TWI222280B - Super-regenerative radio frequency receiver and the data receiving method thereof - Google Patents

Abstract

A super-regenerative radio frequency receiver and the data receiving method thereof are provided. The super-regenerative radio frequency receiver includes an oscillator, a rectifier, a low pass filter, and a common mode feedback circuit. Wherein, the oscillator oscillates the oscillating output signal according to the radio frequency signal and the quench signal. The rectifier rectifies the rectifying signal according to the oscillating output signal. The low pass filter filters the rectifying signal to obtain the data signal. The common mode feedback circuit detects the common voltage of the data signal, and feeds back the common mode feedback signal to the rectifier; the rectifier receives the common mode feedback signal to adjust the rectifying signal. The present invention is to add the common mode feedback circuit and changes the rectifier to the integration-rectifier with feedback, thus the present invention can improve the sensitivity of the super-regenerative radio frequency receiver.

Description

Amendment No. 0 92113058 _ Amendment V. Description of the Invention (1) Technical Fields of the Invention The present invention relates to a radio frequency receiver (Radio Frequency Receiver) and its data receiving method, and more particularly to an ultra-high-frequency receiver. Self-excited radio frequency receiver (Super-Regenerative Radio Frequency Receiver) and its data receiving method. Prior art On-Off Keying (00K) radio frequency receivers are commonly used in remote control applications, such as low 4 speed command control of toy cars or electronic devices. Please refer to Figure 1, which shows the waveform diagram of the ON / OFF key modulation signal. It can be seen from Fig. 1 that the ON / OFF key modulation signal is a signal having a carrier frequency which is modulated by a binary code. For the transmitter, when the output binary code is low level · bit, the output ON / OFF key modulation signal is low level (no carrier frequency); and when the output binary code is high level, The output ON / OFF key modulates the signal to a high level (with carrier frequency). For the receiver, a stronger or weaker signal is received depending on the distance between the receiver and the transmitter. Then, the oscillator on the receiver will oscillate faster or slower depending on the received signal strength. Then, from the slower or slower oscillation, the receiver can distinguish whether the signal input by the transmitter is 丨 or 〇. Next, please refer to FIG. 2, which shows a green block diagram of a conventional ultra-self-excited RF receiver in green. It can be seen from Section 2 that the ultra-self-excited radio frequency receiver 20 includes an oscillator 202, a capacitor 204, a low-pass filter 206, and a shaper (SI iCer) 208. The low-pass filter 206 includes a resistor 210 and a capacitor 212. Next, the functions of each part of the ultra-self-excited RF receiver 20 will be explained.

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The oscillator 202 is configured to oscillate an oscillating output signal according to the radio frequency signal and the Signal). The ^ signal (Quench signal, break signal, and oscillating output signal waveform J is shown in the graph ::::. It can be seen from Figure 1 that the break signal is a sawtooth wave signal, and when the RF signal is low Electricity at a level rate of 400kHZ = direct current potential filtering, so that the output voltage of the oscillation output signal is ϊ ϊ Ξ 2 V or less? As long as the AC signal in the output signal is: 戒. The shaper is 2 ° Series 8 is used to shape the data signal. However, in the ultra-self-excited RF receiver 20, because the capacitance of the capacitor 204 is large, it cannot be placed in the integrated circuit. Similarly, because of the low-pass filter The cut-off frequency of 206 is very low, so the resistance value of the resistor 2 and the capacitance value of the power valley 212 will also be very large, which will also make it impossible for the resistor 21 and the capacitor 212 to be placed in the integrated circuit. Self-excited RF receiver 20 will have the disadvantage of being too bulky. ° Please refer to Figure 4 below, which shows a conventional block diagram of another type of ultra-self-excited RF receiver. As shown in Figure 4 The ultra-self-excited RF receiver 40 includes a low noise amplifier (Low Noise Ampli fier * (referred to as LNA) 402, vibrator 404, envelope detector (Envelope Detector) 406, low-pass filter 408, shaper 410, automatic gain control (Automatic Gain Control (AGC) filter 412, voltage

