2-FSK (Frequency Shift Keying) wake-up receiver of tuned radio frequency architecture and demodulation method thereof
A 2-FSK, wake-up receiver technology, applied in FM carrier system, power management, electrical components, etc., to achieve the effect of simple operation, reduced power consumption, and high receiving sensitivity
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[0066] Example 1
[0067] See figure 1 , figure 1 This is a flowchart of a demodulation method applied to a 2-FSK wake-up receiver for tuning a radio frequency architecture provided by an embodiment of the present invention, and is applied to a 2-FSK wake-up receiver for tuning a radio frequency architecture. As shown in the figure, the demodulation Methods include:
[0068] S1: Obtain the 2-FSK RF signal X(t),
[0069] X(t)=Acos(2πf RF t)cos(2πf IF t+θ), 0
[0070] Among them, A represents the amplitude of the radio frequency signal, f RF is the frequency of the radio frequency signal, f IF represents the frequency of the intermediate frequency signal, θ represents the phase error, and T represents a symbol time;
[0071] See figure 2 , figure 2 It is a schematic diagram of a 2-FSK radio frequency signal provided by an embodiment of the present invention. 2-FSK modulation, that is, binary digital frequency modulation, uses a binary digital baseband signal...
Example Embodiment
[0112] Example two,
[0113] Please refer to Figure 5 , Figure 5 It is a structural block diagram of a 2-FSK wake-up receiver with a tuned radio frequency architecture provided by an embodiment of the present invention. As shown in the figure, the 2-FSK wake-up receiver of the tuned radio frequency architecture of this embodiment includes: an antenna 1, a bandpass filter 2, an envelope detector 3 and a control module 4 connected in sequence, wherein the antenna 1 is used for receiving 2-FSK radio frequency signal X(t); bandpass filter 2 is used to perform bandpass filtering processing on the 2-FSK radio frequency signal X(t) to obtain a filtered signal; envelope detector 3 is used to filter the The signal is subjected to envelope detection to obtain an envelope signal Y(t); the control module 4 is configured to sample the envelope signal Y(t) and demodulate it to obtain a demodulated signal.
[0114] Specifically, the control module 4 includes a sampling unit 41, a first ...
Example Embodiment
[0118] Embodiment 3
[0119] This embodiment evaluates the performance of the 2-FSK wake-up receiver of the tuned radio frequency architecture of the above embodiment. In this embodiment, a single-chip microcomputer with a model of MSP430RF5969 is selected as the control module, and a power detector with a model of AD8309 is used as the envelope A detector to evaluate the performance of a 2-FSK wake-up receiver tuned to the RF architecture. See Table 1 for the performance parameters of the MSP430RF5969 and AD8309.
[0120] Table 1. Performance Parameters of MSP430RF5969 and AD8309
[0121]
[0122] In a 2-FSK wake-up receiver with a tuned RF architecture, the first and second frequency filters are negligible compared to the sampling time of the ADC.
[0123] Let P D,a and P D,s are the working power and sleep power of the envelope detector, P M,a and P M,s is the working power and sleep power of the microcontroller, R is the bit rate of the receiver, T sa is the samp...
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