Abstract: A system has detection circuitry configured to detect position information on a first point and a second point of a reflective member based on a first primary reflected electromagnetic wave generated by a reflection of a first emitted pulse on the first point and a second primary reflected electromagnetic wave generated by a reflection of a second emitted pulse on the second point, and processing circuitry configured to estimate an angle of inclination of the reflective member relative to a reference surface of the detection circuitry based on the position information on the first point and the second point.

Abstract: A photodetection apparatus according to one embodiment has a photodetection element, first reset circuitry configured to select whether to set on-resistance between a first voltage node and a terminal of the photodetection element to a first value, second reset circuitry configured to select whether to set the on-resistance to a second value smaller than the first value, and control circuitry configured to set the on-resistance to the first value by the first reset circuitry after the photodetection element detects light, and set the on-resistance to the second value by the second reset circuitry after the first reset circuitry select to set the on-resistance to the first value.

Abstract: An electronic apparatus has a light receiver configured to receive a reception light including a reflected pulse provided by a reflection of an emitted pulse on an object, wherein the reception light is received during at least a first time and a second time, and the second time is earlier than the first time, a memory configured to store a digital signal representing a part of information on the reception light received during the second time, and processing circuitry configured to measure a distance to the object based on a difference between emission timing of the emitted pulse and reception timing of the reflected pulse by using the information on the reception light received during the first time and the part of information on the reception light received during the second time.

Abstract: An electronic apparatus capable of determining a distance to an object based on reflected light provided by a reflection of a pulsed light on the object, includes input terminal configured to receive a signal of intensity of reception light. Processing circuitry determines a measurement range capable of specifying a peak of the reception light based on the intensity of the reception light, detects the reflected light by specifying the peak of the reception light within the measurement range, determines, based on the measurement range, a duration from when the pulsed light is emitted until when the reflected light is received, and determines a distance from the electronic apparatus to the object according to the duration.

Abstract: An electronic apparatus capable of determining a distance to an object based on at least first reflected light provided by a reflection of first pulsed light on the object and second reflected light provided by a reflection of a second pulsed light on the object has an input terminal to receive an electrical signal of intensity of reception light, and processing circuitry to specify, based on the electrical signal, a first duration from when the first pulsed light is emitted until when the first reflected light is received within a first measurement range, and determine, based on the first duration, a second measurement range of the second reflected light, specify, a second duration from when the second pulsed light is emitted until when the second reflected light is received within the second measurement range, and determine the distance from the electronic apparatus to the object.

Abstract: An electronic apparatus capable of determining a distance to an object based on reflected light provided by a reflection of pulsed light on the object has detectors configured to detect reception light to measure times from an emission of the pulsed light to detections of the reception light; and processing circuitry configured to determine a duration in which the reflected light is received based on the times, determine, based on one of the times in the duration, a reception timing of the reflected light included in the reception light, and determine the distance from the electronic apparatus to the object according to the reception timing of the reflected light.

Abstract: A semiconductor circuitry includes an oscillator configured to output an oscillation signal whose frequency depends on a first input signal, a counter configured to count a number of cycles of the oscillation signal, first circuitry configured to output a first digital signal based on a first number of cycles counted by the counter within one of a clock cycle of a clock signal, wherein the first input signal is digitally converted into the first digital signal, and a second circuitry configured to output a second digital signal based on a second number of cycles counted by the counter in a period from a reference timing of the clock signal to an input timing of a second input signal within the one of the clock cycle of the clock signal, wherein the period is digitally converted into the second digital signal.

Abstract: According to one embodiment, an electronic apparatus includes a light source, a detector, an equalizer and a processing circuitry. The light source is configured to emit a pulse having a first output value and a first frequency response. The detector is configured to detect a reflected wave of the pulse and convert the reflected wave to a first electric signal. The reflected wave of the pulse is received after the pulse is reflected by an object. The equalizer is configured to equalize the first electric signal using tap coefficients to generate a second electric signal. The tap coefficients are based on at least either one of the first output value and the first frequency response. The processing circuitry is configured to estimate a distance to the object based on the second electric signal.

Abstract: According to one embodiment, an electronic apparatus includes a first avalanche photo diode, a second avalanche photo diode, a first pulse circuit, a second pulse circuit, a first waveform shaping circuit, a second waveform shaping circuit and an adder. The first pulse circuit is configured to shape a signal of the first avalanche photo diode to a first pulse. The second pulse circuit is configured to shape a signal of the second avalanche photo diode to a second pulse. The first waveform shaping circuit is configured to shape the first pulse to a third pulse having a narrower frequency bandwidth than that of the first pulse. The second waveform shaping circuit is configured to shape the second pulse to a fourth pulse having a narrower frequency bandwidth than that of the second pulse. The adder is configured to add the third pulse and the fourth pulse.

Abstract: A receiving circuit includes a first inductor, a second inductor, a capacitor and an amplifier. The first inductor includes a first terminal and a second terminal. The second inductor includes a third terminal and a fourth terminal. The first terminal is configured to couple with an antenna for receiving a first electrical signal corresponding to an electromagnetic wave received by the antenna. The second terminal is configured to output a second electrical signal based on the first electrical signal. The first capacitor includes a fifth terminal coupled to the third terminal and a sixth terminal coupled to the fourth terminal. The amplifier is coupled to the second terminal and configured to amplify the second electrical signal.

Abstract: A receiving circuit includes a first inductor, a second inductor, a capacitor and an amplifier. The first inductor includes a first terminal and a second terminal. The second inductor includes a third terminal and a fourth terminal. The first terminal is configured to couple with an antenna for receiving a first electrical signal corresponding to an electromagnetic wave received by the antenna. The second terminal is configured to output a second electrical signal based on the first electrical signal. The first capacitor includes a fifth terminal coupled to the third terminal and a sixth terminal coupled to the fourth terminal. The amplifier is coupled to the second terminal and configured to amplify the second electrical signal.