11222twfl.ptc Page 9 No. 92113058 Amendment V. Description of the Invention (3) To current converter 414, automatic gain control filter 416, and voltage to current converter 4 1 8. Among them, the automatic gain control filters 4 丨 2 and 4 丨 6 are composed of low-pass filters to obtain the energy level of the detection signal. In the ultra-self-excited radio frequency receiver 40, when the radio frequency signals have different levels, and the oscillation output signals of different levels are input to the envelope detector 406, the detection signals output by the envelope detector 406 will be caused. Generate a wide range of changes, for example, 'will make the common-mode voltage of the data signal output by the low-pass filter 4 08 change greatly, and make the low-pass filter 4 08 and the shaper 4 i 〇 Saturated. This will cause errors in the output data output by the shaper 41. In addition to different levels of RF signals that can cause saturation of the low-pass filter 408 and the shaper 410, changes in the process will also make the saturation more severe. Therefore, super-self-excited RF receivers 40 will Because of different levels of RF signals and different processes, its sensitivity is reduced. "In view of this, the present invention proposes an ultra-self-excited radio frequency receiver and its data receiving method. The present invention is to increase the common mode feedback circuit (Common Mode Feedback Circuit) to (Rectifier, also known as a rectifier) is changed to an integral-detector with feedback, so the present invention can improve the sensitivity of an ultra-self-excited RF receiver. To achieve the above and other objectives, the present invention proposes an ultra-self-excited RF receiver This ultra-self-excited RF receiver includes an oscillator, a detector, a low-pass ferrule, and a common-mode feedback circuit. The oscillator is used to oscillate according to the RF signal and the Quench Signal. Oscillation output signal. The detector is coupled to the oscillator to output the signal based on the oscillation.

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No. 921130 Ming Muyue Day Amendment V. Description of the Invention (4) No. ’Detect out the detection signal. The low-pass filter is coupled to the detector to filter the detection signal to obtain a data signal. The common-mode feedback circuit is lightly connected to the low-pass filter and the detector to detect the common-mode voltage of the data signal and return the common-mode feedback signal to the detector. The detector will receive the common-mode feedback signal. To adjust the detection signal. In a preferred embodiment of the present invention, the common-mode feedback signal is a common-mode feedback current, and the detector includes a reference current source, a current adding circuit, and a virtual differential detector. The reference current source is used to provide a reference current. The current adding circuit is coupled to the reference current source, and is used to add the reference current and the common mode feedback current to output the operating current. The virtual differential detector is coupled to the current adding circuit to detect the oscillating output signal to obtain the detection signal. The virtual differential detector uses the magnitude of the operating current to adjust the output level of the detection signal. In a preferred embodiment of the present invention, the common-mode feedback circuit includes a comparison and amplifier and a feedback low-pass filter. Among them, the comparison and release device is used to compare and amplify the data signal with the reference common mode voltage, and then output the comparison signal. The feedback low-pass filter is coupled to the comparison and amplifier to filter the comparison signal to obtain a feedback signal. The invention also provides a data receiving method for an ultra-self-excited radio frequency receiver. This data receiving method is used to receive radio frequency signals to obtain data signals. In this data receiving method, a rest signal is first provided. Then, the oscillation output signal is oscillated according to the radio frequency signal and the rest signal. Next, the common-mode voltage of the data signal is detected and the common-mode feedback signal is returned. Next, the detection signal will be detected based on the oscillating output signal, and

11222twfl.ptc Page 11 I22228〇r ^ .Ur 9V ^ I r ^ > —U No. 92113058 _Ά Revision V. Description of the invention (5) Common mode feedback signal ’to adjust the detection signal. The detection signal is then filtered to obtain a data signal. In summary, the present invention is to increase the common-mode feedback circuit and change the detector to an integrating-detector with feedback, so that the detector, low-pass filter, and shaper will not be saturated. Therefore, the output signal output by the shaper will not generate errors, so the present invention can improve the sensitivity of the ultra-self-excited RF receiver. In order to make the above and other objects, features, and advantages of the present invention * more obvious and easier to understand, hereinafter, a preferred embodiment is described in detail with the accompanying drawings as follows: Embodiment: Refer to FIG. 5 for details. The reason is a circuit block diagram of a super self-excited radio frequency receiver according to a preferred embodiment of the present invention. It can be seen from FIG. 5 that the ultra-self-excited RF receiver 50 includes a sawtooth wave generator (Saw

