Abstract: A suppression of a rise in temperature is to be attained for a light source apparatus provided with an emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed. A light source apparatus according to the present technology includes an emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed, and a driving section configured to cause the plurality of light-emitting elements of the emission section to emit light, in which at least a portion of a region including driving elements in the driving section is disposed so as not to overlap with the emission section.

Abstract: A light source device that includes a first resistor that is connected to a given potential, a light emitting element that is connected in series to the first resistor, a second resistor that is connected to the given potential, and a first current source that is connected in series to the second resistor and that is configured to supply a freely-selected current within a given range are included. A first voltage is taken out from a first connection part where the first resistor and the light emitting element are connected to each other and a second voltage is taken out from a second connection part where the second resistor and the first current source are connected to each other.

Abstract: A light source device according to an embodiment includes: a first resistor (101) that is connected to a given potential; a light emitting element (12) that is connected in series to the first resistor; a second resistor (102) that is connected to the given potential; and a first current source (104) that is connected in series to the second resistor and that is configured to supply a freely-selected current within a given range are included. A first voltage is taken out from a first connection part where the first resistor and the light emitting element are connected to each other and a second voltage is taken out from a second connection part where the second resistor and the first current source are connected to each other.

Abstract: A light source device according to an embodiment includes: a first resistor (101) that is connected to a given potential; a light emitting element (12) that is connected in series to the first resistor and that is configured to be supplied with a given current and thus emit a given amount of light; a second resistor (102) that is connected to the given potential; and a first current source (104) that is connected in series to the second resistor and that is configured to supply a current obtained by adding a current corresponding to an overcurrent to the given current are included, and a first voltage at a first connection part where the first resistor and the light emitting element are connected to each other and a second voltage at a second connection part where the second resistor and the first current source are connected to each other are taken out.

Abstract: A suppression of a rise in temperature is to be attained for a light source apparatus provided with an emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed. A light source apparatus according to the present technology includes an emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed, and a driving section configured to cause the plurality of light-emitting elements of the emission section to emit light, in which at least a portion of a region including driving elements in the driving section is disposed so as not to overlap with the emission section.

Abstract: A semiconductor integrated circuit for broadcast receivers, which integrates an RF circuit, a mixer, an IF circuit, and an intermediate-frequency signal processing circuit onto a single chip, additionally includes a second RF circuit whose input terminal is grounded through an impedance equivalent to or almost the same as the output impedance of an antenna circuit, and a second mixer downstream of the second RF circuit. The second RF circuit and the second mixer each has an input impedance equivalent to that of the received signal subsystem; therefore, a spurious component equivalent to the spurious component contained in the output signal of the received signal subsystem is detected in the second RF circuit and in the second mixer, and cancels out the spurious component contained in the output signal of the received signal subsystem. Accordingly, the effects of noise due to spurious can be effectively reduced.

Abstract: A receiver includes an RF unit, a mixer which converts the output of the RF unit, a signal processing unit which filters the converted signal, a demodulator which demodulates the filtered signal, a level detector which compares a level of one of signals present between an input of the RF unit and an output of the signal processing unit with a threshold, a gain controller which generates a gain control signal based on the comparison result, a gate signal generator, and an interpolator. The receiver is configured such that a gain from the input of the RF unit to the output of the signal processing unit is changed in a stepwise manner. The gate signal generator generates a gate signal in synchronism with the gain change. The interpolator holds or interpolates the output of the demodulator for the time period represented by the gate signal.

Abstract: An automatic gain control device includes amplifiers cascaded, each having a variable gain; level measurement portions respectively corresponding to the amplifiers, where each of the level measurement portions measures a level of an output signal of a corresponding one of the amplifiers in a level measurement period indicated by a level measurement signal; error calculators respectively corresponding to the level measurement portions, where each of the error calculators compares a level measured by a corresponding one of the level measurement portions with a threshold which is set so that a corresponding one of the amplifiers will not saturate, and outputs a comparison result as an error signal; a gain computation section which updates one of the gains of the amplifiers at a time corresponding to a gain update signal, based on the error signals; and an operation controller which generates the level measurement signal and the gain update signal.

Abstract: An automatic gain control device includes an amplifier which amplifies an input signal based on a gain control signal, and outputs an amplified signal, a converter which converts the amplified signal into a converted signal having a value corresponding to an absolute value of the amplified signal, a peak detector which removes, during a peak detection period, from values of the converted signal, a predetermined number of values which include a maximum value, and determines a peak level of the converted signal after the removing, an error calculator which calculates an error between the peak level and a reference signal, and outputs the error as an error signal, and a gain controller which updates the gain control signal based on the error signal, and outputs an updated gain control signal.

Abstract: A semiconductor integrated circuit for broadcast receivers, which integrates an RF circuit, a mixer, an IF circuit, and an intermediate-frequency signal processing circuit onto a single chip, additionally includes a second RF circuit whose input terminal is grounded through an impedance equivalent to or almost the same as the output impedance of an antenna circuit, and a second mixer downstream of the second RF circuit. The second RF circuit and the second mixer each has an input impedance equivalent to that of the received signal subsystem; therefore, a spurious component equivalent to the spurious component contained in the output signal of the received signal subsystem is detected in the second RF circuit and in the second mixer, and cancels out the spurious component contained in the output signal of the received signal subsystem. Accordingly, the effects of noise due to spurious can be effectively reduced.

