Phase frequency detector applied to satellite-borne communication chip

Abstract

The invention belongs to the technical field of integrated circuits, and particularly relates to a phase frequency detector applied to a satellite-borne wireless communication system. The circuit structure of the phase frequency detector comprises an anti-radiation phase frequency detector core circuit, a power detection circuit, an analog-to-digital converter and a control module circuit, an input signal is input to the anti-radiation phase frequency detector core circuit, and an output signal is generated and output to the power detection circuit. The power detection circuit processes the received signal, outputs a processing result to the analog-to-digital converter, receives an instruction of the control module circuit and generates an output signal of the whole circuit; 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 circuit; the control module circuit performs judgment according to the input digital signal, generates a control signal for controlling the working mode of the anti-radiation phase frequency detector core circuit, and generates a control signal for controlling the power detection circuit and the analog-to-digital converter; the radiation-proof phase frequency detector core circuit is composed of four identical phase frequency detector branches, a logic gate circuit and six numerical control single-pole double-throw switches. The two paths of phase frequency detector branches connected with the same input signal can be switched under the control of the numerical control switch, and by applying the structure, the circuit failure probability caused by space irradiation can be remarkably reduced, and the anti-irradiation performance and the stability of the circuit are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated circuits, and particularly relates to a frequency discriminator and phase detector. Background Art

[0002] A frequency synthesizer is an indispensable module in a radio frequency transceiver system, mainly providing an approximate ideal local oscillator signal for a mixer. In a charge pump phase-locked loop frequency synthesizer, a frequency discriminator and phase detector mainly discriminates the signal relationship between a reference frequency and a feedback signal, and is a key module of the overall loop, playing a decisive role in loop accuracy and frequency capture range.

[0003] The main structures of a frequency discriminator and phase detector include a traditional type, a pre-charge type, a non-clock type, a differential input type, a non-linear type, and an edge-triggered type. Among them, the edge-triggered frequency discriminator and phase detector can achieve a full-phase ideal phase discrimination range, which is suitable for application scenarios that require a large phase discrimination range.

[0004] At present, the increasingly widespread communication application fields have put forward more requirements for phased array transceiver systems and frequency discriminator and phase detector circuits. In the aerospace field, the working environment of spaceborne chips is the strongly irradiated space. The circuit modules in the chips are affected by irradiation, having a higher failure probability and a shorter expected life. Therefore, it is imperative to pay attention to the special working environment of spaceborne chips in the aerospace field, study chip anti-irradiation technology, and improve system stability and reliability. Summary of the Invention

[0005] The purpose of the present invention is to propose an anti-irradiation frequency discriminator and phase detector applied to a spaceborne communication chip.

[0006] The frequency discriminator and phase detector proposed by the present invention has a circuit structure including: an anti-irradiation frequency discriminator and phase detector core circuit, a power detection circuit, an analog-to-digital converter, and a control module circuit; an input signal is input to the anti-irradiation frequency discriminator and phase detector core circuit, and an output signal is generated and output to the power detection circuit; the power detection circuit processes the signal it receives, outputs a processing result to the analog-to-digital converter, and receives an instruction from the control module circuit to generate an output signal of the overall circuit; 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 makes a judgment based on the input digital signal, generates a control signal for controlling the working mode of the anti-irradiation frequency discriminator and phase detector core circuit, and generates control signals for controlling the power detection circuit and the analog-to-digital converter.

[0007] In the present invention, the anti-irradiation frequency discriminator and phase detector core circuit is composed of four frequency discriminator and phase detector branches and 6 numerically controlled single-pole double-throw switches; the circuit structures of the four frequency discriminator and phase detector branches are exactly the same, and are composed of D flip-flops and digital logic circuits.

[0008] The frequency discriminator and phase detector designed by the present invention generally includes four branches of frequency discriminator and phase detector and a logic gate circuit. Among them, the two branches of frequency discriminator and phase detector connected to the same input signal are backup to each other, and can be switched by changing the connection state of the single-pole double-throw switch under the control of the system, so as to effectively reduce the failure probability of the overall circuit and improve the anti-radiation performance and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic structural diagram of the anti-radiation frequency discriminator and phase detector of the present invention.

