Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1994-12-01
1996-09-10
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327560, 327563, 341159, 341161, H03K 524, H03M 172
Patent
active
055549438
ABSTRACT:
An improved magnitude amplifier (magamp) is provided for a serial-type A/D converter. The magamp includes an improved differential input amplifier circuit to which offset circuitry is connected. These elements may be implemented in a single integrated circuit chip or as separate discrete circuits in hardware. The differential input amplifier circuit includes two pairs of differential input transistors, a comparator, and current switching control transistors. The comparator provides outputs that drive the current switching control transistors. The current switching control transistors are connected below the input transistors and not above the input transistors to reduce the parasitic capacitive loading at the outputs of the differential input amplifier circuit and increase the speed of the magamp. The offset circuitry provides the appropriate signals for aligning the output signals for output to the next stage magamp.
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Analog Devices Inc.
Callahan Timothy P.
Englund Terry L.
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