Phase-locked loop applied to satellite-borne communication chip

Abstract

The invention belongs to the technical field of integrated circuits, and particularly relates to an anti-radiation phase-locked loop applied to a satellite-borne wireless communication system. The circuit structure comprises an anti-radiation phase-locked loop core circuit, a power detection circuit, an analog-to-digital converter and a control module. An input signal is input to the anti-radiation phase-locked loop core circuit, and a frequency signal is generated and output to the power detection circuit. The power detection circuit processes the received frequency signal, outputs a processing result to the analog-to-digital converter, receives an instruction of the control module circuit and outputs a final signal; the analog-to-digital converter converts a processing result output by the power detection circuit into a digital signal and outputs the digital signal to the control module; and the control module performs judgment according to the input digital signal, generates a control signal for controlling the working mode of the anti-radiation phase-locked loop core circuit, and generates a control signal for controlling the power detection circuit and the analog-to-digital converter. Wherein the core circuit architecture of the anti-radiation phase-locked loop is two charge pump phase-locked loops, and the actually working phase-locked loop branches are switched through a switch. By utilizing the structure, the probability of circuit failure caused by space irradiation can be obviously reduced, and the anti-irradiation performance and the stability of a satellite-borne wireless communication system are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated circuits, and particularly relates to a phase-locked loop. Background Art

[0002] A phase-locked loop is a control system widely used in electronic communication and signal processing, and its main function is to output a signal with the same phase as the reference signal.

[0003] Currently, the mainstream architectures of phase-locked loops include traditional analog phase-locked loops, digital phase-locked loops, and charge pump phase-locked loops. Among them, the charge pump phase-locked loop can not only use the continuous control voltage provided by the charge pump to achieve more precise phase and frequency regulation, but also has many advantages such as low phase noise, high flexibility, high energy utilization efficiency, and easy integration into digital systems. Therefore, when the application environment is the strongly irradiated space, the charge pump phase-locked loop is more suitable than phase-locked loops of other architectures.

[0004] With the progress of technology and the continuous expansion of the communication application field, people have put forward more requirements for phase-locked loop circuits. In the aerospace field, the working environment of on-board chips is the strongly irradiated space, and the circuit modules in the chips are affected by irradiation, having a higher failure probability and a shorter expected life. Therefore, to improve the performance of on-board chips, it is necessary to effectively utilize chip anti-irradiation technology to improve system stability and reliability. Summary of the Invention

[0005] The purpose of the present invention is to propose an anti-irradiation charge pump phase-locked loop applied to on-board communication chips.

[0006] The phase-locked loop circuit structure proposed by the present invention includes: an anti-irradiation phase-locked loop core circuit, a power detection circuit, an analog-to-digital converter, and a control module; an input signal is input to the anti-irradiation phase-locked loop core circuit, generates a frequency signal and outputs it to the power detection circuit; the power detection circuit processes the signals it receives from the anti-irradiation phase-locked loop core and the control module circuit, outputs the processing result to the analog-to-digital converter and outputs the final frequency signal; the analog-to-digital converter converts the processing result output by the power detection circuit into a digital signal and outputs it to the control module circuit; the control module circuit will make a judgment according to the received signal and generate control signals for controlling the anti-irradiation phase-locked loop core circuit, the power detection circuit, and the analog-to-digital converter.

[0007] In the present invention, the anti-irradiation phase-locked loop core circuit consists of two identical charge pump phase-locked loops and two single-pole double-throw numerically controlled switches; the two charge pump phase-locked loops are backup to each other and are controlled by the numerically controlled switches. Only one phase-locked loop is used during actual normal operation; the numerically controlled switch will switch the actually working phase-locked loop branch according to the signal of the control module in the system, thereby greatly improving the anti-irradiation performance and stability of the system. Description of the Drawings

[0008] Figure 1 This is a schematic diagram of the anti-radiation phase-locked loop structure of the present invention.

[0009] Figure 2 This is a schematic diagram of the core circuit of the anti-radiation phase-locked loop. Detailed implementation manners

[0010] The present invention will be described in more detail with reference to the accompanying drawings. In the respective drawings, like elements are denoted by like reference numerals. For clarity, the various parts in the drawings are not drawn to scale. In addition, some well-known parts may not be shown in the figures.

