Frequency source device for modulating and demodulating DPSK signal based on TTL level

Abstract

The invention relates to a frequency source device for modulating and demodulating a DPSK (Differential Phase Shift Keying) signal based on a TTL (Transistor-Transistor Logic) level. The device comprises a frequency synthesis unit, a DPSK modulation and demodulation unit and a power supply control unit, the frequency synthesis unit is connected with the DPSK modulation-demodulation unit and provides carrier signals for the DPSK modulation-demodulation unit, and the power supply control unit is connected with the frequency synthesis unit and the DPSK modulation-demodulation unit; the power supply control unit controls the frequency synthesis unit to synthesize a carrier frequency by receiving an external communication and control signal, receives a frequency division monitoring signal generated by the frequency synthesis unit, and feeds back a distribution monitoring signal to the external communication and control; and providing the received external TTL level modulation DPSK signal to the DPSK modulation and demodulation unit for modulation, and feeding back the TTL level demodulation DPSK signal demodulated by the DPSK modulation and demodulation unit to the outside. According to the invention, the complexity of each unit due to separation is avoided, the manufacturing cost and the connection complexity are reduced, and the signal interference is reduced.

Description

Technical Field

[0001] The invention relates to the field of radio frequency communication, and in particular to a frequency source device based on TTL level modulation and demodulation of DPSK signals. Background Art

[0002] Digital phase modulation, also known as phase shift keying (PSK), is a very important basic digital modulation technology. It is also a modulation technology that uses the carrier phase to represent the input signal. In other words, PSK is a phase modulation method that switches the carrier phase between different values ​​according to the level of the digital baseband signal.

[0003] Differential Phase Shift Keying (DPSK) is a modulation method developed to overcome the phase ambiguity problem of the PSK system. It is a modulation format superior to PSK, providing higher receiving sensitivity and higher tolerance to nonlinear effects in high-speed transmission and crosstalk in coherent mixing transmission. Since the PSK system uses the absolute phase of the carrier to determine the modulated data, phase reversal is prone to occur during the signal transmission and demodulation process, and the original data cannot be accurately determined at the demodulation end. DPSK determines data information based on the phase difference between the previous and next data. Even if a phase reversal occurs at the receiving and demodulation end, the phase difference between the data will not change, so the problem caused by the phase reversal can be effectively solved. The DPSK modulator can convert amplitude modulation into phase modulation, and the DPSK demodulator can convert phase modulation into amplitude modulation, so that conventional intensity detectors can monitor DPSK signals.

[0004] Adjustment can be achieved by changing the amplitude, phase or frequency of the high-frequency carrier as the signal amplitude changes. At present, it is mostly used in the front end of the transmitter power amplifier in the field of RF communication. After the modulation signal is modulated with the high-frequency carrier signal, it is amplified by the power amplifier of the subsequent stage and then transmitted through the antenna. In the existing application fields, the overall system is often connected in modules, which has a large volume, and the signals between modules are easily interfered and have high losses. The modulation and demodulation process usually relies on the digital circuit carrier frequency for modulation and demodulation and is mostly used for amplitude or envelope modulation. For signals with higher transmission frequencies, the modulation signal needs to be modulated with the low-frequency carrier and then up-converted to a higher frequency band before it can be transmitted. For signals that require phase modulation, modulation and demodulation are more complicated. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a frequency source device for modulating and demodulating DPSK signals based on TTL level, thereby solving the shortcomings of the prior art.

[0006] The object of the present invention is achieved by the following technical scheme: a frequency source device based on TTL level modulation and demodulation of DPSK signal, the device comprising a frequency synthesis unit, a differential phase shift keying modulation and demodulation unit and a power control unit; the frequency synthesis unit is connected to the differential phase shift keying modulation and demodulation unit to provide a carrier signal therefor, and the power control unit is connected to the frequency synthesis unit and the differential phase shift keying modulation and demodulation unit to provide power and control signals therefor; The power control unit controls the frequency synthesis unit to synthesize the carrier frequency by receiving external communication and control signals, receives the frequency division monitoring signal generated by the frequency synthesis unit, and feeds back the distribution monitoring signal to the external communication and control; and provides the received external TTL level modulated DPSK signal to the differential phase shift keying modulation and demodulation unit for modulation, and feeds back the TTL level demodulated DPSK signal demodulated by the differential phase shift keying modulation and demodulation unit to the outside.

