ASIC with switching noise reduction
Medical catheterization is carried out by receiving a plurality of analog bioelectric signals in respective channels and multiplexing the bioelectric signals in respective selection events. The selection events consist of making a first connection with a reference voltage, thereafter breaking the first connection and making a second connection with one of the bioelectric signals. The method is further carried out by outputting the multiplexed bioelectric signals to an analog-to-digital converter.
1. A method, comprising the steps of:
receiving a plurality of analog bioelectric signals in respective channels;
multiplexing the bioelectric signals, in respective selection events, wherein the selection events comprise making a first connection with a reference voltage and thereafter breaking the first connection and making a second connection with one of the bioelectric signals;
outputting the multiplexed bioelectric signals to an analog-to-digital converter,
wherein making the first connection and making the second connection are accomplished by placing a double pole double throw switch in a first position and a second position, respectively; and
further comprising connecting a Wilson central terminal to a first input of a differential amplifier and connecting one of the bioelectric signals to a second input of the differential amplifier, and linking first and second outputs of the differential amplifier to the double pole double throw switch.
2. The method according to claim 1 , further comprising interposing a buffer between the differential amplifier and the double pole double throw switch.