Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Converting – per se – of an ac input to corresponding dc at an...
Patent
1994-12-01
1997-11-04
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Converting, per se, of an ac input to corresponding dc at an...
327 65, 327563, 341159, 341161, H03M 112, H03M 146
Patent
active
056844190
ABSTRACT:
A serial-type A/D converter uses magnitude amplifiers("magamps") and comparators for effecting the conversion of analog signals to Gray scale code signals that are then converted to binary digital signals by a Gray scale code-to-binary portion of the serial-type A/D converter. More specifically, a serial-type A/D converter uses an n-bit converter that has n-1 magamps and n-comparators. The n-1 magamps are cascaded such that the V.sub.OL and V.sub.OH outputs of a stage are the inputs to the next stage. The output of the comparators are input to the Gray scale code-to-binary portion of the serial A/D converter. The latching of the comparators occurs outside of the magamps. This allows for the parallel latching of the n comparators. The speed of the serial-type A/D converter is determined by the bandwidth of the magamps. The serial-type A/D converter includes an offset method that significantly reduces the effects of early voltage, V.sub.A, on the output waveforms. Each stage of the serial-type A/D converter may have any desired gain and not limited to a particular gain.
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Moreland Carl W.
Murden Frank
Analog Devices Inc.
Callahan Timothy P.
Englund Terry L.
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