Generator) 502, oscillator 504, detector (Recti fier, also known as rectifier) 5 0 6, low-pass filter 5 0 8, common mode feedback circuit (Copmon Mode Feedback Circuit (CMFB)) 510, and 'and shaping器 (siicer) 512. Next, it will be explained that the power sawtooth wave generator 502 of each part of the ultra-self-excited RF receiver 50 is used to generate a quiescent signal (Quench Signal). In this preferred embodiment, the rest signal is the rest current signal Iq, which is approximately a sawtooth wave signal having a frequency of 400 kHz. The oscillator 504 is coupled to the sawtooth wave generator 502, and is configured to oscillate an oscillating output signal vosc according to the radio frequency signal RF and the stop signal iq. Oscillator IM8I im Page 12 11222twfl.ptc I222f 8H W ϋό, J. ^ Iti ^^ 92113058 Amendments to Rev. 5, Description of Invention (6) ^ 5 04 will oscillate the oscillating output signal VQSC according to the strength of the RF signal RF Faster or slower. Among them, the oscillating output signal Vosc is a differential signal, including the oscillating output signal vosci and the oscillating output signal Vosc2. The detector 506 is coupled to the oscillator 504 to detect the detection signal Vrect according to the oscillating output signal vosc '. At each period of the rest signal, the detector 506 integrates the oscillating output signal VQSC and detects the output. Detection signal Vrect. The low-pass crossing wave device 508 is coupled to the detector 506 for low-pass filtering the detection signal Vrect to remove noise and the like contained in the detection signal vrect to obtain a data signal. . The common-mode feedback circuit 5 1 0 is coupled to the low-pass filter 5 0 8, the detector 5 0 6 ′, and the shaper 5 丨 2 to detect the common-mode voltage of the data signal Vlpf and grant the common-mode feedback. The signal is sent to the detector 506, and the detector 506 will receive the common mode feedback signal 'to adjust the detection signal. In this preferred embodiment, the common-mode feedback signal is the common-mode feedback current ICMFB. The α shaper 5 1 2 is connected to the low-pass filter 508, and uses k t to shape the data signal VLPF 'and output digital data such as a binary code. From the above, it can be known that the biggest difference between the ultra-excited RF receiver 50 of the present invention and the conventional ultra-excited RF receiver is the detector 506 and the common-mode feedback circuit 510. The wave device 506 and the common circuit 510 will be described in detail below. ^ π w Please refer to FIG. 6 ′, which shows a circuit block diagram of a detector in an ultra-self-excited radio frequency receiver according to a preferred embodiment of the present invention. It can be seen from FIG. 7 that the wave filter 5 0 6 includes a reference current source 6 0 2 and a current adding circuit.

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"Repair B" V. Invention Description (7) 604 and Pseudo Differential Rectifier 606. The reference current source 602 is used to provide a reference current I ref. The current adding circuit 604 is connected to the reference current source 602 to add the reference current Iref and the common-mode feedback current iCMFB, and the output operation is used as the current (I ref + I CMFB). The virtual differential detector 606 is connected to the current addition circuit 604 'for detecting the vibration output signal Vosc to obtain the detection signal v rect' The virtual differential detector 6 0 6 uses the operating current to operate the current (I w + I CMFB) to adjust the output level of the detection signal Vrect. > For more clarity, please refer to FIG. 7 next, which shows a detailed circuit diagram of a detector in an ultra-self-excited radio frequency receiver according to two preferred embodiments of the present invention. As can be seen from Fig. 7, the reference current source 602 is composed of a current mirror for reference current Iref. The current adding circuit 604 adds the reference current > 'IL I ref and the common mode feedback current I CMFB' to output an operating current (I ^ + ICMFB) to the virtual differential detector 606. The virtual differential detector 606 includes a crystal 702, a transistor 704, a transistor 706, and a capacitor 708. Among them, the first source / drain of the transistor 702 is coupled to the first source / drain of the transistor 704 ′, the first source / drain of the transistor 706, and one end of the capacitor 708. , Operating current (Iref + ICMFB), and detection signal Vrect. The second source / drain of transistor 702 and the second source / drain of transistor 704 are coupled to ground. The gate of the electric body ^ 〇2 is coupled to the oscillation output signal Voscl. The = pole of transistor 704 is connected to the vibration output signal V_2. The gate of the transistor 70 6 is coupled to the stop signal. The second source / drain of the transistor 706 and another oscillator of the capacitor 708 are coupled to the supply voltage VDDA. In addition, the discharge circuit 710 is used to prevent the components in the 1 pseudo-differential detector 606 from being saturated. False

