Patent application number | Description | Published |
20090009155 | Discrete Time Direct Sampling Circuit and Receiver - A direct sampling circuit and a receiver which carry out discrete time analog processing with a high degree of design freedom and are provided with a filter property which is achievable to comply with the receipt of a broad band signal. A plurality of discrete time analog processing circuits ( | 01-08-2009 |
20090011720 | Bidirectional Frequency Converter and Radio Equipment Using Same - When a power supply switch is turned on and an RF signal and an LO signal are input to a bipolar transistor, a mixed signal of both signals is output as an IF signal. When the power supply switch is turned off, the bipolar transistor operates as two diodes connected between a base terminal and an emitter terminal and between the base terminal and a collector terminal. When the IF signal and the LO signal are input, the input signals are mixed with each other by the diodes and the RF signal is output. Accordingly, one frequency conversion has a plus conversion gain and when bidirectional frequency conversion is performed by the use of one frequency converter, an external circuit such as a signal path switching switch is not necessary. | 01-08-2009 |
20090023402 | POLAR MODULATION CIRCUIT, INTEGRATED CIRCUIT AND RADIO APPARATUS - An object of the invention is to provide a polar modulation circuit capable of reducing the capacity of data stored in memory and suppressing an increase in the circuit scale related to distortion compensation while assuring the compensation accuracy. The polar modulation circuit according to the invention stores output signal characteristic relative to the control voltage at the steady state after input of the control voltage for a predetermined input amplitude of an input high frequency signal as the basis of distortion compensation of an amplifier separately into an offset storage section | 01-22-2009 |
20090080571 | RECEPTION APPARATUS AND RECEPTION METHOD - A receiving apparatus includes an amplification section that amplifies a received signal and a frequency conversion section that converts a frequency of the received signal, from a radio frequency to a baseband, the baseband having a lower frequency than the radio frequency. A gain control section amplifies, by a predetermined gain, the signal that has been subjected to the frequency conversion to the baseband. A voltage calibration section performs calibration on an offset voltage generated in the signal subjected to frequency conversion to the baseband. A time constant control section sets a first time constant during a reception operation and sets a second time constant, which is reduced with respect to the first time constant, during the calibration. A filter section passes a received signal of a predetermined band, with the first time constant or the second time constant, an operation control section stops operation of the amplification section during the calibration, controls the amplification section to operate during the reception operation, and controls the operation of the amplification section so as to reduce a residual offset voltage caused by switching the operation of the amplification section. | 03-26-2009 |
20090108952 | DISTORTION COMPENSATING CIRCUIT - A distortion compensating circuit is provided in which, in the polar modulation system, while suppressing increase of compensation data and increase of the circuit scale, a modulated signal can be correctly expressed, or low-distortion characteristics of a power amplifier can be realized. Based on a steady characteristic compensating circuit | 04-30-2009 |
20090257531 | SAMPLING FILTER APPARATUS AND WIRELESS COMMUNICATION APPARATUS - The present invention has an object to provide a sampling filter apparatus and a wireless communication apparatus, which are capable of changing a filter characteristic without employing complex waveforms as control signals, and also, capable of performing filtering process operations without performing a decimation, while utilizing a wide frequency space. A sampling filter apparatus | 10-15-2009 |
20090295436 | ELECTRONIC CIRCUIT, FREQUENCY DIVIDER AND RADIO SET - A master stage | 12-03-2009 |
20100093302 | Discrete Time Direct Sampling Circuit and Receiver - Provided are a direct sampling circuit and a receiver using a discrete time analog process and having a filter effect of a steep attenuation characteristic in a narrow-pass band without lowering a sampling rate. In a discrete time direct sampling circuit ( | 04-15-2010 |
