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US Patent 6037891 - Low power serial analog-to-digital converter
US Patent Issued on March 14, 2000
Estimated Patent Expiration Date:
February 23, 2018Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
February 23, 2018Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA low power serial A/D converter cascades multiple stages (20) of a novel track-and-hold circuit (22) to implement a pipelined A/D converter. The track-and-hold circuit (22) is implemented using a differential structure to cancel out signal droop. This allows extremely high tracking bandwidths to be achieved while maintaining long hold times. Each stage (20) of the pipeline includes a binary quantizing circuit (24) which performs a 1-bit binary estimate of the data and a summing circuit (26) which updates the output of its track-and-hold circuit (22) to allow the next bits to be decided by the following stages. | InventorAssigneeApplicationNo. 027759 filed on 02/23/1998US Classes:341/161, Acting sequentially327/491, With emitter follower341/155Analog to digital conversionField of Search341/161, Acting sequentially341/135, Current mirror341/136, Field effect transistor341/143, Differential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation)341/124, Sampled and held input signal with linear return to datum341/125, Sampled and held input signal with nonlinear return to datum327/65, Differential input327/407, Converging with plural inputs and single output327/411, Bipolar transistor327/491With emitter followerExaminersPrimary: Williams, Howard L.Assistant: JeanPierre, Peguy Attorney, Agent or FirmUS Patent References4369500, High speed NXM bit digital, repeated addition type multiplying circuitIssued on: 01/18/1983 Inventor: Fette4665382, Analog-to-digital conversion Issued on: 05/12/1987 Inventor: Morgan4740907, Full adder circuit using differential transistor pairs Issued on: 04/26/1988 Inventor: Shimizu , et al.4916653, Adder using multi-state logic Issued on: 04/10/1990 Inventor: Shimizu, et al.4918640, Adder cell having a sum part and a carry part Issued on: 04/17/1990 Inventor: Heimsch, et al.5047772, Digital error correction system for subranging analog-to-digital converters Issued on: 09/10/1991 Inventor: Ribner5059829, Logic level shifting circuit with minimal delay Issued on: 10/22/1991 Inventor: Flannagan, et al.5130572, Operational track-and-hold amplifier Issued on: 07/14/1992 Inventor: Stitt, et al.5132921, High speed digital computing system Issued on: 07/21/1992 Inventor: Kelley, et al.5134579, Digital adder circuit Issued on: 07/28/1992 Inventor: Oki, et al.5237332, Receiver distortion correction circuit and method Issued on: 08/17/1993 Inventor: Estrick, et al.5315170, Track and hold circuit Issued on: 05/24/1994 Inventor: Vinn, et al.5347482, Multiplier tree using nine-to-three adders Issued on: 09/13/1994 Inventor: Williams5444447, Analog-digital converter with distributed sample-and-hold circuit Issued on: 08/22/1995 Inventor: Wingender5471413, Fast adder chain Issued on: 11/28/1995 Inventor: Sali, et al.5485106, ECL to CMOS converter Issued on: 01/16/1996 Inventor: Drost, et al.5491653, Differential carry-save adder and multiplier Issued on: 02/13/1996 Inventor: Taborn, et al.5499027, Digitally self-calibrating pipeline analog-to-digital converter Issued on: 03/12/1996 Inventor: Karanicolas, et al.5510736, Differential sampler circuit Issued on: 04/23/1996 Inventor: Van de Plassche5586071, Enhanced fast multiplier Issued on: 12/17/1996 Inventor: Flora5596520, CMOS full adder circuit with pair of carry signal lines Issued on: 01/21/1997 Inventor: Hara, et al.5635937, Pipelined multi-stage analog-to-digital converter Issued on: 06/03/1997 Inventor: Lim, et al.5638071Efficient architecture for correcting component mismatches and circuit nonlinearities in A/D converters Issued on: 06/10/1997 Inventor: Capofreddi, et al. International ClassH03M 001/38 |
