clive.boyd
HS02 High Acuity Headset Single Channel External Tx Coil Interface
A fallback single transmit Tx coil option was left on the high acuity headset to offer a simple wireless power transfer where the coil is optimally placed directly in front of the eye. A Direct-Digital-Synthesizer running at 50MHz allows full control of Magnitude, Frequency and Phase with the added advantage of providing hard wired high speed modulation control. The DDS allows precision resonance tracking at resolutions below 1Hz allowing mutual inductance and eye movement compensation between the external and implant inductive coils similar to a DPLL. the output frequency is set to track the resonance of the series-parallel tank circuits notionally set at 6.8MHz. Small changes in mutual inductance resulting from eye movements can be easily tracked using VI phase shifts.
HS02 High Acuity Headset Single Channel External Tx Coil Interface
A fallback single transmit Tx coil option was left on the high acuity headset to offer a simple wireless power transfer where the coil is optimally placed directly in front of the eye. A Direct-Digital-Synthesizer running at 50MHz allows full control of Magnitude, Frequency and Phase with the added advantage of providing hard wired high speed modulation control. The DDS allows precision resonance tracking at resolutions below 1Hz allowing mutual inductance and eye movement compensation between the external and implant inductive coils similar to a DPLL. the output frequency is set to track the resonance of the series-parallel tank circuits notionally set at 6.8MHz. Small changes in mutual inductance resulting from eye movements can be easily tracked using VI phase shifts.