[0007] The frequency synthesis unit includes a clock unit, a frequency source unit, a radio frequency unit and a frequency division monitoring unit; the output end of the clock unit is connected to the input end of the frequency source unit, and the output end of the frequency source unit is connected to the input end of the radio frequency unit; The radio frequency unit includes two radio frequency signals, one of which enters the frequency division monitoring unit in sequence to generate a signal to the power control unit, and the other enters the differential phase shift keying modulation and demodulation unit in sequence to provide a carrier signal to the differential phase shift keying modulation and demodulation unit.

[0008] The differential phase shift keying modulation and demodulation unit comprises a modulation unit, a coupling detection unit and a demodulation unit which are connected in sequence; the demodulation unit is connected to the power control unit; The modulation unit receives the carrier signal from the frequency synthesis unit and the TTL level modulation and demodulation DPSK signal from the power control unit, performs phase modulation in the adjustment unit, obtains the detection signal of the phase modulated carrier signal through the coupling detection unit and monitors the signal strength, sends the detection signal to the demodulation unit for phase demodulation, and finally provides the demodulated TTL level signal to the power control unit.

[0009] The power control unit comprises a power supply unit, a communication drive unit and a digital control unit; the power input is connected to the power supply unit, the power supply unit is connected to the frequency synthesis unit and the differential phase shift keying modulation and demodulation unit, the external communication and control and TTL level modulation and demodulation DPSK signals are connected to the communication drive unit, the communication drive unit is connected to the digital control unit and the differential phase shift keying modulation and demodulation unit, and the digital control unit is connected to the frequency source unit and the frequency division monitoring unit; The frequency setting signal of external communication and control is input to the communication driving unit, and the communication driving unit transmits the signal to the digital control unit. After receiving the frequency setting signal, the digital control unit converts the frequency setting signal into a frequency configuration signal of the frequency synthesizer in the frequency source unit, thereby realizing the frequency conversion function of the frequency synthesis unit, and at the same time receives the frequency division monitoring signal of the demodulation unit and the frequency division monitoring unit for signal feedback.

[0010] The radio frequency unit includes two radio frequency signals, both of which are composed of an attenuator, an amplifier and a filter. One of them is input to the frequency division monitoring unit, and the other is input to the differential phase shift keying modulation and demodulation unit; the power of the carrier signal is controlled by the attenuator, the amplifier amplifies the carrier signal and suppresses harmonics, and the filter filters out the stray signals generated by the signal source to improve the purity of the subsequent output carrier signal.

[0011] The frequency division monitoring unit includes a power divider, an attenuator, a frequency divider and a D flip-flop; the output end of the power divider is respectively connected to the attenuator and the frequency divider, and the output end of the frequency divider is connected to the D flip-flop; the radio frequency unit inputs the input carrier signal into the power divider, and the power divider divides the carrier signal into two signals, one of which is output to the frequency division monitoring unit through the attenuator for monitoring, and the other enters the frequency divider to divide the carrier signal and output it to the digital control unit through the D flip-flop.

[0012] The frequency synthesis unit, differential phase shift keying modulation and demodulation unit, and power supply control unit are integrated on a circuit board or in a module.

[0013] The present invention has the following advantages: a frequency source device based on TTL level modulation and demodulation of DPSK signals, proposes an architecture based on TTL level modulation and demodulation of DPSK signals to solve the problem of phase modulation and phase demodulation of carrier and TTL level DPSK signals, adopts an integrated design to avoid the complication of each unit due to separation, reduces manufacturing cost and connection complexity, reduces signal interference, solves the problem of phase modulation and phase demodulation of carrier and DPSK signals, has a simple principle, a simple and efficient solution, and has strong application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of a frequency synthesis unit; Figure 3 It is a structural schematic diagram of a differential phase shift keying modulation and demodulation unit; Figure 4 is a schematic diagram of the structure of a power control unit; Figure 5 is a schematic diagram of the structure of a radio frequency unit; Figure 6 It is a structural diagram of the frequency division monitoring unit; Figure 7 It is a structural diagram of the modulation unit, the coupling detection unit and the demodulation unit. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present application provided below in conjunction with the drawings is not intended to limit the scope of protection of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application. The present invention is further described below in conjunction with the drawings.

