SAR with partial capacitor sampling to reduce parasitic...

Details SAR with partial capacitor sampling to reduce parasitic... SAR with partial capacitor sampling to reduce parasitic...

2005-12-20

2005-12-20

Wamsley, Patrick (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S118000

Reexamination Certificate

active

06977607

ABSTRACT:
SAR with partial capacitor sampling to reduce parasitic capacitance. An analog-to-digital convertor is disclosed with reduced parasitic capacitance on the input during a sampling operation. A charge-redistribution, binary-weighted switched-capacitor array is included having a plurality of array capacitors that each have a commonly connected plate interfaced to a first common node and a switched plate, the switched plate operable to be switched between first and second reference voltages during a redistribution phase and select ones of the capacitors additionally operable to be switched to the input during a sampling phase. Each of the array capacitors has a parasitic capacitance associated therewith. A compensation capacitor having a common plate is connected to the first common node and a switched plate, the compensation capacitor operable to be switched to the input during the sampling phase and to the first reference voltage during the redistribution phase. The compensation capacitor has a parasitic capacitance less than the parasitic capacitance of the combination of all of the non select ones of the array capacitors. A comparator compares the voltage on the first common node to a compare reference voltage during the redistribution phase. A successive approximation controller is provided for switching the switched plate of the array capacitors between the first and second reference voltages in accordance with a successive approximation algorithm during the redistribution phase.

REFERENCES:
patent: 4399426 (1983-08-01), Tan
patent: 5027814 (1991-07-01), Carroll et al.
patent: 5235333 (1993-08-01), Naylor et al.
patent: 5581252 (1996-12-01), Thomas
patent: 5606320 (1997-02-01), Kleks
patent: 5684487 (1997-11-01), Timko
patent: 6124818 (2000-09-01), Thomas et al.
patent: 6288664 (2001-09-01), Swanson
patent: 6400302 (2002-06-01), Amazeen et al.
patent: 6456220 (2002-09-01), Leung et al.
patent: 6538594 (2003-03-01), Somayajula
patent: 6559789 (2003-05-01), Somayajula
patent: 6587066 (2003-07-01), Somayajula
patent: 6600437 (2003-07-01), Confalonieri et al.
patent: 6603415 (2003-08-01), Somayajula
patent: 6667707 (2003-12-01), Mueck et al.
patent: 6720903 (2004-04-01), Confalonieri et al.
patent: 6747589 (2004-06-01), Srinivasan et al.
patent: 6850181 (2005-02-01), Tsinker

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