Abstract:
A bio-optical sensor has a surface provided with an array of sensing pixels and calibration pixels. The sensing and calibration pixels are arranged in an interleaved fashion. The sensing and calibration pixels may be interleaved 1:1, or they may be arranged in interleaved blocks. The image plane receives an analyte and a reagent that reacts with the analyte to produce light. The sensing pixels generate signals as a function of the light produced.
Abstract:
A CMOS image sensor and method for making such a sensor includes a coating over the photosensing parts, wherein the coating performs a dual function. In fabrication, the coating prevents the formation of silicide, which is not optically opaque, on the photosensing parts. When the CMOS sensor is in use, the coating helps to couple light onto the photosensing parts, and therefore acts as an anti-reflective layer. The method of fabrication uses a self-aligning technique, which ensures pixel-to-pixel uniformity.
Abstract:
An image sensor has an array of pixels read by column circuits to provide reset and read samples on a pair of sample capacitors. To alleviate the effects of parasitic capacitance in the region of the sample capacitors, a modified timing arrangement is used. Both sample switches are operated simultaneously to pre-charge both sample capacitors with a pixel signal value. One sample switch is operated after reset to apply a reset value to one of the pre-charged sample capacitors.
Abstract:
A solid state image sensor has an array of pixels in which each column has a reset voltage line and a read line. The sensor is reset and read a row at a time, with reset-related values held in a frame buffer for subsequent subtraction from read values. Reset-related values are derived in each column by sampling the voltage during reset on one capacitor and the voltage on release of reset on a second capacitor, and differencing these values to provide an output for the frame buffer. This provides a reduction in the size of frame buffer which would otherwise be required.
Abstract:
A CMOS output buffer uses feedback from a ground node to reduce ground bounce by utilizing a tolerable ground bounce limit, making it less sensitive to operating conditions and processing parameters. An input to the NMOS device of the output buffer is provided by the output of a control element which receives a first input from a pre-driver and a second input (i.e., the feedback) from the ground node.
Abstract:
A digital frequency divider has a single circulating shifter register loaded with a bit sequence of variable length and having two outputs adjacent such that are output is equal to the other delayed by one clock period. The outputs are passed to a multiplexer via further logic, the multiplexer selecting one of two inputs depending on whether a clock is high or low. Program logic is provided so that the circuit is configurable for odd, even or half integer division by detecting changes in the bit sequence between 0 and 1 and selectively nulldeletingnull the first half clock cycle when a change is detected. This allows even, odd or half integer clock division with an nullevennull mark space ratio.
Abstract:
A system for reducing the number of programmable architecture elements in a look-up table required for implementing Boolean functions or operations that are identical or logically equivalent is provided. The system may include a single set of storage elements connected to the inputs of multiple decoders, and the storage elements may be concurrently accessed by the decoders to provide simultaneous multiple outputs thereto.
Abstract:
A solid state image sensor includes an array of pixels and a corresponding array of microlenses. The positions of the microlenses relative to their corresponding pixels may vary according to the distances of the pixels from a central optical axis of the image sensor to substantially eliminate vignetting of light collected by the microlenses.
Abstract:
There is disclosed a method and circuit for allowing access to a shared memory by at least two controllers having different bus widths. Such method and circuit provides particular advantages in its application to controlling access to a shared memory in a digital set-top-box of a digital television receiver. An arbiter is provided to access between memory accesses by first and second memory access circuitry. The first memory access circuitry accesses a block of data in the shared memory, and the second memory access circuitry accesses two blocks of data in each memory access. Each second memory write access comprises reading blocks of data from first and second memory locations and then writing blocks of data to first and second memory locations.
Abstract:
A method is provided for operating a programmable logic array in an integrated circuit. Each stage of the circuit is enabled only during the time necessary for that stage to propagate an incoming signal. Enable signals are generated for the stages of the circuit, using a dummy circuit which replicates elements of the circuit in dimension, orientation and connectivity. These elements provide a delay path, such that an input signal applied coincidentally to the programmable logic array circuit and the dummy circuit produces outputs of the dummy circuit which define times for applying and removing the enable signals from stages of the programmable logic array circuit.