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| Number | Title | Issue Date |
| 6476751 | Low voltage analog-to-digital converters with internal reference voltage and offset An A-to-D converter system having programmed reference signal levels using only supply signal provided by a power supply is disclosed. The converter system includes a comparator configured to provide comparison of an analog input signal with an adjustable... | 11/05/2002 |
| 6452528 | Double comparison successive approximation method and apparatus A double comparison successive approximation A/D converter. The converter compares the value with upper and lower limits. The bit values are not set unless the value is distant from the compared value. Otherwise, the value of the bit is held until later w... | 09/17/2002 |
| 6452666 | Optical range finder A method of determining a range of an object includes emitting light toward a target and sensing light reflected by the target. Signals corresponding to the sensed light are integrated during multiple integration periods. Each integration period is differ... | 09/17/2002 |
| 6388241 | Active pixel color linear sensor with line--packed pixel readout A CMOS active pixel color linear image sensor is operable in line-packed readout mode, and at very high speed. In accordance with a preferred embodiment, the sensor is formed entirely on a single-chip and may be further configurable for operation in paral... | 05/14/2002 |
| 6388593 | Differential non-linearity correction scheme Differential non-linearity errors in an A/D converter are corrected by an analog system. The system produces different analog voltages which are used to correct the input voltage to the capacitor. The input voltage is changed by an amount which is effecti... | 05/14/2002 |
| 6388243 | Active pixel sensor with fully-depleted buried photoreceptor A fully depleted photodiode accumulates charge into both the diode and a separate floating diffusion. The floating diffusion has less capacitance that the overall diode, thereby resulting in a knee-shaped transfer characteristic for charge accumulation. T... | 05/14/2002 |
| 6388242 | Micro power micro-sized CMOS active pixel Reduced size CMOS active pixel circuit uses special transistors with their gates and sources connected together. This transistor is placed at the top of the pixel.... | 05/14/2002 |
| 6365886 | Smart column controls for high speed multi-resolution sensors Smarts are added to a CMOS active pixel color linear image sensor operable in any of parallel-packed, pixel-packed, and line-packed readout mode, to provide the added feature of variable imaging resolution operability. By combining decoder block functiona... | 04/02/2002 |
| 6295013 | Nonlinear flash analog to digital converter used in an active pixel system A non-uniform resistor is used with a flash A to D converter in order to provide an A to D output which is not linear. The nonlinearity of the A to D output is specially designed to carry out a predetermined correction of the signal.... | 09/25/2001 |
| 6255970 | Correction of missing codes nonlinearity in A to D converters Missing code linearity in an A to D converter is corrected by associating each of the bits of a raw ADC output with a correction code for that bit.... | 07/03/2001 |
| 6239456 | Lock in pinned photodiode photodetector A lock in pinned photodiode photodetector includes a plurality of output ports which are sequentially enabled. Each time when the output port is enabled is considered to be a different bin of time. A specified pattern is sent, and the output bins are inve... | 05/29/2001 |
| 6229134 | Using cascaded gain stages for high-gain and high-speed readout of pixel sensor data A sampling and readout system including a cascaded stage charge amplifier samples, amplifies, and outputs pixel sensor data from an array of pixel sensors. The charge amplifier divides the gain into several gain stages. Each gain stage amplifies the pixel... | 05/08/2001 |
| 6222172 | Pulse-controlled light emitting diode source A light-emitting diode array is driven by a digital control. The digital control modulates the pulse width of pulses applied to the light-emitting diode. The intensity of the output is controlled by controlling the width of pulses applied to the light-emi... | 04/24/2001 |
| 6222175 | Charge-domain analog readout for an image sensor A CMOS imager includes an array of CMOS active pixel sensors and multiple column readout circuits each of which is associated with a respective column of sensors in the array and can perform correlated double sampling of values from a sensor in the respec... | 04/24/2001 |
