Abstract: The object is to simplify the configuration of a filter in a reception apparatus. The reception apparatus includes a filter. The filter provided in the reception apparatus selects a signal transmission characteristic that is one of a band stop characteristic or a low pass characteristic. Further, selection of the signal transmission characteristic in the filter provided in the reception apparatus is performed in response to a desired signal and an interference signal. In the filter provided in the reception apparatus, passage of the desired signal and attenuation of the interference signal based on the selected signal transmission characteristic are executed.

Abstract: The object is to simplify the configuration of a filter in a reception apparatus. The reception apparatus includes a filter. The filter provided in the reception apparatus selects a signal transmission characteristic that is one of a band stop characteristic or a low pass characteristic. Further, selection of the signal transmission characteristic in the filter provided in the reception apparatus is performed in response to a desired signal and an interference signal. In the filter provided in the reception apparatus, passage of the desired signal and attenuation of the interference signal based on the selected signal transmission characteristic are executed.

Abstract: A signal processing device and signal processing method. A plurality of tuner circuits includes at least one that selectively provides a signal from among a plurality of signal bands potentially in an input signal in response to a control signal having a transition between a first state and a second state. A correction circuit corresponds to at least one of the plurality of tuner circuits, and is configured to receive the control signal and provide a corrected control signal for the tuner circuit. The corrected control signal has a gradual transition between the first state and the second state as compared to the transition between the first state and the second state in the control signal.

Abstract: Provided is a receiver apparatus, including: a first receiver configured to receive a first signal having a first frequency band; and a second receiver configured to receive a second signal having a second frequency band, the second frequency band being different from the first frequency band, in which a signal path for the first signal and a signal path for the second signal share at least one component in a signal path for extracting an intermediate-frequency signal from a received signal, the component being configured to extract a signal of a particular channel from the received signal as the intermediate-frequency signal.

Abstract: Provided is a receiver apparatus, including: a first receiver configured to receive a first signal having a first frequency band; and a second receiver configured to receive a second signal having a second frequency band, the second frequency band being different from the first frequency band, in which a signal path for the first signal and a signal path for the second signal share at least one component in a signal path for extracting an intermediate-frequency signal from a received signal, the component being configured to extract a signal of a particular channel from the received signal as the intermediate-frequency signal.

Abstract: A signal processing device and signal processing method. A plurality of tuner circuits includes at least one that selectively provides a signal from among a plurality of signal bands potentially in an input signal in response to a control signal having a transition between a first state and a second state. A correction circuit corresponds to at least one of the plurality of tuner circuits, and is configured to receive the control signal and provide a corrected control signal for the tuner circuit. The corrected control signal has a gradual transition between the first state and the second state as compared to the transition between the first state and the second state in the control signal.

Abstract: In a receiving device, an oscillating section generates a local oscillating signal for performing frequency conversion of one reception target channel of channels in broadcasting in a first frequency band and channels in broadcasting in a second frequency band; a first receiving section generates a channel signal based on the local oscillating signal and a high-frequency signal in the first frequency band when the reception target channel is a channel in the first frequency band, and does not perform the generation when the reception target channel is a channel in the second frequency band; and second receiving section generates a channel signal based on the local oscillating signal and a high-frequency signal in the second frequency band when the reception target channel is a channel in the second frequency band, and does not perform the generation when the reception target channel is a channel in the first frequency band.

Abstract: A signal processing device and signal processing method. A plurality of tuner circuits includes at least one that selectively provides a signal from among a plurality of signal bands potentially in an input signal in response to a control signal having a transition between a first state and a second state. A correction circuit corresponds to at least one of the plurality of tuner circuits, and is configured to receive the control signal and provide a corrected control signal for the tuner circuit. The corrected control signal has a gradual transition between the first state and the second state as compared to the transition between the first state and the second state in the control signal.

Abstract: Disclosed herein is a gain control circuit including: an amplifying section configured to amplify an input voltage in such a manner that amplitude of an output voltage at an output terminal is kept constant; an allowable voltage acquirer configured to acquire an allowable voltage of an apparatus connected to the output terminal; a voltage divider configured to divide the output voltage according to a ratio between a maximum voltage of the amplified input voltage and the allowable voltage; and an adjusting section configured to further amplify the amplified input voltage according to the ratio and supply a resulting voltage to the output terminal.

Abstract: A high-frequency amplifier includes: an amplification section having a function to convert an input signal from a voltage signal into a current signal and output the current signal; output terminals; and a load circuit which is connected to the output node of the amplification section and outputs the current signal output by the amplification section to the output terminals as a voltage signal.

