Invention Grant
- Patent Title: Circuit and method for control of counter start time
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Application No.: US16175586Application Date: 2018-10-30
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Publication No.: US11128307B2Publication Date: 2021-09-21
- Inventor: Rui Wang , Yu-Shen Yang , Shan Chen , Min Qu
- Applicant: OmniVision Technologies, Inc.
- Applicant Address: US CA Santa Clara
- Assignee: OmniVision Technologies, Inc.
- Current Assignee: OmniVision Technologies, Inc.
- Current Assignee Address: US CA Santa Clara
- Agency: Christensen O'Connor Johnson Kindness PLLC
- Main IPC: H03M1/00
- IPC: H03M1/00 ; H03M1/06 ; H04N5/361 ; H04N5/376 ; H04N5/369 ; H04N5/378

Abstract:
An analog to digital conversion (ADC) circuit includes a ramp circuit coupled to output a ramp signal, and the ramp signal is offset from a starting voltage by an offset voltage. The ramp signal ramps towards the starting voltage. A counter circuit is coupled to the ramp circuit to start counting after the ramp signal returns to the starting voltage, and a comparator is coupled to the counter circuit and a bitline to compare the ramp signal to a pixel signal voltage on the bitline. In response to the ramp signal equaling the pixel signal voltage, the comparator stops the counter.
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