Ultra-Low Power Transmitter Applied in Multi-Channel Frequency Shift (FSK) Communication

摘要

An ultra-low power transmitter applied in multi-channel frequency shift keying (FSK) communication is provided. The transmitter includes a fixed-frequency generation device, a low-frequency frequency synthesizer, and an injection locking device. The fixed-frequency generation device provides a reference frequency to the low-frequency frequency synthesizer. The frequency synthesizer divides the reference frequency with corresponding divisors for generating a plurality of divided frequency signals. Then, the divided frequency signals are injected into the injection locking device. The injection locking device will lock at the average frequency of previously mentioned divided frequencies. Wherein, the injection locking device filters the high frequency noise, which is produced by the frequency synthesizer, at the time of the injection locking. The ultra-low power transmitter obtains a high-frequency transmitted signal by using the frequency-locked signal.

主权项

1. An ultra-low power transmitter applied in multi-channel frequency shift keying (FSK) communication, comprising:
a fixed-frequency generation device providing a reference frequency; a low-frequency frequency synthesizer receiving the reference frequency many times according to a time sequence, and dividing the reference frequency with corresponding divisor, such that a plurality of divided frequency signals being generated; and an injection locking device electrically connected to the low-frequency frequency synthesizer, wherein the low-frequency frequency synthesizer injects the plurality of divided frequency signals to the injection locking device according to the time sequence, such that the injection locking device generates a frequency-locked signal and filters a high-frequency noise resulted from the low-frequency frequency synthesizer at the same time, wherein the ultra-low power transmitter utilizes the frequency-locked signal to obtain a high-frequency emission signal.