Abstract: An automatic step variable attenuator includes: a step variable attenuator attenuating a received signal of an electric wave signal in an attenuation amount corresponding to a control signal in a step-like style; a detector disposed in parallel with the step variable attenuator for input of the received signal of the electric wave signal, and converting an electric power of the received signal thus inputted into an intensity signal representing an intensity of the received signal; and a comparator portion generating the control signal corresponding to a result of comparison for differences between the intensity signal obtained from the detector and plural threshold values, and outputting the control signal thus generated to the step variable attenuator.

Abstract: In a receiving device, an oscillating section generates a local oscillating signal for performing frequency conversion of one reception target channel of channels in broadcasting in a first frequency band and channels in broadcasting in a second frequency band; a first receiving section generates a channel signal based on the local oscillating signal and a high-frequency signal in the first frequency band when the reception target channel is a channel in the first frequency band, and does not perform the generation when the reception target channel is a channel in the second frequency band; and second receiving section generates a channel signal based on the local oscillating signal and a high-frequency signal in the second frequency band when the reception target channel is a channel in the second frequency band, and does not perform the generation when the reception target channel is a channel in the first frequency band.

Abstract: Disclosed herein is a gain control circuit including: an amplifying section configured to amplify an input voltage in such a manner that amplitude of an output voltage at an output terminal is kept constant; an allowable voltage acquirer configured to acquire an allowable voltage of an apparatus connected to the output terminal; a voltage divider configured to divide the output voltage according to a ratio between a maximum voltage of the amplified input voltage and the allowable voltage; and an adjusting section configured to further amplify the amplified input voltage according to the ratio and supply a resulting voltage to the output terminal.

Abstract: An automatic step variable attenuator includes: a step variable attenuator attenuating a received signal of an electric wave signal in an attenuation amount corresponding to a control signal in a step-like style; a detector disposed in parallel with the step variable attenuator for input of the received signal of the electric wave signal, and converting an electric power of the received signal thus inputted into an intensity signal representing an intensity of the received signal; and a comparator portion generating the control signal corresponding to a result of comparison for differences between the intensity signal obtained from the detector and plural threshold values, and outputting the control signal thus generated to the step variable attenuator.

Abstract: A high-frequency amplifier includes: an amplification section having a function to convert an input signal from a voltage signal into a current signal and output the current signal; output terminals; and a load circuit which is connected to the output node of the amplification section and outputs the current signal output by the amplification section to the output terminals as a voltage signal.

Abstract: A signal processing device and signal processing method. A plurality of tuner circuits includes at least one that selectively provides a signal from among a plurality of signal bands potentially in an input signal in response to a control signal having a transition between a first state and a second state. A correction circuit corresponds to at least one of the plurality of tuner circuits, and is configured to receive the control signal and provide a corrected control signal for the tuner circuit. The corrected control signal has a gradual transition between the first state and the second state as compared to the transition between the first state and the second state in the control signal.

Abstract: A bias-voltage supply circuit of a radio-frequency amplification circuit has the constant-voltage power supply generating a constant voltage higher than the bias voltage, a rectifier transistor and a constant-current power supply supplying a constant current to the rectifier transistor. The rectifier transistor is connected between a supply point of a bias voltage connected to an input terminal of the radio-frequency amplification transistor via an element for bias supply and a power supply voltage supply line, wherein a control terminal is kept by the constant voltage that the constant-voltage power supply generates. Since descent of the electric potential of the input terminal of a radio-frequency signal does not arise because of circuit composition, the radio-frequency amplification circuit has a good saturation characteristic.

Abstract: A high performance power detection circuit suitable to be made monolithic, being compact and low at cost, suitable to a radio-frequency operation in a wide band, having excellent linearity in detection characteristics, small fluctuation of detection characteristics against bias fluctuation, small fluctuation of detection characteristics against FET threshold voltage fluctuation and a small DC offset, which does not require an additional circuit even when a subsequent circuit has a balanced input; and a demodulator using the same.

Abstract: The present invention relates to an I/Q demodulator (21) comprising a n-port structure (1,16) is provided, wherein n is an integer value of 4,5 or 6. The demodulator (21) is supplied at a first input (3) with a RF signal (2) which has to be demodulated. At a second input (5) it is supplied with a second RF signal (4). The n?2 output signals (6) are detected by power sensors (7). After low pass filtering (14) the output signals of the power sensors (7) are multiplexed by a multiplexing means (8).

Abstract: The present invention relates to a method and a device for the I/Q demodulation of modulated RF signals. The I/Q demodulator (60) has a first input for the RF signal (61) to be demodulated and a second input for a RF signal (62) originating from a local oscillator (20). The demodulator (60) combines the two RF signals (61,62) to generate three output signals supplied to three power detectors. In a combination unit (70) the three power signals of the power detectors are merged in two signal branches wherein after passing an A/D converting (72) and digital processing unit (73) one signal is the I component and the other one is the Q component of the received modulated RF signal (61).