Patent application number | Description | Published |
20090179699 | FULLY DIFFERENTIAL COMPARATOR AND FULLY DIFFERENTIAL AMPLIFIER - A first to a fourth sampling switch ( | 07-16-2009 |
20100271248 | RAMP WAVE OUTPUT CIRCUIT, ANALOG/DIGITAL CONVERSION CIRCUIT, AND CAMERA - A ramp wave output circuit includes a ramp wave generation circuit generating a ramp wave, and a low-pass filter having a variable cutoff frequency, which receives the ramp wave. The low-pass filter operates at a first cutoff frequency for a predetermined time period after the receipt of the ramp wave, and at a second cutoff frequency, which is larger than the first cutoff frequency, after the predetermined time period has passed. | 10-28-2010 |
20100289936 | BUFFER CIRCUIT, IMAGE SENSOR CHIP COMPRISING THE SAME, AND IMAGE PICKUP DEVICE - A buffer circuit includes: first and second cascode constant current sources ( | 11-18-2010 |
20110169990 | CURRENT GENERATION CIRCUIT, AND SINGLE-SLOPE ADC AND CAMERA USING THE SAME - A linear relationship is established between a gain control signal and an amplification factor (value in dB). Described is a current generation circuit including a first current output section which outputs a first current, a second current output section which outputs a second current proportional to the first current, and a variable-current control section which generates a third current proportional to the first current, divides the third current into a fourth current and a fifth current according to a first control signal, and outputs the fourth and the fifth currents. The current generation circuit outputs a sum of the first and the fourth currents as a reference current, and a sum of the second and the fifth currents as an output current. | 07-14-2011 |
20140034812 | VOLTAGE GENERATION CIRCUIT, ANALOG-TO-DIGITAL CONVERSION CIRCUIT, SOLID-STATE IMAGING DEVICE, AND IMAGING APPARATUS - A voltage generation circuit includes a control circuit which outputs a first digital signal, a DAC which outputs a first analog signal corresponding to the first digital signal, and an attenuator which is connected to an output terminal of the DAC and is configured to output a voltage signal obtained by attenuating the first analog signal input from the DAC. | 02-06-2014 |
20140036124 | RAMP-SIGNAL GENERATOR CIRCUIT, AND IMAGE SENSOR AND IMAGING SYSTEM INCLUDING THE SAME - The ramp-signal generator circuit includes a reference voltage generator that changes the voltage of a reference signal Vr to a comparator setting voltage VR for compensating for a voltage difference between a reference signal Vr and an analog input signal (Vs | 02-06-2014 |
20140267854 | SOLID-STATE IMAGING DEVICE AND IMAGE CAPTURING APPARATUS INCLUDING THE SAME - A solid-state imaging device including: a plurality of pixels which are on a same semiconductor substrate and each of which generates a pixel signal; a comparison circuit that is connected to the pixels in each of columns; a D/A conversion circuit that generates a comparison potential and provide the generated comparison potential in common to the comparison circuit in each column; and a D/A conversion circuit output unit provided in a common line for providing the comparison potential to the comparison circuit in each column, wherein the D/A conversion circuit output unit includes: a source follower circuit that is provided to the line and includes a first current source having a transistor, and an amplification transistor having a gate oxide film that is thinner than a gate oxide film of the transistor; and a voltage control circuit that controls a drain-to-source voltage of the amplification transistor. | 09-18-2014 |
20150076325 | RAMP GENERATOR CIRCUIT AND SOLID-STATE IMAGING DEVICE - A ramp generator circuit includes: a reference signal generator circuit which generates a ramp waveform having a slope obtained by multiplication using a power of 2 according to a value of a higher order bit of a gain control signal; a clock control circuit which selectively outputs 2̂m kinds of fractional-N clocks according to one of 2̂m (natural number) areas obtained by dividing a code range represented by a lower order bit, when a negative gain is set; and a variable gain circuit which sets a ramp waveform according to the value of the gain control signal, and sets a ramp signal amplitude in each area so that a period ratio between ramp driving clocks for adjacent areas and a ratio between an amplitude of a ramp signal when the standard gain is set and a largest amplitude of a ramp signal are equal. | 03-19-2015 |
20150077610 | SOLID-STATE IMAGING DEVICE AND CAMERA - The solid-state imaging device includes a D/A converting circuit generating a reference voltage to be used for an A/D conversion. The D/A converting circuit includes: a voltage generating circuit generating an analog voltage according to a digital signal; a buffer circuit (a resistor ladder upper voltage supplying buffer circuit) which buffers the generated analog voltage, the buffer circuit sampling and holding a bias voltage generated inside the buffer circuit, and outputting the buffered analog voltage using the held bias voltage; an analog signal outputting unit (a resistor ladder unit) outputting the reference voltage according to the inputted digital signal, by receiving an output from the buffer circuit; and a pre-charge amplifier which charges a noise-reducing capacitor in conjunction with the sampling and holding by the buffer circuit, the noise-reducing capacitor being connected to the analog signal outputting unit. | 03-19-2015 |