Abstract: A VCO circuit includes a temperature detector circuit, a voltage generator circuit, a switch, a resonance circuit and an oscillator. The temperature detector detects a temperature, and the voltage generator circuit generates a voltage for coarse adjustment corresponding to the detected temperature and outputs the same voltage. The switch selects one of a DC voltage for fine adjustment and the voltage for coarse adjustment. The resonance circuit includes a varactor diode having a capacitance value adjusted based on the voltage selected by the switch, capacitors and an inductor, and has a predetermined resonance frequency. The oscillator generates an oscillation signal having an oscillation frequency corresponding to the resonance frequency by using the resonance circuit and outputs the same signal.

Abstract: A constant voltage source supplies a bias current to a wireless receiver circuit. A bias current detector circuit detects the bias current, and outputs a detection result to a current controller circuit. The current controller circuit outputs the detection result of the bias current to a memory circuit. The current controller circuit controls the bias current detector circuit to stop operating thereof, and then controls the bias current to decrease when the detected bias current is larger than a predetermined first threshold value and controls the bias current to increase when the detected bias current is smaller than a second threshold value smaller than the first threshold value, based on the detection result stored in the memory circuit.

Abstract: A communication control circuit includes a shift register and a control data selector, and controls controlled units according to a data signal, a clock signal and a strobe signal inputted via three serial signal lines. The shift register serial-to-parallel converts the data signal sequentially taken in according to the clock signal into a converted signal, and outputs the converted signal. The control data selector selects control data for controlling the corresponding controlled unit from the signal from the shift register, in response to a device definition signal for identifying the communication control circuit, and outputs the same control data.

Abstract: A semiconductor integrated circuit for use in a receiver can reduce fluctuations in characteristics caused by fluctuations in current to thereby reduce dissipation power. A bias current detection circuit and a current control circuit are provided to decrease a current of a high-frequency circuit if a bias current is large and, if the bias current is small, increase the current of the high-frequency circuit, so as to prevent characteristics of the high-frequency circuit from deteriorating and to reduce the current, thereby enabling reducing dissipation power.

Abstract: A semiconductor integrated circuit for use in a receiver can reduce fluctuations in characteristics caused by fluctuations in current to thereby reduce dissipation power. A bias current detection circuit and a current control circuit are provided to decrease a current of a high-frequency circuit if a bias current is large and, if the bias current is small, increase the current of the high-frequency circuit, so as to prevent characteristics of the high-frequency circuit from deteriorating and to reduce the current, thereby enabling reducing dissipation power.

Abstract: A VCO circuit includes a temperature detector circuit, a voltage generator circuit, a switch, a resonance circuit and an oscillator. The temperature detector detects a temperature, and the voltage generator circuit generates a voltage for coarse adjustment corresponding to the detected temperature and outputs the same voltage. The switch selects one of a DC voltage for fine adjustment and the voltage for coarse adjustment. The resonance circuit includes a varactor diode having a capacitance value adjusted based on the voltage selected by the switch, capacitors and an inductor, and has a predetermined resonance frequency. The oscillator generates an oscillation signal having an oscillation frequency corresponding to the resonance frequency by using the resonance circuit and outputs the same signal.

Abstract: A variable gain amplifier of the present invention connects an input and an output of a first variable gain amplifier circuit to an RF input terminal and an RF output terminal, respectively, connects one terminal of an attenuation circuit is to an RF input terminal, connects an input and an output of a second variable gain amplifier circuit to the other terminal of the attenuation circuit and an RF output terminal, respectively, connects one terminal of the variable resistance circuit to a node between the attenuation circuit and the second variable gain amplifier circuit, and grounds the other terminal of the variable resistance circuit. A gain of the first variable gain amplifier circuit, a gain of the second variable gain amplifier circuit, and a resistance value of the variable resistance circuit are then varied by a gain control voltage outputted from a gain control section.

Abstract: A filtering apparatus includes a main filter, a variation detection circuit, and a variation correction circuit. The variation detection circuit includes a reference filter having at least one resistor and at least one capacitor, detects a variation of CR-product based on the resistor and the capacitor of the reference filter in response to each of a plurality of reference signals having different frequencies from each other, and then outputs a variation detection signal indicating a detected result. The variation correction circuit corrects frequency characteristics of the main filter on the basis of the variation detection signal.

Abstract: A constant voltage source supplies a bias current to a wireless receiver circuit. A bias current detector circuit detects the bias current, and outputs a detection result to a current controller circuit. The current controller circuit outputs the detection result of the bias current to a memory circuit. The current controller circuit controls the bias current detector circuit to stop operating thereof, and then controls the bias current to decrease when the detected bias current is larger than a predetermined first threshold value and controls the bias current to increase when the detected bias current is smaller than a second threshold value smaller than the first threshold value, based on the detection result stored in the memory circuit.

Abstract: A filtering apparatus includes a main filter, a variation detection circuit, and a variation correction circuit. The variation detection circuit includes a reference filter having at least one resistor and at least one capacitor, detects a variation of CR-product based on the resistor and the capacitor of the reference filter in response to each of a plurality of reference signals having different frequencies from each other, and then outputs a variation detection signal indicating a detected result. The variation correction circuit corrects frequency characteristics of the main filter on the basis of the variation detection signal.