| 6215428 | Differential non-linearity correction scheme Differential non-linearity errors in an A/D converter are corrected by an analog system. The system produces different analog voltages which are used to correct the input voltage to the capacitor. The input voltage is changed by an amount which is effecti... | 04/10/2001 |
| 6211804 | Using single lookup table to correct differential non-linearity errors in an array of A/D converters Generation of a single look-up table for performing DNL correction on an array of analog-to-digital converters (ADCS) is disclosed. Initially, the analog input voltages to the array of ADCs are generated. The input voltages ramp up in steps of some predet... | 04/03/2001 |
| 6204792 | Ping-pong readout A ping-pong A/D converter which produces an output at alternate times on alternate memories.... | 03/20/2001 |
| 6194696 | Active pixel sensor with current mode readout A current mode device for an active pixel sensor includes a voltage to current converter which includes an operation that occurs inside a source follower. The device operates to draw no current while the current is incoming. The device uses two stages of ... | 02/27/2001 |
| 6191714 | A/D converter correction scheme Differential nonlinearity is corrected by a look up table. The look up table obtains one extra bit of information and uses it to address corrected information in the look up table. The corrected look up table information represents information that is cor... | 02/20/2001 |
| 6184721 | CMOS voltage comparator capable of operating with small input voltage difference A circuit for use in comparing input voltages includes switching elements initially configured in a reset mode to minimize charge or current conduction before entering a comparison mode. A strobe signal reconfigures the switching elements to transition fr... | 02/06/2001 |
| 6166367 | Programmable analog arithmetic circuit for imaging sensor A programmable arithmetic circuit to form multiple circuit modules for different arithmetic operations that share certain common electronic elements to reduce the number of elements. Such circuit can be integrated to an imaging sensor array such as a CMOS... | 12/26/2000 |
| 6147519 | Low-voltage comparator with wide input voltage swing A low voltage comparator for amplifying a voltage difference between a pair of differential inputs. A boost capacitor charges to a boost voltage in excess of the low supply voltage, a differential pair of MOSFET transistors, each said transistor including... | 11/14/2000 |
| 6137100 | CMOS image sensor with different pixel sizes for different colors Active pixel sensor with separated pixel areas, each sensing a different primary color, red, green or blue. Each of the colors is sensed using a different size color filter element to allow receiving an amount of light dependent on the responses of the im... | 10/24/2000 |
| 6097545 | Concentric lens with aspheric correction A special concentric lens system having an air gap and at least one aspheric surface is provided to achieve a substantially uniform imaging performance in a wide angle of view with reduced aberrations.... | 08/01/2000 |
| 6087970 | Analog-to-digital conversion A circuit has an analog-to-digital converter that, during a first mode of the circuit, is configured to use capacitors of the converter to furnish a digital representation of an analog input voltage. The circuit also has an amplifier that has a gain respo... | 07/11/2000 |
| 6049247 | Low-voltage common source switched-capacitor amplifier The present disclosure describes a low-voltage switched-capacitor amplifier circuit that operates with supply voltage as low as one volt. The switched-capacitor amplifier circuit includes a voltage-amplifying transistor configured in a switched-capacitor ... | 04/11/2000 |
| 6043690 | Bidirectional follower for driving a capacitive load A bidirectional source follower system includes an N channel transistor and P channel transistor which conduct in opposite ways. The n channel transistor is connected to quickly source current, however is relatively inefficient at sinking current. In cont... | 03/28/2000 |
| 6005619 | Quantum efficiency improvements in active pixel sensors Quantum efficiency in an active pixel sensor improved by proper sizing and shaping of the contacts. The photodiode elements are formed of special shapes that are optimized for obtaining diffusion of charge, rather than obtaining the charge directly. Photo... | 12/21/1999 |
| 5995163 | Median filter with embedded analog to digital converter A digital median filter is made using a successive approximation A/D converter circuit, which is arranged to produce an output based on majority weighting.... | 11/30/1999 |