[0016] like Figure 1 As shown, the present invention specifically relates to a frequency source device based on TTL level modulation and demodulation of DPSK signals, which solves the problems of low integration degree between frequency synthesis unit and differential phase shift keying (DPSK) modulation and demodulation unit, large volume, complex connection, and phase modulation and phase demodulation of carrier and TTL level DPSK signal. It includes a frequency synthesis unit, a differential phase shift keying (DPSK) modulation and demodulation unit, a power control unit, external communication and control, external power input, external TTL level modulation and demodulation of DPSK signal, the frequency synthesis unit is sequentially connected to the differential phase shift keying (DPSK) modulation and demodulation unit, and the frequency synthesis unit, the differential phase shift keying (DPSK) modulation and demodulation unit, and the power control unit are integrated on a circuit board or in a module.

[0017] Furthermore, the power control unit is connected to the frequency synthesis unit, the differential phase shift keying (DPSK) modulation and demodulation unit, the power input, the communication and control, and the TTL level modulation and demodulation DPSK signal; the frequency synthesis unit is connected to the differential phase shift keying (DPSK) modulation and demodulation unit, and the frequency synthesis unit provides a carrier signal for the differential phase shift keying (DPSK) modulation and demodulation unit.

[0018] The power control unit is connected to external communication and control, external TTL level modulation and demodulation DPSK signal and external power input, and is also connected to the frequency synthesis unit and the differential phase shift keying (DPSK) modulation and demodulation unit to provide power and control signals for the frequency synthesis unit and the differential phase shift keying (DPSK) modulation and demodulation unit.

[0019] The power control unit controls the carrier frequency synthesized by the frequency synthesis unit through the received communication and control signal, receives the frequency division monitoring signal generated by the frequency synthesis unit, and feeds the frequency division monitoring signal back to the communication and control.

[0020] The power control unit provides the received TTL level modulated DPSK signal to the differential phase shift keying (DPSK) modulation and demodulation unit for modulation, and feeds back the TTL level demodulated DPSK signal demodulated by the differential phase shift keying (DPSK) modulation and demodulation unit to the outside. The power control unit connects each unit, controls and receives the frequency synthesis and modulation and demodulation of each unit, so that the entire architecture can operate in a coordinated manner.

[0021] Furthermore, if Figure 2 As shown, the frequency synthesis unit includes a clock unit, a frequency source unit, a radio frequency unit, and a frequency division monitoring unit; the clock unit includes a constant temperature crystal oscillator, the frequency source unit includes a frequency synthesizer, and the radio frequency unit includes two radio frequency signals, one of which enters the frequency division monitoring unit in sequence, and the other enters the differential phase shift keying (DPSK) modulation and demodulation unit in sequence, and the frequency division monitoring unit generates a digital control signal. The core function of this unit is mainly to realize the synthesis of carrier frequency, provide accurate and convenient carrier signals to the differential phase shift keying (DPSK) modulation and demodulation unit, and modify the frequency within a certain frequency range according to the control signal of the power control unit to complete the synthesis function of the frequency source.

[0022] Furthermore, if Figure 3 As shown, the differential phase shift keying (DPSK) modulation and demodulation unit includes a modulation unit, a coupling detection unit, and a demodulation unit; the modulation unit is connected to the coupling detection unit and the power control unit; the coupling detection unit is connected to the demodulation unit; and the demodulation unit is connected to the power control unit. The core function of this unit is mainly to realize that the modulation unit receives the carrier signal from the radio frequency unit, the TTL level from the power control unit modulates and demodulates the DPSK signal, performs phase modulation in the modulation unit, and the signal strength of the phase-modulated carrier signal can be monitored through the coupling detection unit, and the detection signal is sent to the demodulation unit to realize phase demodulation, and the demodulated TTL level signal is provided to the digital control unit of the power control unit.

