Patent application number | Description | Published |
20100023826 | CLOCK DATA RECOVERING CIRCUIT AND CONTROL METHOD OF THE CLOCK DATA RECOVERING CIRCUIT - A clock data recovering circuit solving a problem in which a stable clock signal cannot be extracted is provided. A phase comparator includes a main-signal-discriminator. The main-signal-discriminator discriminates a reception signal by a clock signal to generate recovery data indicating the discrimination result. Phase comparator | 01-28-2010 |
20110156759 | SAMPLE AND HOLD CIRCUIT AND METHOD FOR CONTROLLING THE SAME - A sample and hold circuit comprises an input stage amplifier circuit for amplifying an input signal and a hold circuit for holding an output signal of the input stage amplifier circuit, with a sampling clock signal as a trigger, is further provided with a bias current switching circuit for switching a bias current of the input stage amplifier circuit to another circuit that is functionally independent of the sample and hold circuit, in a case where the hold circuit is in a hold period, to supply the bias current to the circuit. | 06-30-2011 |
20110163899 | SAMPLE AND HOLD CIRCUIT AND METHOD FOR CONTROLLING SAME - A sample and hold circuit that is provided with an input stage amplifier circuit for amplifying an input signal and a hold circuit for holding an output signal of the input stage amplifier circuit, with a sampling clock signal as a trigger, is further provided with a hold circuit bias current switching circuit for switching a bias current of the hold circuit to a first separate circuit that is functionally independent of the sample and hold circuit, in a case where the hold circuit is in a hold period, to supply the bias current to the circuit. | 07-07-2011 |
20110204927 | ELECTRONIC CIRCUIT SYSTEM, TRACK HOLD CIRCUIT MODULE, ELECTRONIC CIRCUIT OPERATION CONTROL METHOD, AND PROGRAM THEREOF - Provided is an electronic circuit system which facilitates skew timing adjustment while preventing increase of power consumption. An electronic circuit system includes: a track hold circuit module formed by a hierarchical tree structure of track hold circuits which can track-hold an analog value of an analog signal; and a control signal generation module which supplies an operation control signal to each of the track hold circuits in the hierarchical tree structure. In the hierarchical tree structure, the number of track hold circuits of each of the hierarchies is stepwise changed from the first hierarchy of the input side to which an analog signal is inputted, toward the final hierarchy of the final output side as the number of hierarchies is increased. | 08-25-2011 |
20120020677 | RECEIVING DEVICE AND DEMODULATION DEVICE - To adequately perform sampling, a receiving device that solves problems that involve an increase in circuit area and an increase in cost, is provided. | 01-26-2012 |
20120112937 | ANALOG-TO-DIGITAL CONVERSION DEVICE AND ANALOG-TO-DIGITAL CONVERSION METHOD - An analog-to-digital conversion device which converts an analog input signal into a digital signal and output it includes a signal characteristic detection unit for detecting a predetermined characteristic of the input signal; a control signal generation unit for setting a resolution based on the signal characteristic detected by the signal characteristic detection unit, generating a control signal that indicates only an operation required for performing the analog-to-digital conversion at the resolution, and outputting it; and an analog-to-digital conversion unit for restricting the operation based on the control signal and converting the input signal into the digital signal at the set resolution. | 05-10-2012 |
20120242520 | A/D CONVERSION DEVICE AND COMPENSATION CONTROL METHOD FOR A/D CONVERSION DEVICE - An A/D conversion apparatus includes first to M-th ADC connected in parallel converting an analog input signal to digital signals in response to M-phase sampling signals, a reference A/D conversion circuit that converts the analog input signal to a digital signal in response to a divided-by-(n×Mf+1) sampling signal; and a control unit that compares, for each period of (n×M+1) clock cycles, one of the digital signals from a corresponding one of first to M-th ADC with the digital signal from the reference ADC in a predetermined order of the first to M-th ADC, and generates a compensation control signal based on the comparison result for supply to the corresponding ADC. | 09-27-2012 |
20120280844 | DIGITAL RECEIVER AND OPTICAL COMMUNICATION SYSTEM THAT USES SAME - A digital receiver includes: an analog-to-digital (AD) converter ( | 11-08-2012 |
20120286986 | A/D CONVERSION CIRCUIT - Each of cascade-connected one-bit A/D converters includes first and second amplifier circuits receiving first and second input signals, a third amplifier circuit that outputs an interpolation value of outputs of the first and second amplifier circuits, a comparator that outputs a binary signal having value determined by a polarity of an output of the third amplifier circuit, and a selector that selects two of three outputs of the first to third amplifier circuits, based on a value of the comparator. The selector is set such that direct-current transfer characteristics of two outputs of the selector are folded and symmetrical relative to the midpoint of the first and second input signals. | 11-15-2012 |