[0011] In the following, many specific details of the present invention are described, such as the structure, materials, dimensions, processing techniques and technologies of the device, so as to understand the present invention more clearly. However, as those skilled in the art can understand, the present invention can be implemented without these specific details.

[0012] Figure 1 This shows a schematic diagram of the spaceborne anti-radiation phase-locked loop of the present invention.

[0013] As Figure 1 shown, the spaceborne anti-radiation phase-locked loop 100 in the present invention includes an anti-radiation phase-locked loop core circuit 101, a power detection circuit 102, a control module 103, and an analog-to-digital converter 104. The external input signal f ref serves as the input signal of the anti-radiation phase-locked loop core circuit 101, and the output signal f out of the anti-radiation phase-locked loop core circuit 101 is transmitted to the power detection circuit 102, and the power detection circuit 102 outputs f outo as the output signal of the entire phase-locked loop circuit. The power detection circuit 102 outputs pdout to the analog-to-digital converter 104, the analog-to-digital converter 104 outputs adout to the control module 103, and the control module 103 outputs Ctrl<1:2> to the anti-radiation phase-locked loop core circuit 101, outputs Ctrl3 to the power detection circuit 102, and outputs Ctrl4 to the analog-to-digital converter 104.

[0014] Figure 2 This shows a schematic diagram of the anti-radiation phase-locked loop core circuit in the present invention.

[0015] As Figure 2As shown in the figure, the core circuit of the radiation-resistant phase-locked loop includes two numerically controlled switches S1 and S2 and two backup branches; the first branch includes a phase-frequency detector 201, a charge pump 202, a loop filter 203, a voltage-controlled oscillator 204, and a frequency divider 205, and the second branch includes a phase-frequency detector 206, a charge pump 207, a loop filter 208, a voltage-controlled oscillator 209, and a frequency divider 210; when the core circuit of the radiation-resistant phase-locked loop receives a control signal to select the first branch, switch S1 is connected to the fixed terminal 1.1, and switch S2 is connected to the fixed terminal 2.1; when receiving a control signal to select the second branch, switch S1 is connected to the fixed terminal 1.2, and switch S2 is connected to the fixed terminal 2.2; the input signal is connected to the moving terminal of switch S1, and the output signal is connected to the moving terminal of switch S2; in the first branch, the fixed terminal 1.1 of switch S1 is connected to the phase-frequency detector 201, the signal receiving ends of the phase-frequency detector 201 are respectively connected to the fixed terminal 1.1 of switch S1 and the frequency divider 205, the phase-frequency detector 201 outputs two forms of signals and the output terminal is connected to the charge pump 202, the signal receiving end of the charge pump 202 receives the two forms of signals output by the phase-frequency detector 201 and the output terminal is connected to the signal receiving end of the loop filter 203, the output terminal of the loop filter 203 is connected to the signal receiving end of the voltage-controlled oscillator 204, the output terminal of the voltage-controlled oscillator 204 is connected to the signal receiving end of the frequency divider 205, and the output terminal of the frequency divider 205 is connected to the signal receiving end of the phase-frequency detector 201; in the second branch, the fixed terminal 1.2 of switch S2 is connected to the phase-frequency detector 206, the signal receiving ends of the phase-frequency detector 206 are respectively connected to the fixed terminal 1.2 of switch S2 and the frequency divider 210, the phase-frequency detector 206 outputs two forms of signals and the output terminal is connected to the charge pump 207, the signal receiving end of the charge pump 207 receives the two forms of signals output by the phase-frequency detector 206 and the output terminal is connected to the signal receiving end of the loop filter 208, the output terminal of the loop filter 208 is connected to the signal receiving end of the voltage-controlled oscillator 209, the output terminal of the voltage-controlled oscillator 209 is connected to the signal receiving end of the frequency divider 210, and the output terminal of the frequency divider 210 is connected to the signal receiving end of the phase-frequency detector 206. The core of this circuit structure is that the control signal can change the states of switches S1 and S2, and the two branches in the core circuit are backup to each other and actually only one branch works. When space radiation causes one of the working branches to fail, the control signal can change the switch state to make the actually working circuit switch to the circuit of the other branch, thereby greatly improving the stability and reliability of the system.

