may be a cylindrical type, a regular triangular prism type, a regular square prism type, a ring type, or any other shape.
- FIG. 5 is a block diagram of another physical quantity sensor 201 according to the embodiment.
- the physical quantity sensor 201 includes a physical quantity sensor element 210 instead of the physical quantity sensor element 10 of the physical quantity sensor 1 shown in FIGS. 1 and 2.
- the physical quantity sensor element 210 is a capacitive acceleration sensor.
- the physical quantity sensor element 210 includes a fixed unit 10b, a movable unit 10c, movable electrodes Pma1 and Pmb1, detection electrodes Pfa and Pfb, and a differential amplifier.
- the movable portion 10c is coupled to the fixed portion 10b so as to be displaced according to the acceleration.
- the movable electrodes Pma1 and Pmb1 are disposed on the movable portion 10c.
- the detection electrodes Pfa and Pfb are disposed on the fixed portion 10b so as to face the movable electrodes Pma1 and Pmb1, respectively.
- a capacitive element Ca is formed by the movable electrode Pma1 and the detection electrode Pfa which face each other, and a capacitive element Cb is formed by the movable electrode Pmb1 and the detection electrode Pfb which face each other.
- the drive signals Sdrv from the drive circuit 11 are supplied to the capacitive elements Ca and Cb, respectively.
- the differential amplifier outputs a sensor signal S10 corresponding to the difference between the amounts of charge generated in the detection electrodes Pfa and Pfb.
- a sensor signal S10 corresponding to this difference is output.
- FIG. 6 is a block diagram of another physical quantity sensor 301 according to the embodiment.
- the physical quantity sensor 301 includes a physical quantity sensor element 310 instead of the physical quantity sensor element 10 of the physical quantity sensor 1 shown in FIGS. 1 and 2.
- the physical quantity sensor element 310 is a capacitive angular velocity sensor.
- the physical quantity sensor element 310 has a movable portion 10c, drive electrodes Pma2 and Pmb2, and detection electrodes Pfa and Pfb.
- the movable portion 10c and the drive electrodes Pma2 and Pmb2 are arranged in the direction 301a such that the movable portion 10c is located between the drive electrodes Pma2 and Pmb2.
- the movable portion 10c and the detection electrodes Pfa and Pfb are arranged in a direction 301b perpendicular to the direction 301a such that the movable portion 10c is located between the detection electrodes Pfa and Pfb.
- the detection electrode Pfa and the movable portion 10c form a capacitive element Ca having a capacitance.
- the detection electrode Pfb and the movable portion 10c form a capacitive element Cb having a capacitance.
- the movable portion 10c By supplying the drive signal Sdrv from the drive circuit 11, the movable portion 10c performs drive vibration that vibrates in the direction 301a.
- the drive signal Sdrv When rotation is applied to the physical quantity sensor element 310 in a state where driving vibration is performed, detection vibration that vibrates in the direction 301 b according to the Coriolis force caused by the rotation is performed on the movable portion 10 c.
- One of the capacitance of the capacitive element Ca and the capacitance of the capacitive element Cb increases while the other decreases due to the detection vibration. As a result, a difference occurs in the amount of charge in each of the detection electrodes Pfa and Pfb, and a sensor signal S10 corresponding to this difference is output.
- FIG. 7 is a block diagram of still another physical quantity sensor 401 according to the embodiment.
- the physical quantity sensor 401 includes a downsampling processor 120 a provided downstream of the analog / digital converter 105.
- the downsampling processing unit 120a has a decimation filter.
- the downsampling processing unit 120a reduces the sampling frequency of the digital sensor signal Dsnc by decimating the digital value from the digital sensor signal Dsnc. Thereby, the sampling frequency of the digital detection signal Dphy supplied to the digital filter 120 can also be reduced, and the circuit size and power consumption of the digital filter 120 can be reduced.
- FIG. 8 is a block diagram of still another physical quantity sensor 501 according to the embodiment.
- the drive circuit 11 includes a band pass filter (BPF) 11d provided between the monitor amplifier 11a and the automatic gain control amplifier (AGC) 11b.
- BPF band pass filter
- AGC automatic gain control amplifier
- the drive signal Sdrv input to the waveform shaping circuit 101 may be acquired from the front stage or the rear stage of the band pass filter 11d.
- FIG. 9 is a block diagram of still another physical quantity sensor 601 according to the embodiment.
- the same parts as those of the physical quantity sensor 1 shown in FIG. as described above, although the MCC 104 suppresses unnecessary signals included in the analog sensor signal Asnc, part of the unnecessary signals may remain in the analog sensor signal Asnc. In this case, unnecessary signals remain and are included in the digital sensor signal Dsnc.
- the physical quantity sensor 601 shown in FIG. 9 suppresses unnecessary signals included in the digital sensor signal Dsnc.
