Abstract: A signal processing circuit includes a first current sensor input, a second current sensor input, a voltage sensor input for receiving a sensor voltage, a first selection unit, a second selection unit, a current analog-digital converter (ADC), a voltage ADC, digital processing block, and a current-voltage converter. The first selection unit includes a first current input coupled to the first current sensor input, and a second current input coupled to the second current sensor input. The second selection unit includes a first voltage input coupled to the voltage sensor input and a second voltage input. The current ADC is coupled to a first current output. The voltage ADC is coupled to a voltage output. The digital processing block is coupled to outputs of the current ADC and the voltage ADC. The current-voltage converter is coupled between a second current output and the second voltage input.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for generating a first light wave by an emitter of the sensor system and detecting a second light wave by a detector of the sensor system. The second light wave is detected in response to the first light wave being reflected from a target object. The sensor system includes a first converter that obtains a first temperature measurement from a temperature sensor of the sensor system at least when the first light wave is generated or when the second light wave is detected. A temperature controller computes temperature coefficients to regulate a temperature of the sensor system. Each of the temperature coefficients are computed based on a difference between the first temperature and a reference temperature. The temperature controller generates a control signal to regulate the temperature of the sensor system based on the computed temperature coefficients.

Abstract: A sensor arrangement for light sensing for light-to-frequency conversion. The sensor arrangement includes a photodiode, an integrator operable to perform an integration phase during an integration time by converting a photocurrent generated by the photodiode into an input voltage, a voltage analog-to-digital converter (ADC) operable to perform a modulation phase by converting the input voltage (VIN) into a digital output signal (ADC_RESULT) which is indicative of the photocurrent generated by the photodiode, a first switch electrically coupled to the photodiode and the integrator input, and a second switch electrically coupled to the input voltage node and a second reference voltage.

Abstract: A multispectral sensor comprises an opaque housing having a first chamber with a first aperture and a separate second chamber with a second aperture. An optical emitter is arranged in the first chamber and is arranged to emit light of a specified wavelength or range of wavelengths through the first aperture. An optical sensor is arranged in the second chamber and arranged to detect received photons through the second aperture. A control unit is configured to initiate emission of light by the optical emitter and a measurement unit is configured to provide sensor signals generated by the optical sensor. The optical sensor comprises an array of sensor pixels of a first type and pixels of a second type. The pixels of the first type each have a different transmission characteristic, each generating a multispectral sensor signal, respectively. The pixels of the second type have a same transmission characteristic and each generate a compensation sensor signal.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for generating a first light wave by an emitter of the sensor system and detecting a second light wave by a detector of the sensor system. The second light wave is detected in response to the first light wave being reflected from a target object. The sensor system includes a first converter that obtains a first temperature measurement from a temperature sensor of the sensor system at least when the first light wave is generated or when the second light wave is detected. A temperature controller computes temperature coefficients to regulate a temperature of the sensor system. Each of the temperature coefficients are computed based on a difference between the first temperature and a reference temperature. The temperature controller generates a control signal to regulate the temperature of the sensor system based on the computed temperature coefficients.

Abstract: A method of processing an analog signal includes receiving, into signal processing circuitry from compensation circuitry, an offset compensation signal, the offset compensation signal having (i) a polarity opposite a polarity of a gain error of the signal processing circuitry and (ii) a magnitude equal to a nominal compensation value plus a deviation. The method includes generating, by the signal processing circuitry, an output signal based on an analog signal received into the signal processing circuitry, including applying the offset compensation signal to an intermediate signal generated by the signal processing circuitry. The method includes scaling the output signal based on the deviation between the magnitude of the offset compensation signal and the nominal compensation value.

Abstract: A multispectral sensor comprises an opaque housing having a first chamber with a first aperture and a separate second chamber with a second aperture. An optical emitter is arranged in the first chamber and is arranged to emit light of a specified wavelength or range of wavelenghts through the first aperture. An optical sensor is arranged in the second chamber and arranged to detect received photons through the second aperture. A control unit is configured to initiate emission of light by the optical emitter and a measurement unit is configured to provide sensor signals generated by the optical sensor. The optical sensor comprises an array of sensor pixels of a first type and pixels of a second type. The pixels of the first type each have a different transmission characteristic, each generating a multispectral sensor signal, respectively. The pixels of the second type have a same transmission characteristic and each generate a compensation sensor signal.

Abstract: A method of processing an analog signal includes receiving, into signal processing circuitry from compensation circuitry, an offset compensation signal, the offset compensation signal having (i) a polarity opposite a polarity of a gain error of the signal processing circuitry and (ii) a magnitude equal to a nominal compensation value plus a deviation. The method includes generating, by the signal processing circuitry, an output signal based on an analog signal received into the signal processing circuitry, including applying the offset compensation signal to an intermediate signal generated by the signal processing circuitry. The method includes scaling the output signal based on the deviation between the magnitude of the offset compensation signal and the nominal compensation value.