From the above, it can be seen that the detector 506 is a current type integrating rectifier. In addition, the virtual differential detector 606 increases the gain ^ of the detector 506. Furthermore, since the capacitor 708 is composed of an M 0 S capacitor, external components can be reduced. In addition, because the detector 506 does not saturate, it is possible to prevent the low-pass filter 508 and the shaper 512 from being saturated, and the output data output from the shaper 5 1 2 will not cause erroneous feelings. This can improve sensitivity. Next, please refer to FIG. 8, which shows a circuit block diagram of a common mode feedback circuit in an ultra-self-excited radio frequency receiver according to a preferred embodiment of the present invention. As can be seen from FIG. 8, the common-mode feedback circuit 51o includes a comparison and amplifier 802, a feedback low-pass filter 804, and a voltage-to-current converter 806. The comparison and amplifier 802 is operated in a sub-threshold mode, which compares and amplifies the data signal Vlpf with a reference common-mode voltage VCM, and outputs a comparison signal. The feedback low-pass sputtering device 804 is coupled to the comparison and amplifier 802 for comparing the comparison signal & wave to obtain a feedback signal. The voltage-to-current converter 806 is a 'fail-to-feedback low-pass filter 804, which converts the feedback signal into a common-mode feedback current. For the sake of clarity, please refer to Section 9 (b), which shows a detailed circuit diagram of the common mode = transmission circuit in a super self-excited RF receiver according to a preferred embodiment of the present invention. It can be seen from FIG. 9 that the transistor 902 and the transistor 904, which are both operated in a subcritical mode, are compared with the amplifier 802. In addition, the second source / drain of the transistor 902 and the second source / drain of the transistor NM are consumed together. The first source / drain of the transistor 9 0 2 is coupled to one end of the current mirror. The gate of the transistor 9 0 2 is coupled to the data signal Vlpf. Transistor

i number 92113058 V. Description of the invention (9)

The first source / drain system of the body 904 is coupled to the current mirror 906. The gate system of the other body 904 is lightly connected to the reference common mode voltage. As can be seen from the above, since the comparison with the amplifier 80 2 series operates in subcritical mode, the capacitor 9 0 8 in the low-pass filter 8 0 4 only needs a small capacitance value, so the capacitor 9 08 can be placed in the integrated circuit In. In addition, the common mode feedback circuit 5 10 is used to define the operating point of the detection signal. Therefore, the gain of the detector 506 can be set higher, and the detector 506 is not saturated. Next, please refer to FIG. 10, which shows a waveform diagram of an ultra-self-excited RF receiver before using a common mode feedback circuit according to a preferred embodiment of the present invention. The data receiving method of the ultra-self-excited radio frequency receiver 50 before using the common mode feedback circuit 5 10 will be described below with reference to FIG. 10. First, the false-tooth wave generator 502 will generate a rest signal iq. As shown in Fig. 10, the 'rest signal Iq is a sawtooth signal having a frequency of approximately 400 kHz. Then, the oscillator 504 will generate a vibration output signal Vosc based on the RF signal}? 1 and the stop signal u. As can be seen from Fig. 10, when the RF signal iRF is at a low level (i.e., 'binary 0'), the oscillation output signal ν is output. The% oscillation is slower; and when the RF signal RF is at a high level (ie, the binary 丨), the oscillation wheel ^ vQSC oscillates faster. Next, the detector 506 detects the detection signal Vrect according to the oscillation wheel output signal Vosc '. After that, the low-pass filter 508 will filter the detection signal Vrect to obtain the data signal Vu > f. Finally, the shaper 5 1 2 will shape the data signal VLPF and output the output data. From Fig. 10, it can be known that ‘the change of the radio frequency signal RF will cause a large change in the detection signal Vrect and the data signal VLPF, which will cause the common mode voltage of the data signal vlpf.

11222twfl Page 16 5. Description of the Invention (10) The changes are great. In this way, the detector 506, the low-pass filter 508, and the shaper 512 will be saturated, and the output data output by the shaper 512 will be wrong. Next, please refer to FIG. 11, which shows in green a waveform diagram of an ultra-self-excited RF receiver after using a common-mode feedback circuit according to a preferred embodiment of the present invention. The data receiving method of the ultra-self-excited radio frequency receiver 50 after using the common mode feedback circuit 510 will be described below with reference to FIG. 11. First, the sawtooth wave generator 502 generates a rest signal iq. Then, the vibrator 504 oscillates the oscillator output signal VQSC according to the radio frequency signal RF and the stop signal iq. Next, the common-mode feedback circuit 5 10 detects the common-mode voltage of the data signal vLpF and returns the common-mode feedback signal ICMFB. Next, the detector 506 ^ detects the detection signal vrect based on the oscillation output · signal Vosc, and adjusts the common mode voltage of the detection signal vrect according to the common mode feedback signal ICMFB. < After that, the low-pass filter 508 will filter the detection signal vreet to obtain the data signal VLPF. Finally, the shaper 512 shapes the data signal v ^ pF and outputs the output data. As can be seen from Figure 11, since the common mode voltage of the detection signal vrect is adjusted by the common mode feedback ICICMFB, the change of the common mode voltage of the detection signal vrect is relatively small, so the common mode voltage of the data signal Vlpf The change is also quite small 'so that the common-mode voltage of the data signal vLPF remains unchanged. Therefore, after the common mode feedback circuit 510 is made, the detector 506, the low-pass filter 508, and the shaper 512 will not be saturated, and the output data output by the shaper 512 will be correct. The self-excited radio frequency receiver 50 can improve sensitivity. Next, please refer to FIG. 12, which shows a preferred embodiment according to the present invention.