- the physical quantity sensor 601 further includes an unnecessary signal cancellation unit 151 provided between the ADC 105 and the multiplier 115.
- the sine wave generation unit 106 of the signal generation unit 100 generates the digital cancellation signal Du based on the vibration signal Sosc which is a predetermined signal, and the unnecessary signal cancellation unit 151 adds the digital cancellation signal Du to the digital sensor signal Dsnc At least a part of the unnecessary signal included in the sensor signal Dsnc is canceled to suppress the unnecessary signal.
- the sine wave generation unit 106 can generate the detection signal Ddet itself supplied to the multiplier 115 or a signal obtained by shifting the phase of the detection signal Ddet as the digital cancellation signal Duc.
- FIG. 10 is a block diagram of another sine wave generation unit 306 of the physical quantity sensor 601 shown in FIG.
- the sine wave generation unit 306 further includes a waveform generation unit 406d in addition to the sine wave generation unit 106 (206) shown in FIG. 3 (FIG. 4).
- the waveform generation unit 406 d generates a digital cancellation signal Du based on the phase ⁇ 2 output from the phase calculation unit 106 a and outputs the digital cancellation signal Du to the multiplier 115.
- the sine wave generation unit 306 can make the waveform of the digital cancellation signal Duc different in phase, frequency, and waveform from the sine wave of the detection signal Ddet, and the unnecessary signal included in the digital sensor signal Dsnc output from the ADC 105 It can be effectively suppressed.
- FIG. 11 is a block diagram of still another physical quantity sensor 701 according to the embodiment.
- the physical quantity sensor 701 further includes a cancellation signal generation unit 606 that generates a digital cancellation signal Du based on the temperature information Td obtained from the correction amount generation unit 111 and the correction coefficient.
- the correction factor supplied to the cancellation signal generation unit 606 may be different from the correction factors a1, a2, a3 supplied to the sine wave generation unit 106 (206).
- the cancel signal generation unit 606 can make the frequency, phase, and waveform of the digital cancel signal Duc different from those of the detection signal Ddet, and the unnecessary signal included in the digital sensor signal Dsnc output from the ADC 105 can be more effectively It can be suppressed.
- FIG. 12 is a block diagram of an electronic device 70 equipped with the physical quantity sensor 1 (401, 501, 601, 701) in the embodiment.
- the physical quantity sensor 1 (401, 501, 601, 701) is an angular velocity sensor.
- the electronic device 70 is, for example, a digital camera, and includes a physical quantity sensor 1 (401, 501, 601, 701), a display unit 71, a processing unit 72 such as a CPU, a memory 73, and an operation unit 74. There is.
- the physical quantity sensor 1 (401, 501, 601, 701) includes a physical quantity sensor element 10, a drive circuit 11, and a physical quantity detection circuit 12, as shown in FIG.
- the physical quantity sensor 1 has excellent characteristics such as small size, low power consumption, and high accuracy. Therefore, when the electronic device 70 is, for example, a video camera or a digital still camera, the electronic device 70 incorporating the physical quantity sensor 1 (401, 501, 601, 701) can be downsized, reduced in power consumption, or increased. Processing such as camera shake correction is possible.
- the electronic device 70 may be a car navigation system, a vehicle, an aircraft, or a robot other than a digital camera.
- the physical quantity detection circuit according to the present invention can improve the accuracy of phase adjustment while suppressing an increase in sampling frequency. Therefore, a physical quantity sensor (for example, tuning fork type used in mobile objects, mobile phones, digital cameras, game machines, etc.) It is useful for an angular velocity sensor, an electrostatic capacitance type acceleration sensor, etc.).
