Coded data generation or conversion – Analog to or from digital conversion – Multiplex
Patent
1997-02-13
1999-02-23
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Multiplex
341155, H03M 112
Patent
active
058749098
ABSTRACT:
An integrated analog to digital interface subsystem for imaging applications includes digital global and digital pixel by pixel offset correction and scaling. The integrated interface 2 includes 3 DAC's 2c1-2c3 that are used to do a rough offset cancellation on the three analog input signals (RGB) in the analog domain. A triple sample/hold circuit 2a samples the RGB signals simultaneously, multiplexes the data and passes the three signals on the ADC 2b sequentially (at about 3 times the data rate). The sample/hold circuit 2a has the capability to operate in fully differential as well as single ended input mode, and can perform correlated double sampling if needed. A high resolution ADC 2b converts the 3 multiplexed signals from simple/hold circuit 2a. A first digital offset correction circuit 2f restores the level of the RGB signals in the digital domain on a pixel by pixel basis. A first digital gain correction circuit 2g compensates for sensitivity variations of the RGB sensors in the digital domain on a pixel by pixel basis. A second digital offset correction circuit 2h restores the overall DC level of the RGB signals in the digital domain. A second digital gain correction circuit 2i compensates for overall sensitivity variations of the RGB sensors in the digital domain. A serial interface 2d is used to load the overall gain and offset coefficients.
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Craig James R. C.
Cringean Andrew J.
Nave James E.
Peterson Kirk D.
Soenen Eric
Donaldson Richard L.
Hoel Carl H.
Hoff Marc S.
Holland Robby T.
Texas Instruments Incorporated
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