| 摘要 |
SYSTEMS AND METHODS FOR MEASURING THE FREQUENCY OF SIGNALS GENERATED BY HIGH FREQUENCY MEDICAL DEVICES Systems and corresponding methods for determining characteristics of an output signal generated by a high-frequency medical device using low-frequency measurement systems are disclosed. A digital measurement system includes an oscillator (210), a mixer (240), and a controller (22) coupled to each other. The oscillator (210) provides a reference signal having a second frequency. The mixer (240) generates a down converted signal based on the output signal and the reference signal. The controller (22) then determines a characteristic of the output signal (e.g., frequency or phase) based on the down-converted signal. An analog measurement system includes a filter (320) having a center frequency, a rectifier (330), and a controller (22). The filter (320) filters the output signal and the rectifier (330) rectifies the filtered signal. The controller (22) samples the rectified signal and determines a characteristic of the output signal based on the level of the rectified signal. The reference signal controller may adjust a characteristic of the output signal based on the determined frequency and/or phase of the output signal. Start Provide a main signal , Filter the main signal to 550 generate first filtered signal Rectify the second filtered 520--, signal Rectify the first filtered signal into DC signal 555 Is 5657 5255 525 , a phase shift . Yes Adjust main Supply first rectified signal greater than a predetermined signal to controller threshold Adjus: mai53es frequency shift 560 signal greater than predetermined threshold No 540-" Amplify main signal 545-- ,, Filter amplified main signal to generate second filtered sig nal 1FIA.' 5 |
