Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1995-03-23
1996-10-15
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327165, 327554, 327559, 327561, H03K 500
Patent
active
055658121
ABSTRACT:
In a remote control system, a receiver demodulates an incoming signal that is typically RF into a digital signal. Signal shaping is required in order to transform small AC signal variations into clean, full-level digital signals. An increased sensitivity signal shaper circuit uses AC coupling with a fully differential architecture. A capacitor couples the input signal to a fully differential operational amplifier where a feedback capacitor sets the gain and a switched capacitor sets the time constant and operating point. The differential operational amplifier has a differential output that is fed into a single ended output comparator that is followed by a schmidt trigger which restores the signal to full logic levels.
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Callahan Timothy P.
Donaldson Richard L.
Franz Warren L.
Holland Robby T.
Nu Ton My-Trang
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