Methods and apparatus for tuning in an inductive system

Details Methods and apparatus for tuning in an inductive system Methods and apparatus for tuning in an inductive system

2006-04-25

2006-04-25

Trost, William (Department: 2683)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S041100, C455S075000, C455S150100, C455S181100, C455S188100, C455S191200

Reexamination Certificate

active

07035608

ABSTRACT:
Electronic circuitry supports utilization of a series of pulses of varying width to tune a transducer (e.g., a coil that produces or receives a magnetic field) for transmitting or receiving. For example, a control voltage generator generates a sequence of digital pulses of varying pulse widths to produce respective control voltages. The control voltage generator applies a produced control voltage to a varactor element whose capacitance changes depending on a magnitude of the produced control voltage. The varactor element forms part of a tank circuit. Consequently, the series of pulse widths controls an operating frequency of the tank circuit at different times. The tank circuit includes an inductive coil that is tuned to produce or receive a magnetic or inductive field.

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