[0023] Furthermore, if Figure 4As shown, the power control unit includes a power supply unit, a communication drive unit, and a digital control unit; the power input is connected to the power supply unit; the power supply unit is connected to each unit and provides the required power for each unit; the communication and control and TTL level modulation and demodulation DPSK signals are connected to the communication drive unit; the communication drive unit is connected to the digital control unit and the differential phase shift keying (DPSK) modulation and demodulation unit, and the digital control unit is connected to the frequency source unit and the frequency division monitoring unit. The power supply unit includes DCDC and LDO in sequence, the communication drive unit includes drive, NOT gate, and AND gate in sequence, and the digital control unit includes a single-chip microcomputer, a crystal oscillator, and a non-volatile memory. The core function of this unit is mainly to realize the exchange and transmission of internal and external signals. The power supply is input to the power supply unit, and the power supply unit provides stable and low-noise power to each unit in the architecture; the frequency setting signal of communication and control is input to the communication drive unit, and the communication drive unit transmits the signal to the digital control unit. After receiving the frequency setting signal, the digital control unit converts the frequency setting signal into the frequency configuration signal of the frequency synthesizer in the frequency source unit to realize the frequency conversion function of the frequency synthesis unit; at the same time, the frequency division monitoring signal of the demodulation unit and the frequency division monitoring unit is received to transmit the signal back.

[0024] Furthermore, if Figure 5 As shown, the RF unit includes two RF signals, one of which includes an attenuator, an amplifier, and a filter in sequence and enters the frequency division monitoring unit, and the other includes an attenuator, an amplifier, and a filter in sequence and enters the differential phase shift keying (DPSK) modulation and demodulation unit. The connection order of the attenuator, the amplifier, and the filter in the RF unit can be changed, and the number of each device can be increased or decreased according to actual conditions. The core function of this unit is mainly to realize the power control and signal purity of the carrier signal output by the frequency source. The attenuator controls the power of the carrier signal, the amplifier amplifies the carrier signal and suppresses harmonics, and the filter filters out the spurious signal generated by the signal source, thereby improving the purity of the subsequent output carrier signal.

[0025] Furthermore, if Figure 6 As shown, the frequency division monitoring unit includes a power divider, an attenuator, a frequency divider and a D flip-flop in sequence; the frequency division monitoring unit can be retained or deleted according to the actual situation. The core function of this unit is mainly to realize the frequency division and monitoring function of the carrier signal. The RF unit inputs the input carrier signal to the power divider, and the power divider divides the carrier signal into two signals. One signal passes through the attenuator and is output for monitoring, and the other signal enters the frequency divider to divide the carrier signal and is output to the digital control unit through the D flip-flop.

[0026] Furthermore, if Figure 7As shown, the modulation unit includes RF switch, phase-shift microstrip, RF switch, NOT gate, and voltage regulator diode in sequence, the coupling detection unit includes coupler and detector in sequence, and the demodulation unit includes operational amplifier and NOT gate in sequence. The core function of this unit is mainly to realize the modulation and demodulation of DPSK signal based on TTL level; the RF unit provides the carrier signal to the RF switch of the modulation unit, the communication drive unit inputs the TTL level DPSK into the voltage regulator diode, the voltage regulator diode controls the output level of the NOT gate, and the level controls the selection of the phase-shift microstrip of the two groups of RF switches, controls the phase of the carrier signal through the phase-shift microstrip, and modulates the information in the DPSK signal into the carrier signal.

[0027] The coupled signal is detected through the coupling detection unit on one of the branches, and the detection level is output. The detection level is changed by changing the carrier signal power on the phase-shifted microstrip when modulating the RF switch. The detection frequency is input to the comparator with a set threshold voltage for comparison, and the demodulated DPSK signal of the TTL level can be effectively output. In order to keep the phase consistent, the output TTL level DPSK signal is input into the NOT gate, which can keep the phase of the modulated signal consistent with that of the demodulated signal. The coupling detection circuit after the RF switch can couple the output modulated signal for detection, realize signal strength monitoring, and output the detection level to the digital control unit to realize signal feedback.

[0028] Furthermore, the frequency division monitoring unit of the present invention can be retained or deleted according to actual conditions, the connection sequence of the attenuator, amplifier and filter in the radio frequency unit can be changed, and the number of each component can be increased or decreased according to actual conditions.

