H - Electricity – 03 – K
Patent
H - Electricity
03
K
352/21, 318/24
H03K 4/00 (2006.01) G11C 27/02 (2006.01) H03F 1/30 (2006.01)
Patent
CA 1336725
Provided is a circuit for removing an unwanted temporal por- tion of an incoming signal and for differentiating that signal with respect to a reference voltage level. It includes an input for receiving the incoming signal current through an input cap- acitor, a differential amplifier for converting input charging current into a voltage with respect to a reference voltage, and a charging capacitor for holding a voltage level representative of the charging current supplied to the differential amplifier during times when the unwanted input signal portion is to be re- moved from the circuit's output. A current sink and source pro- vides a reset period voltage charge to the input capacitor during times when the unwanted portion is to be removed from the out- going signal. A switch responds to a reset signal immediately preceding or on the occurrence of the unwanted signal portion. The charging capacitor means is charged during the gradually sloping portion of the incoming signal so as to hold a voltage level representative of the incoming charging current when the rapid slope transition (unwanted signal portion) occurs. During such time the reset signal causes the switch to allow the charg- ing capacitor to provide its stored voltage level via the current sink and source to the differential amplifier and input capacitor.
559935
Magnetic Peripherals Inc.
Smart & Biggar
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