20100109746 | SAMPLING MIXER, FILTER DEVICE, AND RADIO DEVICE - A sampling mixer includes TAs (transconductance amplifiers), an in-phase mixer section connected to the TA and the TA, an opposite-phase mixer section connected in parallel with the in-phase mixer section, and a signal generator for generating a control signal for the in-phase mixer section and the opposite-phase mixer section respectively. The IIR filter using signals that underwent a current conversion by using the different transconductances is constructed, so that the filter characteristic can be designed by a weighting of the transconductance in addition to a capacitance ratio. As a result, the wide-band filter characteristic and the band-pass filter characteristic can be obtained, and deterioration of the receiving sensitivity can be suppressed by designing the filter characteristic suitable for the radio communication system. | 05-06-2010 |
20100182077 | DISCRETE FILTER, SAMPLING MIXER AND WIRELESS DEVICE - A sampling filter of such circuitry as not requiring a high frequency REF signal even if the number of decimation is decreased. In the sampling filter, the rotate capacitor in each switched capacitor circuit including Cr ( | 07-22-2010 |
20100201424 | SAMPLING FILTER APPARATUS - The sampling filter apparatus | 08-12-2010 |
20100248675 | DISCRETE FILTER, SAMPLING MIXER, AND RADIO DEVICE - Provided is a discrete filter capable of increasing degree of freedom of design including a DC gain. A sampling mixer ( | 09-30-2010 |
20100260077 | RADIO CIRCUIT DEVICE - A radio circuit device capable of reducing a cross-modulation interference which occurs at a reception circuit due to a transmission signal leakage is provided. | 10-14-2010 |
20100267351 | RECEIVER AND GAIN CONTROL METHOD - A receiver capable of performing optimum automatic gain control responsive to a peak factor of an input signal before subjected to A/D conversion is provided in a simple configuration. A peak detector | 10-21-2010 |
20100279631 | BIDIRECTIONAL FREQUENCY CONVERTER AND RADIO EQUIPMENT USING SAME - When a power supply switch is turned on and an RF signal and an LO signal are input to a bipolar transistor, a mixed signal of both signals is output as an IF signal. When the power supply switch is turned off, the bipolar transistor operates as two diodes connected between a base terminal and an emitter terminal and between the base terminal and a collector terminal. When the IF signal and the LO signal are input, the input signals are mixed with each other by the diodes and the RF signal is output. Accordingly, one frequency conversion is performed by the use of one frequency converter, an external circuit such as a signal path switching switch is not necessary. | 11-04-2010 |
20100321114 | AMPLIFIER CIRCUIT AND RECEIVER USING THE SAME - An amplifier circuit includes a variable gain amplifier that amplifies and outputs a signal from an output port, a controller operable to change an gain of the variable gain amplifier, a mixer that mixes the signal output from the output port of the variable gain amplifier with a local oscillating signal to heterodyne the signal and outputs the heterodyned signal, a filter that outputs a signal component having a predetermined frequency out of the signal output from the mixer, and a detector that detects a power level based on power of the signal output from the filter. The controller is operable to change the gain according to the first power level such that a quality level representing quality of the signal output from the filter becomes a target quality level immediately after the gain is changed. The amplifier circuit can have small power consumption. | 12-23-2010 |
20110013736 | SAMPLING FILTER DEVICE - A sampling filter device wherein the filter characteristic is variable without using a control signal of a complicated waveform is provided. A sampling filter device | 01-20-2011 |
20110176640 | SAMPLING CIRCUIT AND RECEIVER UTILIZING THE SAME - Disclosed are a sampling circuit and a receiver that have a high level of filter design flexibility and excellent image rejection characteristics. Signals with phases that differ by 90° are sampled using an IQ generating circuit ( | 07-21-2011 |
20110199122 | DIRECT SAMPLING CIRCUIT AND RECEIVER - A sampling circuit and a receiver with relatively simple configuration and clocks, exhibiting excellent frequency characteristics, are provided. In discrete time circuits ( | 08-18-2011 |