[0010] Figure 2 It is a schematic diagram of the core circuit of the anti-radiation frequency discriminator and phase detector. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention will be described in more detail below with reference to the drawings. In the respective drawings, the same elements are denoted by like reference numerals. For the sake of 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.

[0012] Many specific details of the present invention are described below, such as the structure, materials, dimensions, processing techniques and technologies of the devices, in order to understand the present invention more clearly. However, as those skilled in the art can understand, the present invention may be implemented without these specific details.

[0013] Figure 1 It shows a schematic structural diagram of the spaceborne anti-radiation frequency discriminator and phase detector of the present invention.

[0014] As Figure 1 shown, the spaceborne anti-radiation frequency discriminator and phase detector 100 in the present invention includes an anti-radiation frequency discriminator and phase detector core circuit 101, a power detection circuit 102, a control module 103, and an analog-to-digital converter 104. The power supply voltage VDD is connected to the anti-radiation frequency discriminator and phase detector core circuit 101, the input signal REF and DIV are input to the anti-radiation frequency discriminator and phase detector core circuit 101, the anti-radiation frequency discriminator and phase detector core circuit 101 outputs ubp, up, dnb, dn and transmits them to the power detection circuit 102, the output ubpo, upo, dnbo, dno of the power detection circuit 102 are used as the output signals of the entire frequency discriminator and phase detector circuit, the power detection circuit 102 outputs pdout and transmits it to the analog-to-digital converter 104, the analog-to-digital converter 104 outputs adout and transmits it to the control module 103, the control module 103 outputs Ctrl<1-6> and transmits them to the anti-radiation frequency discriminator and phase detector core circuit 101, the control module 103 outputs Ctrl7 and transmits it to the power detection circuit 102, and the control module 103 outputs Ctrl8 and transmits it to the analog-to-digital converter 104.

[0015] Figure 2Shows the schematic diagram of the core circuit of the anti-radiation frequency discriminator and phase detector in the present invention.

[0016] As Figure 2 shown, the core circuit of the anti-radiation frequency discriminator and phase detector includes a total of 6 single-pole double-throw switches S1, 4 identical frequency discriminator and phase detector branches 105 - 108, and a logic gate circuit 109; the input signal REF is transmitted to the moving end of switch S1, and the fixed ends 1.1 and 1.2 of S1 are respectively connected to the frequency discriminator and phase detector branches 105 and 106; the outputs upb1 and up1 of the frequency discriminator and phase detector branch 105 are respectively connected to the fixed end 3.1 of switch S3 and the fixed end 4.1 of switch S4; the outputs upb2 and up2 of the frequency discriminator and phase detector branch 106 are respectively connected to the fixed end 3.2 of switch S3 and the fixed end 4.2 of switch S4; the input signal DIV is transmitted to the moving end of switch S2, and the fixed ends 2.1 and 2.2 of S2 are respectively connected to the frequency discriminator and phase detector branches 107 and 108; the outputs dn1 and dnb1 of the frequency discriminator and phase detector branch 107 are respectively connected to the fixed end 5.1 of switch S5 and the fixed end 6.1 of switch S6; the outputs dn2 and dnb2 of the frequency discriminator and phase detector branch 108 are respectively connected to the fixed end 5.2 of switch S5 and the fixed end 6.2 of switch S6; the moving end of switch S3 is the output upb of this circuit module; the moving end of switch S4 is the output up of this circuit module; the moving end of switch S5 is the output dn of this circuit module; the moving end of switch S6 is the output dnb of this circuit module; the feedback outputs of the frequency discriminator and phase detector branches 105 and 106 are connected to the input a port of the logic gate circuit 109, the feedback outputs of the frequency discriminator and phase detector branches 107 and 108 are connected to the input b port of the logic gate circuit 109, the output port of the logic gate circuit 109 is grounded through a capacitor and connected to the reset signal ports of the frequency discriminator and phase detector branches 105 - 108; the switching of switches S1 - 6 is controlled by the control signal output by the control module, so as to flexibly switch the actually working frequency discriminator and phase detector branches. For example, branch 105 can work simultaneously with branch 107 or 108, and branch 106 can also work simultaneously with branch 107 or 108, thereby improving the circuit reliability and enhancing the anti-radiation performance and stability of the system.

