摘要:
An imager including a self test mode. The imager includes a pixel array for providing multiple pixel output signals via multiple columns; and a test switch for (a) receiving a test signal from a test generator and (b) disconnecting a pixel output signal from a column of the pixel array. The test switch provides the test signal to the column of the pixel array. The test signal includes a test voltage that replaces the pixel output signal. The test signal is digitized by an analog-to digital converter (ADC) and provided to a processor. The processor compares the digitized test signal to an expected pixel output signal. The processor also interpolates the output signal from a corresponding pixel using adjacent pixels, when the test switch disconnects the pixel output signal from the column of the pixel array.
摘要:
An imager includes a column line connected to a pixel array for providing a pixel output signal. The pixel output signal is sampled during reset and readout phases. An analog-to-digital converter (ADC), which is coupled to the column line, samples the pixel output signal and provides a digital output signal. The ADC is configured to sample the pixel output signal twice, during the reset phase, in order to detect eclipse in the pixel output signal. The ADC includes a comparator, sequentially operated by a reset control, for comparing a first pixel output voltage and a second pixel output voltage, respectively, during the reset phase. The comparator is configured to provide an output bit indicating detection of an eclipse, based on a difference between the first and second pixel output voltages.
摘要:
Charge pumps and methods for regulating charge pumps. The charge pump includes a voltage booster circuit and a voltage regulator circuit. The voltage booster circuit includes first and second input terminals that respectively receive a regulation voltage and an input voltage. The voltage booster circuit generates an output voltage having a polarity that is different from the input voltage. The output voltage is adjusted by the regulation voltage and provided to an output terminal. The voltage regulator circuit is coupled between the first input terminal and the output terminal of the voltage booster circuit. The voltage regulator circuit shifts the output voltage to a level shifted voltage and generates the regulation voltage responsive to the level shifted voltage.