Synchronized voltage controlled oscillator lap counting circuit

摘要

A synchronized voltage controlled oscillator lap counting circuit includes a bearing resolver circuit having a single Hall-effect sensor element which provides differential voltage output signals in response to an external magnetic field. The differential amplifier receives the differential voltage output signals and provides a single amplified output signal. The single amplified output signal is provided to a voltage controlled oscillator. A pedometer provides a repetitive pulsed-output signal in accordance with movements of a user. The repetitive pulsed-output signal and a voltage controlled oscillator output signal are provided to a micro-controller. The micro-controller samples the voltage controlled output signal in synchronization with the repetitive pulsed signal output from the pedometer to resolve bearing directions based on intercepted frequencies of the voltage controlled output signal.