XL · Rev. 92113058 Λ__JL Revision V. Description of the invention (11) The actual analog waveform of the ultra-self-excited RF receiver of the embodiment. It can be seen from Figure 12 that the change of the data signal VLPF is quite small, so the common mode voltage of the data signal VLPF remains unchanged, so that the output data is correct. In summary, the present invention is to prevent the detector, low-pass filter, and shaper from being saturated by adding a common-mode feedback circuit and changing the detector to an integrating-detector with feedback. Therefore, the output signal output by the shaper will not generate errors, so the present invention can improve the sensitivity of the ultra-self-excited radio frequency receiver. 'Although the present invention has been disclosed in the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various changes and decorations without departing from the spirit and scope of the present invention. tThe scope of protection of the present invention shall be determined by the scope of the appended patent application.

11222twfl.ptc Page 18 I22228〇if b \ Day GO 7 ^ 91 * Repair: £ 4 No. 92113058 Λ__L · Brief description of the correction diagram Figure 1 shows the waveform diagram of the ON / OFF key modulation signal; Section 2 The figure shows a conventional block diagram of a super-self-excited RF receiver. Figure 3 shows the waveforms of the RF signal, the vibration-reduction signal, and the vibration output signal in Figure 1. The figure shows a conventional circuit block diagram of another ultra-self-excited radio frequency receiver; FIG. 5 shows a circuit block diagram of an ultra-self-excited radio frequency receiver according to a preferred embodiment of the present invention; FIG. 6 shows a circuit block diagram of a detector in an ultra-self-excited RF receiver according to a preferred embodiment of the present invention; FIG. 7 illustrates an ultra-self-excited according to a preferred embodiment of the present invention Detailed circuit diagram of a detector in a radio frequency receiver; FIG. 8 shows a circuit block diagram of a common mode feedback circuit in a super self-excited radio frequency receiver according to a preferred embodiment of the present invention; FIG. 9 Illustrated in a self-excited RF receiver of a self-excited radio frequency receiver according to a preferred embodiment of the present invention Detailed circuit diagram of common mode feedback circuit; Figure 10 shows the waveform diagram of the ultra-self-excited RF receiver before the mode feedback circuit according to a preferred embodiment of the present invention. Figure 11 shows a waveform diagram of an ultra-self-excited RF receiver after a mode feedback circuit according to a preferred embodiment of the present invention. Figure 12 shows a waveform diagram of a preferred embodiment according to the present invention. Real analog waveform diagram of a super self-excited RF receiver. Schematic description:

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JE_JL Brief description of the modified diagram 20, 40 202 204 206 208 210 402 406 412 414 502 506 510 602 604 606 702 710 802 804 906 Oscillator 9 0 8: Capacitor low-pass filter shaper 9 0 4: Transistor 50 : Ultra-self-excited RF receiver 404, 5 04: 212 ^ 70 8 > 408, 5 0 8: 410 '512: Resistance low noise amplifier envelope detector 4 1 6: Automatic gain control filter 418, 80 6 : Voltage to current converter sawtooth wave generator detector common mode feedback circuit reference current source current addition circuit virtual differential detector 704, 70 6, 902 discharge circuit comparison with amplifier feedback low pass wave current mirror

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Claims (1)