Claims

1. A frequency discriminator and phase discriminator applied to a spaceborne communication chip, characterized in that The circuit structure includes: an anti-radiation frequency discriminator and phase detector core circuit, a power detection circuit, an analog-to-digital converter, and a control module circuit; an input signal is input to the anti-radiation frequency discriminator and phase detector core circuit, and an output signal is generated and output to the power detection circuit; the power detection circuit processes the received signal, outputs the processing result to the analog-to-digital converter, and receives an instruction from the control module circuit to generate an output signal of the overall circuit; 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 makes a judgment based on the input digital signal, generates a control signal for controlling the working mode of the anti-radiation frequency discriminator and phase detector core circuit, and generates control signals for controlling the power detection circuit and the analog-to-digital converter.

2. The anti-radiation frequency discriminator and phase discriminator applied to the spaceborne communication chip according to claim 1, characterized in that, The anti-radiation frequency discriminator and phase detector core circuit is composed of four frequency discriminator and phase detector branches, a logic gate circuit, and six numerically controlled single-pole double-throw switches; the circuit structures of the four frequency discriminator and phase detector branches are exactly the same, and are composed of D flip-flops and digital logic circuits; the two frequency discriminator and phase detector branches connected to the same input signal are backup to each other and can be switched by changing the connection state of the single-pole double-throw switch under the control of the system, so as to effectively reduce the failure probability of the overall circuit and improve the anti-radiation performance and stability of the system.

3. The anti-radiation frequency discriminator and phase discriminator applied to the spaceborne communication chip according to claim 2, wherein The core circuit of the anti-radiation frequency discriminator and phase detector includes a total of 6 single-pole double-throw switches S1, 4 identical frequency discriminator and phase detector branches 105-108, and a logic gate circuit 109; the input signal REF is transmitted to the moving end of the switch S1, and the stationary ends 1.1 and 1.2 of S1 are respectively connected to the frequency discriminator and phase detector branches 105 and 106; the outputs upb1 and up1 of the frequency discriminator and phase detector branch 105 are respectively connected to the stationary end 3.1 of the switch S3 and the stationary end 4.1 of the switch S4; the outputs upb2 and up2 of the frequency discriminator and phase detector branch 106 are respectively connected to the stationary end 3.2 of the switch S3 and the stationary end 4.2 of the switch S4; the input signal DIV is transmitted to the moving end of the switch S2, and the stationary ends 2.1 and 2.2 of S2 are respectively connected to the frequency discriminator and phase detector branches 107 and 108; the outputs dn1 and dnb1 of the frequency discriminator and phase detector branch 107 are respectively connected to the stationary end 5.1 of the switch S5 and the stationary end 6.1 of the switch S6; the outputs dn2 and dnb2 of the frequency discriminator and phase detector branch 108 are respectively connected to the stationary end 5.2 of the switch S5 and the stationary end 6.2 of the switch S6; the moving end of the switch S3 is the output upb of this circuit module; the moving end of the switch S4 is the output up of this circuit module; the moving end of the switch S5 is the output dn of this circuit module; the moving end of the switch S6 is the output dnb of this circuit module; the feedback outputs of the frequency discriminator and phase detector branches 105 and 106 are connected to the input a port of the logic gate circuit 109, the feedback outputs of the frequency discriminator and phase detector branches 107 and 108 are connected to the input b port of the logic gate circuit 109, the output port of the logic gate circuit 109 is grounded through a capacitor and connected to the reset signal ports of the frequency discriminator and phase detector branches 105-108; the switching of the switches S1-6 is controlled by the control signal output by the control module, so as to flexibly switch the actually working frequency discriminator and phase detector branches. For example, branch 105 can work with branch 107 or 108 at the same time, and branch 106 can also work with branch 107 or 108 at the same time, thereby improving the circuit reliability and enhancing the anti-radiation performance and stability of the system.

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