Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1994-11-01
1996-06-04
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 108, A61N 1362
Patent
active
055228666
ABSTRACT:
A method and apparatus is disclosed for use in an implantable device that communicates with an external device through pulse position modulation. A timing generator is provided as part of said implantable device that determines the phase uncertainty between an external signal and an internal cock signal. The phase uncertainty then is added to the preset delay period to more precisely control the position of the response. The phase uncertainty is measured by a dual slope circuit that varies a state variable (which can be a digital timer, a capacitor voltage, or the like) at a fixed rate with either a positive or negative slope. When the external signal is detected, the state variable is reset and then decreased at a fixed rate until the next positive edge of the clock signal. The state variable then is increased at the same rate until the subsequent positive clock edge. The resulting variable value is proportional to the phase uncertainty. When the delay timer reaches zero, the state variable is again decreased at the same fixed rate until the initial value is reached, at which the output response is generated.
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Analog Phase Measuring Circuit for Digital CMOS IC's, A Rothermel and F. Dell'ova, IEEE Journal of Solid-State Circuits, vol. 28, No. 7, Jul. 1993.
Heim Michael F.
Intermedics Inc.
Kamm William E.
Merkling John
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