Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1995-03-03
1996-11-05
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 96, 327103, 341136, H03K 5153, H03M 100
Patent
active
055721532
ABSTRACT:
The offset associated with mismatch of a pair of input devices in comparators used in applications such as flash converters is eliminated by using only one input device or transconductance circuit, time-shared between the input and reference signals. The input device converts each signal in succession into a current. A current copier stores one of these currents while the input device produces the other current, and the two currents are then compared by connecting them to a common node. The comparator includes a first switch for switching between an input and reference nodes, and an input device which receives a reference signal from the reference node during a first comparison cycle, receives an input signal from the input node during a second comparison cycle, and converts the input signal and the reference signal to input and reference currents, respectively. A current copier stores the reference current during the first comparison cycle, and generates a comparison signal from the stored reference current and the input current during the second comparison cycle.
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S. J. Daubert et al., "Current Copier Cells", Electronics Letters, vol. 24, No. 25, Dec. 1988, pp. 1560-1562.
Vallancourt David G.
Viswanathan Thayamkulangara R.
Callahan Timothy P.
Englund Terry L.
Lucent Technologies - Inc.
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