Abstract
Description
10 物理量センサ素子
11 駆動回路
12 物理量検出回路
70 電子機器
100 信号生成ユニット
105 アナログ/デジタル変換回路
106 正弦波生成ユニット
107 温度検出器
110 メモリ部
111 補正量生成部
115 乗算器
151 不要信号キャンセル部
Claims (11)
- 物理量に応じたセンサ信号を出力する物理量センサ素子と共に用いられる物理量検出回路であって、
検波信号を生成する信号生成ユニットと、
前記センサ信号と前記検波信号とを乗算する乗算器と、
を備え、
前記信号生成ユニットは、
前記センサ信号の周波数に対応する周波数を有する所定信号の第1の位相を第2の位相に変換し、
前記第2の位相に対応する振幅値を算出することで前記検波信号を生成する
ように動作する、物理量検出回路。 - 前記物理量センサ素子は振動を行っている状態で前記物理量に応じて前記センサ信号を出力し、
前記所定信号は前記センサ素子の前記振動に応じた振動信号である、請求項1に記載の物理量検出回路。 - 前記検波信号の波形は正弦波である、請求項1または2に記載の物理量検出回路。
- 前記信号生成ユニットは計算により前記第1の位相を前記第2の位相に変換する、請求項3に記載の物理量検出回路。
- 前記信号生成ユニットは、補正量生成部と、正弦波生成ユニットと、を有し、
前記補正量生成部は、温度情報を得る温度検出器と、前記温度情報に対応する補正量を保持するメモリ部とを含み、
前記正弦波生成ユニットは、前記補正量に基づいて前記第1の位相を前記第2の位相に変換する、請求項1または2に記載の物理量検出回路。 - 前記センサ信号をデジタルセンサ信号に変換するアナログ/デジタル変換回路をさらに備え、
前記乗算器は前記デジタルセンサ信号と前記検波信号とを乗算する、請求項1または2に記載の物理量検出回路。 - 前記アナログ/デジタル変換回路と前記乗算器との間に設けられた不要信号キャンセル部をさらに備え、
前記デジタルセンサ信号は不要信号を含み、
前記信号生成ユニットは前記所定信号に基づいてキャンセル信号を生成し、
前記不要信号キャンセル部は前記デジタルセンサ信号に前記キャンセル信号を加算することで前記不要信号を抑える、請求項6に記載の物理量検出回路。 - 前記物理量は角速度である、請求項1または2に記載の物理量検出回路。
- 物理量に応じたセンサ信号を出力する物理量センサ素子と、
前記物理量センサ素子に接続された物理量検出回路と、
を備え、
前記物理量検出回路は、
検波信号を生成する信号生成ユニットと、
前記センサ信号と前記検波信号とを乗算する乗算器と、
を含み、
前記信号生成ユニットは、
前記センサ信号の周波数に対応する周波数を有する所定の信号の第1の位相を第2の位相に変換し、
前記第2の位相に対応する振幅値を算出することで前記検波信号を生成する
ように動作する、物理量センサ。 - 前記物理量センサ素子は振動を行っている状態で前記物理量に応じて前記センサ信号を出力し、
前記所定信号は前記センサ素子の前記振動に応じた振動信号である、請求項9に記載の物理量センサ。 - 請求項9または10に記載の物理量センサを備えた電子機器。
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US14/911,253 US10018468B2 (en) | 2013-11-14 | 2014-10-23 | Physical-quantity detection circuit, physical-quantity sensor, and electronic device |
JP2015547622A JPWO2015072090A1 (ja) | 2013-11-14 | 2014-10-23 | 物理量検出回路、物理量センサ及び電子機器 |
DE112014005220.5T DE112014005220T5 (de) | 2013-11-14 | 2014-10-23 | Erfassungsschaltung für eine physikalische Größe, Sensor für eine physikalische Größe und elektronische Einrichtung |
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WO2021215077A1 (ja) * | 2020-04-21 | 2021-10-28 | パナソニックIpマネジメント株式会社 | センサシステム、センシング方法及びプログラム |
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JP6197347B2 (ja) * | 2013-04-24 | 2017-09-20 | セイコーエプソン株式会社 | 電子機器及び物理量検出装置 |
JP6492739B2 (ja) | 2015-02-20 | 2019-04-03 | セイコーエプソン株式会社 | 回路装置、物理量検出装置、電子機器及び移動体 |
JP6586735B2 (ja) * | 2015-02-20 | 2019-10-09 | セイコーエプソン株式会社 | 回路装置、物理量検出装置、電子機器及び移動体 |
CN105353695B (zh) * | 2015-12-10 | 2017-09-05 | 成都理工大学 | 一种反馈型事件驱动式模拟信号变频采集电路和集采方法 |
US20190257655A1 (en) * | 2016-03-24 | 2019-08-22 | Panasonic Intellectual Property Management Co., Ltd. | Composite sensor |
JP6982725B2 (ja) * | 2017-10-25 | 2021-12-17 | パナソニックIpマネジメント株式会社 | センサ |
JP6805188B2 (ja) * | 2018-01-26 | 2020-12-23 | 株式会社東芝 | 検出器 |
JP7024566B2 (ja) | 2018-04-06 | 2022-02-24 | 株式会社デンソー | 振動型ジャイロスコープ |
US11287443B2 (en) * | 2019-02-20 | 2022-03-29 | Invensense, Inc. | High performance accelerometer |
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- 2014-10-23 US US14/911,253 patent/US10018468B2/en active Active
- 2014-10-23 WO PCT/JP2014/005378 patent/WO2015072090A1/ja active Application Filing
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DE112014005220T5 (de) | 2016-08-18 |
US10018468B2 (en) | 2018-07-10 |
JPWO2015072090A1 (ja) | 2017-03-16 |
US20160187136A1 (en) | 2016-06-30 |
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