# US 9,939,290 B1 · Method for calibration of a system with time-multiplexed sensors

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- Number: US 9,939,290 B1
- Document ID: US9939290B1
- Status: Granted
- Kind: B1
- Application number: 14/685,139
- Filed: 2015-04-13
- Granted: 2018-04-10
- Earliest claimed: 2013-09-16
- Assignees: Panasonic Corporation
- Applicants: Panasonic Corporation
- Inventors: Saroj J. Rout; Akhil K. Garlapati; Qicheng Yu
- Web page: https://patentgrep.com/patent/US9939290B1

## CPC

- G01D 3/032: affecting incoming signal, e.g. by averaging; gating undesired signals
- G01C 19/5726: Signal processing
- G01C 19/5776: Signal processing not specific to any of the devices covered by groups G01C19/5607 - G01C19/5719
- G01C 25/005: {initial alignment, calibration or starting-up of inertial devices}
- G01P 21/00: Testing or calibrating of apparatus or devices covered by the preceding groups
- H04Q 9/00: Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
- H04Q 11/04: for time-division multiplexing {(H04Q11/0001 takes precedence)}
- G01P 15/18: in two or more dimensions
- H04Q 2213/13213: Counting, timing circuits
- H04Q 2213/13292: Time division multiplexing, TDM
- H04Q 2213/13305: Transistors, semiconductors in general
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S)
- G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G})
- H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W)

## Abstract

A sense channel signal processing block is time-domain multiplexed among multiple MEMS devices and utilizes an anti-aliasing filter disposed after track-and-hold switches, to prevent the bandwidth of the sense channel from being limited by the anti-aliasing filter. A multiplexed signal processor architecture performs dynamic calibration of all sensor error signals in response to environmental changes.

## Claims

### Claim 1

A sense channel apparatus comprising:
a) a plurality of input switches for receiving analog signals from a plurality of MEMS devices, respectively;
b) a plurality of output switches;
c) a zero-IF mixer operatively coupled intermediate the plurality of input switches and the plurality of output switches;
d) a common signal processing module operatively coupled intermediate the zero-IF mixer and the plurality of output switches, the signal processing module configured to at least partially derive a parameter signal from an analog signal from one of the plurality of MEMS devices; and
e) a calibration module configured to generate a calibration signal at least partially derived from the parameter signal associated with one of the plurality of MEMS devices and further configured to provide the generated calibration signal to one of the plurality of MEMS devices in a multiplexed, time domain manner, wherein calibration signals are generated for the plurality of MEMS devices, respectively.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the zero-IF mixer has a trans-impedance amplifier.

### Claim 3 (depends on 2)

The apparatus of claim 2 wherein at least one of the MEMS devices comprises a gyroscope.

### Claim 4 (depends on 1)

The apparatus of claim 1 further comprising a timing generator module for providing timing signals to the signal processing module and the calibration module.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the calibration signal is updated to a particular MEMS device of the plurality of the MEMS devices during a phase when an output of the particular MEMS device is inactive.