Pin-sharing analog front-end processing apparatus and method...

Details Pin-sharing analog front-end processing apparatus and method... Pin-sharing analog front-end processing apparatus and method...

2011-03-29

2011-03-29

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S122000, C348S257000, C345S087000

Reexamination Certificate

active

07916062

ABSTRACT:
An analog front-end processing apparatus capable of sharing pins includes a plurality of positive pins, a negative pin, a plurality of positive clamping circuits, a negative clamping circuit, a plurality of sample and hold circuits and a plurality of adjusting circuits. The positive clamping circuits have positive signals fixed at their corresponding target positive voltages. The negative clamping circuit has a negative signal fixed at a first reference voltage. Each sample and hold circuit has a positive input terminal and a negative input terminal, wherein a voltage difference between the two input terminals is substantially equal to a voltage difference between the corresponding target positive voltage and the first reference voltage during a sample period, and a voltage difference between the two input terminals is equal to a voltage difference between the corresponding target negative voltage and a second reference voltage during a hold period.

REFERENCES:
patent: 5426461 (1995-06-01), Ohara
patent: 2004/0207586 (2004-10-01), Tsai et al.

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