Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1996-04-22
1997-07-01
Fahmy, Wael
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 91, 327 94, 327271, 327362, H03K 5159, G06G 710
Patent
active
056442572
ABSTRACT:
The detrimental nonlinear charging currents from an analog input signal through an anti-aliasing filter into a sampling circuit can be minimized by using primary and secondary inputs to the sampling circuit. The secondary input is turned on before the primary input and the charge required to charge the parasitic capacitance inside the sampling circuit and to replenish the channeling charge lost in the previous cycle is supplied primarily through the secondary input. Immediately after the secondary input is turned off the primary input is connected to the sampling node, and only the charge required to fine tune the signal into the sampling capacitor is drawn through the primary input. Therefore, most of the non-linear charge injection is passed through the secondary input, and the signal passed through the primary input is used to fine tune the voltage levels inside the sampling circuit during the actual sampling operation.
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patent: 5187390 (1993-02-01), Scott, III
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Data sheet, "CS5016 CS5014 CS5012A 16, 14 & 12-Bit, Self-Calibrating A/D Converters," 1992 Crystal Semiconductor Data Book, pp. 3-24--3-25.
Sooch, N.S. et al., "18-Bit Stereo D/A Converter with Integrated Digital and Analog Filters", 1991 Audio Engineering Society Preprint, Presented at the 91st Convention 1991, Oct. 4-8, New York.
Kasha Dan B.
Kerth Donald A.
Mellissinos Anthony G.
Swanson Eric J.
Abraham Fetsum
Crystal Semiconductor Corporation
Fahmy Wael
Lott Robert D.
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