Computer graphics processing and selective visual display system – Display peripheral interface input device – Stylus
Reexamination Certificate
2006-12-20
2011-10-18
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Stylus
C345S174000, C345S173000, C178S019030, C178S019010
Reexamination Certificate
active
08040329
ABSTRACT:
An untethered device, configured to inductively couple to a source device, includes a tunable resonant circuit having a resonance frequency and configured to generate a supply voltage for the untethered device in response to a varying magnetic field produced by the source device. The tunable resonant circuit includes an inductive coil comprising a center tap and a capacitive circuit coupled to the inductive coil. The capacitive circuit includes an anti-series arrangement of varactor diodes that behave as a capacitance when placed in reverse bias. A frequency control circuit is coupled to the tunable resonant circuit and includes a control voltage source coupled to the center tap of the inductive coil. The control voltage source produces a control signal to place the varactor diodes in reverse bias and to change the capacitance of the capacitive circuit, thereby effecting a change in the resonance frequency of the tunable resonant circuit.
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3M Innovative Properties Company
Bern Steven A.
Harris Dorothy
Hjerpe Richard
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