Claims

1. A phase-locked loop applied to a spaceborne communication chip, the circuit structure of which includes: Anti-radiation phase-locked loop core circuit, power detection circuit, analog-to-digital converter and control module. The input signal is input to the anti-radiation phase-locked loop core circuit, and a frequency signal is generated and output to the power detection circuit; the power detection circuit processes the received frequency signal, outputs the processing result to the analog-to-digital converter, and receives the instruction of the control module circuit to output the final signal; The analog-to-digital converter converts the processing result output by the power detection circuit into a digital signal and outputs it to the control module; the control module makes a judgment according to the input digital signal, generates a control signal for controlling the working mode of the anti-radiation phase-locked loop core circuit, and generates control signals for controlling the power detection circuit and the analog-to-digital converter.

2. The phase-locked loop applied to the spaceborne communication chip according to claim 1, wherein The anti-radiation phase-locked loop core circuit consists of two identical charge pump phase-locked loops and two single-pole double-throw digital control switches; the two charge pump phase-locked loops are backup to each other and are controlled by the digital control switches. Only one phase-locked loop is used during actual normal operation; the digital control switch switches the actually working phase-locked loop branch according to the signal of the control module in the system, thereby greatly improving the anti-radiation performance and stability of the system.

3. The phase-locked loop applied to the spaceborne communication chip according to claim 2, wherein The core circuit of the radiation-resistant phase-locked loop includes two numerically controlled switches S1, S2 and two backup branches; the first branch includes a frequency discriminator and phase detector 201, a charge pump 202, a loop filter 203, a voltage-controlled oscillator 204 and a frequency divider 205, and the second branch includes a frequency discriminator and phase detector 206, a charge pump 207, a loop filter 208, a voltage-controlled oscillator 209 and a frequency divider 210; when the core circuit of the radiation-resistant phase-locked loop receives a control signal to select the first branch, the switch S1 is connected to the fixed terminal 1.1, and the switch S2 is connected to the fixed terminal 2.1; when it receives a control signal to select the second branch, the switch S1 is connected to the fixed terminal 1.2, and the switch S2 is connected to the fixed terminal 2.2; the input signal is connected to the moving terminal of the switch S1, and the output signal is connected to the moving terminal of the switch S2; in the first branch, the fixed terminal 1.1 of the switch S1 is connected to the frequency discriminator and phase detector 201, the signal receiving ends of the frequency discriminator and phase detector 201 are respectively connected to the fixed terminal 1.1 of the switch S1 and the frequency divider 205, the frequency discriminator and phase detector 201 outputs two forms of signals and the output end is connected to the charge pump 202, the signal receiving end of the charge pump 202 receives the two forms of signals output by the frequency discriminator and phase detector 201 and the output end is connected to the signal receiving end of the loop filter 203, the output end of the loop filter 203 is connected to the signal receiving end of the voltage-controlled oscillator 204, the output end of the voltage-controlled oscillator 204 is connected to the signal receiving end of the frequency divider 205, and the output end of the frequency divider 205 is connected to the signal receiving end of the frequency discriminator and phase detector 201; in the second branch, the fixed terminal 1.2 of the switch S2 is connected to the frequency discriminator and phase detector 206, the signal receiving ends of the frequency discriminator and phase detector 206 are respectively connected to the fixed terminal 1.2 of the switch S2 and the frequency divider 210, the frequency discriminator and phase detector 206 outputs two forms of signals and the output end is connected to the charge pump 207, the signal receiving end of the charge pump 207 receives the two forms of signals output by the frequency discriminator and phase detector 206 and the output end is connected to the signal receiving end of the loop filter 208, the output end of the loop filter 208 is connected to the signal receiving end of the voltage-controlled oscillator 209, the output end of the voltage-controlled oscillator 209 is connected to the signal receiving end of the frequency divider 210, and the output end of the frequency divider 210 is connected to the signal receiving end of the frequency discriminator and phase detector 206. The core of this circuit structure is that the control signal can change the states of the switches S1 and S2, and the two branches in the core circuit are backup to each other and actually only one branch works. When space radiation causes one of the working branches to fail, the control signal can change the switch states to make the actual working circuit switch to the circuit of the other branch, thus greatly improving the stability and reliability of the system.

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