Abstract: A time to digital converter has a counter to measure the number of cycles of a first signal, a first phase difference detector to generate a phase difference signal having a pulse width corresponding to a phase difference, a first capacitor to be charged with an electric charge, a second capacitor including capacitance N times the capacitance of the first capacitor, the N being a real number larger than 1, a comparator to compare a charge voltage of the first capacitor and a charge voltage of the second capacitor, a first charge controller to continue to charge the second capacitor until the comparator detects that the charge voltage of the second capacitor has reached the charge voltage of the first capacitor or more, and a first phase difference arithmetic unit to operate the phase difference between the first signal and the second signal.

Abstract: A time to digital converter has a counter, a first phase difference detector, a first capacitor, a second capacitor having capacitance N times a capacitance of the first capacitor, a comparator to compare a charge voltage of the first capacitor with a charge voltage of the second capacitor, a first charge controller, a first phase difference arithmetic unit, a second phase difference detector, a second charge controller, a second phase difference arithmetic unit to operate the phase difference between the first signal and the second signal, and a third phase difference arithmetic unit to detect a fractional phase difference between the first signal and the second signal. The first phase difference arithmetic unit operates the phase difference between the first signal and the second signal, based on a reference phase, when the counter suspends a measurement operation.

Abstract: A radio communication device has an analog control loop unit to generate an analog control signal, a digital control loop unit which has a frequency determined with the frequency of a reference signal and a predetermined frequency setting code signal, a voltage controlled oscillator to generate the voltage control oscillation signal, a data slicer to generate a digital signal obtained by digitally demodulating the reception signal, an automatic offset controller to generate a correction signal, a setting code adjuster to adjust the frequency setting code signal, based on the correction signal, and a direct-current level adjuster to adjust a direct-current level of the digital control signal, based on the correction signal. The data slicer compares the digital control signal adjusted by the direct-current level adjuster, with the threshold value.

Abstract: A time to digital converter has a counter, a first phase difference detector, a first capacitor, a second capacitor having capacitance N times a capacitance of the first capacitor, a comparator to compare a charge voltage of the first capacitor with a charge voltage of the second capacitor, a first charge controller, a first phase difference arithmetic unit, a second phase difference detector, a second charge controller, a second phase difference arithmetic unit to operate the phase difference between the first signal and the second signal, and a third phase difference arithmetic unit to detect a fractional phase difference between the first signal and the second signal. The first phase difference arithmetic unit operates the phase difference between the first signal and the second signal, based on a reference phase, when the counter suspends a measurement operation.

Abstract: A time to digital converter has a counter to measure the number of cycles of a first signal, a first phase difference detector to generate a phase difference signal having a pulse width corresponding to a phase difference, a first capacitor to be charged with an electric charge, a second capacitor including capacitance N times the capacitance of the first capacitor, the N being a real number larger than 1, a comparator to compare a charge voltage of the first capacitor and a charge voltage of the second capacitor, a first charge controller to continue to charge the second capacitor until the comparator detects that the charge voltage of the second capacitor has reached the charge voltage of the first capacitor or more, and a first phase difference arithmetic unit to operate the phase difference between the first signal and the second signal.

Abstract: According to an embodiment, a receiver includes a voltage controlled oscillator, a frequency-to-digital converter and an input sensitivity controller. In the voltage controlled oscillator, input sensitivity relative to a baseband signal is controlled based on an input sensitivity control signal. The voltage controlled oscillator oscillates at a frequency controlled by a voltage of the baseband signal to generate an oscillation signal. The frequency-to-digital converter performs frequency-to-digital conversion of the oscillation signal to generate a digital signal. The input sensitivity controller generates the input sensitivity control signal based on the digital signal.

Abstract: According to an embodiment, an auto frequency control circuit includes a peak time detector, a first time shifter a zero-crossing time detector, and a second time shifter. The peak time detector detects, from the digital signal, a first time at which the digital signal exhibits one of a maximal value and a minimal value. The first time shifter adds or subtracts a first natural number multiple of the predetermined period to or from the first time. The zero-crossing time detector detects, from the digital signal, a second time at which the digital signal exhibits one of a positive zero-crossing and a negative zero-crossing. The second time shifter adds or subtracts the first natural number multiple of the predetermined period to or from the second time.

Abstract: According to an embodiment, an auto frequency control circuit includes a peak time detector, a first time shifter a zero-crossing time detector, and a second time shifter. The peak time detector detects, from the digital signal, a first time at which the digital signal exhibits one of a maximal value and a minimal value. The first time shifter adds or subtracts a first natural number multiple of the predetermined period to or from the first time. The zero-crossing time detector detects, from the digital signal, a second time at which the digital signal exhibits one of a positive zero-crossing and a negative zero-crossing. The second time shifter adds or subtracts the first natural number multiple of the predetermined period to or from the second time.

Abstract: According to an embodiment, a receiver includes a voltage controlled oscillator, a frequency-to--digital converter and an input sensitivity controller. In the voltage controlled oscillator, input sensitivity relative to a baseband signal is controlled based on an input sensitivity control signal. The voltage controlled oscillator oscillates at a frequency controlled by a voltage of the baseband signal to generate an oscillation signal. . The frequency--to-digital converter performs frequency-to-digital conversion of the oscillation signal to generate a digital signal. The input sensitivity controller generates the input sensitivity control signal based on the digital signal.