20130027234 | TIME-INTERLEAVED A/D CONVERTER APPARATUS - A time-interleaved A/D converter apparatus has a primary signal A/D converter circuit group that is time-interleaved with a combination of N A/D converter circuits, a correction signal generation part operable to receive the input analog signal and a 1/m-sampling signal having a speed that is 1/m of a rate of the sampling signal inputted to the primary signal A/D converter circuit group, to extract a dispersion of a transmission line that is immanent in the input analog signal, and to output the dispersion as a dispersion compensation control signal used for digital signal compensation, and a signal processing part operable to convert the N digital signals into one digital signal based upon the dispersion compensation control signal and to compensate a dispersion included in the converted digital signal. | 01-31-2013 |
20130027236 | A/D CONVERSION DEVICE AND A/D CONVERSION CORRECTING METHOD - An A/D conversion unit performs an A/D conversion operation twice during a hold period of an analog value. In a first conversion operation, the A/D conversion unit compares the analog value with a first reference voltage and outputs a comparison result as first converted data. In a second conversion operation, the A/D conversion unit compares the analog value with a second reference voltage and outputs a comparison result as second converted data. The second reference voltage is a voltage obtained by adding or subtracting a minimum resolution voltage to or from the first reference voltage. A digital processing unit averages errors of the first and second converted data by digital processing to detect an A/D conversion error, and feeds back a detection result to the A/D conversion unit as a control value to perform voltage control. | 01-31-2013 |
20130176609 | OPTICAL PHASE MODULATION CIRCUIT AND OPTICAL PHASE MODULATION METHOD - To provide an optical phase modulation circuit and an optical phase modulation method capable of achieving a high-speed operation without increasing the power consumption. An optical phase modulation circuit according to the present invention includes an optical modulation unit | 07-11-2013 |
20130307587 | SAMPLE AND HOLD CIRCUIT AND METHOD FOR CONTROLLING THE SAME - A sample and hold circuit comprises an input stage amplifier circuit for amplifying an input signal and a hold circuit for holding an output signal of the input stage amplifier circuit, with a sampling clock signal as a trigger, is further provided with a bias current switching circuit for switching a bias current of the input stage amplifier circuit to another circuit that is functionally independent of the sample and hold circuit, in a case where the hold circuit is in a hold period, to supply the bias current to the circuit. | 11-21-2013 |
20140232577 | ANALOG-TO-DIGITAL CONVERTER AND ANALOG-TO-DIGITAL CONVERSION METHOD - An analog-to-digital converter according to the present invention includes first and second analog-to-digital conversion cells ( | 08-21-2014 |
20150063819 | OPTICAL TRANSMITTER, OPTICAL TRANSMISSION/RECEPTION SYSTEM, AND DRIVE CIRCUIT - The present invention provides an optical transmitter, an optical transmission/reception system, and a drive circuit, which are capable of adjusting linearity of signal intensity of output light. The optical transmitter includes an optical transmission lines through which an optical signal propagates, phase modulation regions being formed on the optical transmission line. A decoder decodes an input digital signal and outputs signals according to a decoded value. A drive circuit outputs drive signals level of which is equal to or more than three to the each of the plurality of phase modulation regions based on the signals. A control circuit adjusts full-scale amplitude of each of the drive signals by controlling the drive circuit. | 03-05-2015 |
20150063822 | OPTICAL TRANSMITTER, OPTICAL TRANSMISSION/RECEPTION SYSTEM, AND DRIVE CIRCUIT - An optical modulator includes optical waveguides on which phase modulation regions are formed. A drive circuit includes a lower-bit drive unit, an upper-bit drive unit, and a bit splitting unit. The bit splitting unit splits an input digital signal into upper bits and lower bits. The lower-bit drive unit outputs a value obtained by performing D/A conversion on the lower bits to phase modulation regions. The upper-bit drive unit outputs, to phase modulation regions, a value greater than a maximum value of values output from the lower-bit drive unit, or a minimum value of the values output from the lower-bit drive unit, according to a value of the upper bits. | 03-05-2015 |