Ramp generation with capacitors

Details Ramp generation with capacitors Ramp generation with capacitors

2005-04-26

2005-04-26

Tokar, Michael (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000, C341S170000, C341S172000

Reexamination Certificate

active

06885331

ABSTRACT:
A ramp generator includes an array of capacitors having a common top plate that provides a ramp output signal. Each of the capacitors has a bottom plate switched sequentially between a low reference voltage and a high reference voltage in response to a value in a shift register. For an upward ramp, capacitors can be switched to their high reference voltages in succession, increasing the output voltage on the common top plate; for a downward ramp, capacitors can be switched to their low reference voltages in succession, decreasing the output voltage. The capacitors can be switched by a multi-bit shift register, each bit of which controls one capacitor's voltage. Each time a clock signal is applied to the shift register, a value in the shift register shifts another capacitor between its low and high reference voltages.

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T. Sugiki et al, “A 60 mW 10b CMOS Image Sensor with Column-to-Column PPN Reduction,” ISSC of Digest of Technical Papers, pp. 108-109, 2000.

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