Flash converter differential reference ladder adjustment...

Details Flash converter differential reference ladder adjustment... Flash converter differential reference ladder adjustment...

2011-07-12

2011-07-12

Lauture, Joseph (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S120000

Reexamination Certificate

active

07978112

ABSTRACT:
An adjustment circuit for use with a resistive reference ladder that establishes nominal reference steps and a common mode voltage for a plurality of comparators, such as used in a flash converter. An “H” arrangement of current sources injects current at a first node, VH, and sinks at a second node, VL. with VH, and VL. being coupled to ends of the ladder. The voltage difference between these two nodes thus controls the scale applied to the reference ladder, without affecting a common mode voltage reference Vcm. Alternatively, the current source may inject current at VLand sink current at VHto decrease the reference for each comparator.

REFERENCES:
patent: 6882294 (2005-04-01), Linder et al.
patent: 6989778 (2006-01-01), Clara et al.
patent: 7023147 (2006-04-01), Colby et al.
patent: 7061419 (2006-06-01), Sushihara et al.

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