[0029] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used for various other combinations, modifications and improvements, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A frequency source device for modulating and demodulating DPSK signals based on TTL level, characterized in that: The device comprises a frequency synthesis unit, a differential phase shift keying modulation and demodulation unit and a power control unit; the frequency synthesis unit is connected to the differential phase shift keying modulation and demodulation unit to provide a carrier signal thereto, and the power control unit is connected to the frequency synthesis unit and the differential phase shift keying modulation and demodulation unit to provide power and control signals thereto; The power control unit controls the frequency synthesis unit to synthesize the carrier frequency by receiving external communication and control signals, receives the frequency division monitoring signal generated by the frequency synthesis unit, and feeds back the distribution monitoring signal to the external communication and control; and provides the received external TTL level modulated DPSK signal to the differential phase shift keying modulation and demodulation unit for modulation, and feeds back the TTL level demodulated DPSK signal demodulated by the differential phase shift keying modulation and demodulation unit to the outside.

2. A frequency source device based on TTL level modulation and demodulation of DPSK signal according to claim 1, characterized in that: The frequency synthesis unit includes a clock unit, a frequency source unit, a radio frequency unit and a frequency division monitoring unit; the output end of the clock unit is connected to the input end of the frequency source unit, and the output end of the frequency source unit is connected to the input end of the radio frequency unit; The radio frequency unit includes two radio frequency signals, one of which enters the frequency division monitoring unit in sequence to generate a signal to the power control unit, and the other enters the differential phase shift keying modulation and demodulation unit in sequence to provide a carrier signal to the differential phase shift keying modulation and demodulation unit.

3. The frequency source device based on TTL level modulation and demodulation of DPSK signal according to claim 1, characterized in that: The differential phase shift keying modulation and demodulation unit comprises a modulation unit, a coupling detection unit and a demodulation unit which are connected in sequence; the demodulation unit is connected to the power control unit; The modulation unit receives the carrier signal from the frequency synthesis unit and the TTL level modulation and demodulation DPSK signal from the power control unit, performs phase modulation in the adjustment unit, obtains the detection signal of the phase modulated carrier signal through the coupling detection unit and monitors the signal strength, sends the detection signal to the demodulation unit for phase demodulation, and finally provides the demodulated TTL level signal to the power control unit.

4. The frequency source device based on TTL level modulation and demodulation of DPSK signal according to claim 2, characterized in that: The power control unit comprises a power supply unit, a communication drive unit and a digital control unit; the power input is connected to the power supply unit, the power supply unit is connected to the frequency synthesis unit and the differential phase shift keying modulation and demodulation unit, the external communication and control and TTL level modulation and demodulation DPSK signals are connected to the communication drive unit, the communication drive unit is connected to the digital control unit and the differential phase shift keying modulation and demodulation unit, and the digital control unit is connected to the frequency source unit and the frequency division monitoring unit; The frequency setting signal of external communication and control is input to the communication driving unit, and the communication driving unit transmits the signal to the digital control unit. After receiving the frequency setting signal, the digital control unit converts the frequency setting signal into a frequency configuration signal of the frequency synthesizer in the frequency source unit, thereby realizing the frequency conversion function of the frequency synthesis unit, and at the same time receives the frequency division monitoring signal of the demodulation unit and the frequency division monitoring unit for signal feedback.

5. The frequency source device based on TTL level modulation and demodulation of DPSK signal according to claim 2, characterized in that: The radio frequency unit includes two radio frequency signals, both of which are composed of an attenuator, an amplifier and a filter. One of them is input to the frequency division monitoring unit, and the other is input to the differential phase shift keying modulation and demodulation unit; the power of the carrier signal is controlled by the attenuator, the amplifier amplifies the carrier signal and suppresses harmonics, and the filter filters out the stray signals generated by the signal source to improve the purity of the subsequent output carrier signal.

6. The frequency source device based on TTL level modulation and demodulation of DPSK signal according to claim 2, characterized in that: The frequency division monitoring unit includes a power divider, an attenuator, a frequency divider and a D flip-flop; the output end of the power divider is respectively connected to the attenuator and the frequency divider, and the output end of the frequency divider is connected to the D flip-flop; the radio frequency unit inputs the input carrier signal into the power divider, and the power divider divides the carrier signal into two signals, one of which is output through the attenuator for monitoring, and the other enters the frequency divider to divide the carrier signal and output it to the digital control unit through the D flip-flop.

7. A frequency source device based on TTL level modulation and demodulation of DPSK signal according to any one of claims 1 to 6, characterized in that: The frequency synthesis unit, differential phase shift keying modulation and demodulation unit, and power supply control unit are integrated on a circuit board or in a module.

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