122228 ^ repair 6. A patent application scope 1. A super self-excited RF receiver, including: an oscillator for generating a vibration output signal based on a radio frequency signal and a rest signal; A detector is coupled to the oscillator to detect a detection signal based on the oscillating output signal; a low-pass filter is coupled to the detector to filter the detection signal to obtain a data signal And a common-mode feedback circuit, coupled to the low-pass filter and the detector, for detecting a common-mode voltage of the data signal, and returning a common-mode feedback signal to the detector, and the detector receives the Common-mode feedback signal to adjust the detection signal. 2. The ultra-self-excited RF receiver according to item 1 of the application and patent scope, wherein the common-mode feedback signal is a common-mode feedback current, and the detector includes: a reference current source for providing -A reference current; A current adding circuit coupled to the reference current source, the man adding the reference current to the common-mode feedback current to output an operating voltage; and a virtual differential detector coupled to the current addition A circuit for detecting the oscillating output signal to obtain the detection signal. The virtual differential detector uses the magnitude of the operating current to adjust the output level of the detection signal. 3. The ultra-self-excited RF receiver according to item 2 of the scope of patent application, wherein the detector further includes a discharge circuit coupled to the virtual differential detector to prevent the virtual differential detector from being contained therein. Its components are saturated. 11222twfl.ptc Page 21 11222twfl.ptc Page 22 I22Tr, J210 —— “Μ 9 ^ ΐϋ058- 土 月 b Chromium 1 VI. Apply for a patent ^”. After comparing and enlarging, output a comparison signal; and the factory feedback low-pass filter is coupled to the A comparison and amplifier is used to filter the comparison signal to obtain a feedback signal. 6gan = Ultra-self-excited RF receiver as described in item 5 of the patent application. The common-mode feedback signal is a common-mode feedback current, and the common-mode 4 crying circuit further includes an electric dust-to-current conversion. The converter is connected to the feedback low-pass filter to convert the feedback signal into the common-mode feedback current. The device is an ultra-self-excited RF receiver as described in item 5 of the patent application, wherein the comparison and amplifier operation is in a critical mode. 8. The ultra-self-excited radio frequency receiver according to item 5 of the patent claim, wherein the comparison and amplifier includes: accessing a first transistor, operating in the subcritical mode, the first of the first transistor The source / drain is coupled to one end of a current mirror, and the first gate is used to reduce the data load; U is a second transistor that operates in this subcritical mode. The first transistor is the first source / drain. A pole system is coupled to the other end of the current mirror. 'Read the comparison information. The gate system of the second transistor is coupled to the reference common mode pump, and the second source / drain system of the second transistor is coupled. Connected to the second source / drain of the first transistor. 9. The ultra-self-excited radio frequency receiver 'described in item 1 of the scope of the patent application further includes a sawtooth wave generator coupled to the oscillator for generating the rest signal. 10. The ultra-self-excited RF receiver according to item 1 of the scope of the patent application, further comprising a shaper coupled to the low-pass filter to shape the 11222twfl.ptc Page 23 Repair Λ 92 92 058 Λ_η Revision 6. Patent application scope Data signal, and output an output data. 11. The ultra-self-excited RF receiver according to item 1 of the scope of patent application, wherein the common-mode feedback signal is a common-mode feedback current. 1 2. The ultra-self-excited radio frequency receiver according to item 1 of the patent application scope, wherein the rest signal is a rest current signal. 13. —A data receiving method for an ultra-self-excited RF receiver for receiving a radio frequency signal to obtain a data signal. The data receiving method includes the following steps: 4 providing a break signal; according to the RF signal and the break The vibration signal oscillates an oscillating output signal; detects a common mode voltage of the data signal, and returns a common mode feedback signal; based on the oscillating output signal, a detection signal is detected, and according to the common mode feedback signal, Adjusting the detection signal; and > filtering the detection signal to obtain the data signal. 14. The data receiving method as described in item 13 of the scope of patent application, wherein the common mode feedback signal is a common mode feedback current, and the step of obtaining the detection signal includes the following steps: providing a reference current; The reference current is added to the common mode feedback current to output an operating current; and the oscillating output signal is detected to obtain the detection signal, and the magnitude of the detection signal is used to adjust the output level of the detection signal. 11222twfl.ptc Page 24 12222 80 flat 93. 1 92113058 Amendment VI. Patent application scope 15. The data receiving method described in item 13 of the patent application scope, wherein the common mode voltage of the data signal is detected and the common mode is returned. The steps of the mode feedback signal include the following steps: providing a reference common mode voltage; comparing and amplifying the data signal with the reference common mode voltage to output a comparison signal; and filtering the comparison signal to obtain a feedback signal . 16. The data receiving method according to item 15 of the scope of patent application, wherein the common mode feedback signal is a common mode feedback current, and the common mode voltage of the data signal is detected and the common mode feedback is feedbacked. The step of granting the signal further includes: converting the feedback signal into the common-mode feedback current. 11222twfl.ptc Page 25 1222280 View 4 β 11222TW