20110221507 | SAMPLING MIXER, FILTER DEVICE, AND RADIO DEVICE - A sampling mixer includes TAs (transconductance amplifiers), an in-phase mixer section connected to the TA and the TA, an opposite-phase mixer section connected in parallel with the in-phase mixer section, and a signal generator for generating a control signal for the in-phase mixer section and the opposite-phase mixer section respectively. The IIR filter using signals that underwent a current conversion by using the different transconductances is constructed, so that the filter characteristic can be designed by a weighting of the transconductance in addition to a capacitance ratio. As a result, the wide-band filter characteristic and the band-pass filter characteristic can be obtained, and deterioration of the receiving sensitivity can be suppressed by designing the filter characteristic suitable for the radio communication system. | 09-15-2011 |
20120002768 | DISTORTION-CORRECTING RECEIVER AND DISTORTION CORRECTION METHOD - Disclosed are a distortion-correcting receiver and a distortion correction method capable of precisely cancelling inter-modulation secondary distortion even when an input signal is markedly band-limited in a reception processing unit. In the distortion-correcting receiver ( | 01-05-2012 |
20120086504 | NONLINEAR DISTORTION COMPENSATING RECEIVER AND NONLINEAR DISTORTION COMPENSATION METHOD - Disclosed are a nonlinear distortion compensating receiver and nonlinear distortion compensation method, wherein nonlinear distortion is reduced with a simple circuit configuration. A correction (opposite characteristics) filter ( | 04-12-2012 |
20120230452 | WIRELESS RECEIVING APPARATUS - Disclosed is a wireless receiving apparatus, whereby inter-antenna interference can be reduced without inducing an increase of a mounting area due to an increase of the number of antennas, and the number of RFIC input terminals, circuit scale and power consumption can be reduced. In the wireless receiving apparatus ( | 09-13-2012 |
20130130740 | WIRELESS COMMUNICATION APPARATUS - A wireless communication apparatus compatible with a plurality of communication schemes includes a first communicator that performs a communication in a first communication scheme, a second communicator that performs a communication in a second communication scheme, a signal generator that generates a signal for commanding startup of a communicator of the wireless communication terminal which performs a communication in the second communication scheme when the reception quality in the first communication scheme is equal to or higher than a threshold value, provided that the first communicator is in a state of communicable with the wireless communication terminal and that the communicator of the wireless communication terminal is not started, and a threshold value setting section that sets the threshold value based on information indicating the reception qualities in the first and second communication schemes. | 05-23-2013 |
20140091848 | DIRECT SAMPLING CIRCUIT AND RECEIVER - A sampling circuit is provided that includes a first sampling circuit that shifts a frequency, at which a gain of a frequency characteristic is maximized, to a lower frequency side, and a second sampling circuit that shifts the frequency, at which the gain of the frequency characteristic is maximized, to a higher frequency side. The sampling circuit also includes an output section provided in an output side of the first sampling circuit and an output side of the second sampling circuit, and outputs a sum or a difference between an output from the first sampling circuit and an output from the second sampling circuit. | 04-03-2014 |
20150056935 | CURRENT OUTPUT CIRCUIT AND WIRELESS COMMUNICATION APPARATUS - A current output circuit includes a current mirror circuit that has first and second transistors in each of which a source is connected to a reference voltage, and that outputs a current which is proportional to a drain current of the first transistor, from a drain of the second transistor; a switch that turns ON/OFF the current output of the current mirror circuit; a third transistor in which a gate is connected to a gate of the second transistor; and a bias circuit that applies a first voltage to a drain of the third transistor. The bias circuit switches the first voltage to two different voltages in synchronization with opening/closing of the switch. | 02-26-2015 |
20150071394 | WIRELESS COMMUNICATION DEVICE AND ACTIVATION METHOD OF THE WIRELESS COMMUNICATION DEVICE - A wireless communication device includes a BBIC for performing baseband signal processing, an RFIC for performing radio-frequency signal processing, and a quartz resonator. The RFIC has a storage unit which stores an adjustment value for adjustment of a clock frequency that is based on an oscillation frequency of the quartz resonator, and outputs the adjustment value when its resetting active state is canceled; a frequency adjusting unit for adjusting the clock frequency according to the adjustment value; and an RF signal processing unit which operates based on the clock signal and performs the radio-frequency signal processing. | 03-12-2015 |