Abstract: A black clamp stabilization circuit for an image sensor utilizes a mixed-signal SoC block comprising sub-blocks to dynamically and precisely adjust the black level based on comparison to a reference black level. The black level adjustments include a first level regulation using digital control of an analog signal in a feedback loop that includes a programmable gain amplifier and high-resolution A/D converter. By applying the black clamping in the analog domain, dynamic range is extended. Additional black level regulation is subsequently performed in the digital domain to differentially eliminate line noise and column noise generated within the imaging System-on-Chip. By providing information between the sub-blocks, the algorithms can converge more quickly. The technique enables multiple signal paths to separately handle individual colors and to increase imaging data throughput.

Abstract: Apparatus and methods for synchronizing a plurality of image sensors in a video camera system. In one embodiment, a method includes generating a video sync signal, and resetting at least one internal clock divider in each image sensor in synchronization with the video sync signal at the beginning of each video frame. Another embodiment of a method of synchronizing a plurality of image sensors in a video camera system includes detecting a phase state of a signal of at least one internal clock divider in each sensor, wherein the phase state is relative to a system sync signal, and selecting a video output signal for each sensor based on the detected phase state of the at least one internal divider. In a third embodiment, the method includes asserting an asynchronous reset signal, stopping the system clocks in the system, de-asserting the asynchronous reset signal, while the system clocks are stopped, and restarting the system clocks.

Abstract: A black clamp stabilization circuit for an image sensor utilizes a mixed-signal SoC block comprising sub-blocks to dynamically and precisely adjust the black level based on comparison to a reference black level. The black level adjustments include a first level regulation using digital control of an analog signal in a feedback loop that includes a programmable gain amplifier and high-resolution A/D converter. By applying the black clamping in the analog domain, dynamic range is extended. Additional black level regulation is subsequently performed in the digital domain to differentially eliminate line noise and column noise generated within the imaging System-on-Chip. By providing information between the sub-blocks, the algorithms can converge more quickly. The technique enables multiple signal paths to separately handle individual colors and to increase imaging data throughput.