Ring oscillator applied to satellite-borne communication chip

Abstract

The invention belongs to the technical field of integrated circuits, and particularly relates to an anti-radiation ring oscillator applied to a satellite-borne wireless communication system. The circuit structure of the ring oscillator comprises an anti-radiation ring oscillator core circuit, a signal detection circuit, an analog-to-digital converter and a control module circuit, the anti-radiation ring oscillator core circuit generates an output signal and outputs the output signal to the signal detection circuit; the signal 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 signal 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 ring oscillator core circuit, and generates a control signal for controlling the signal detection circuit and the analog-to-digital converter; the anti-radiation ring oscillator core is composed of two identical ring oscillators and a numerical control single-pole double-throw switch. Switching of the two paths of ring oscillators is controlled by a numerical control single-pole double-throw switch, and by means of the structure, the circuit failure probability caused by space irradiation can be remarkably reduced, and the anti-irradiation performance and 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 ring oscillator. Background Art

[0002] A ring oscillator is an important component in a phased array transceiver system, mainly used to implement frequency sources such as phase-locked loops. A ring oscillator is a component based on a positive feedback oscillation circuit, which can generate periodic oscillation signals and has the characteristics of stable frequency.

[0003] The ring oscillator has the characteristics of simplicity, compact structure, small occupied space, and high frequency stability. Compared with other oscillators, it has lower power consumption, less noise interference, and less temperature drift, and is suitable for application scenarios with high frequency, high speed, low power consumption, low noise, and dense wiring, such as radio, communication, radar and other fields, and is an ideal choice in the design of spaceborne communication chips.

[0004] Currently, the increasingly wide range of communication application fields have put forward more requirements for phased array transceiver systems and ring oscillator 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, with 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 the system stability and reliability. Summary of the Invention

[0005] The purpose of the present invention is to propose an anti-irradiation ring oscillator applied to spaceborne communication chips.

[0006] The ring oscillator proposed by the present invention has a circuit structure including: an anti-irradiation ring oscillator core circuit, a signal detection circuit, an analog-to-digital converter, and a control module circuit; the anti-irradiation ring oscillator core circuit generates an output signal and outputs it to the signal detection circuit; the signal detection circuit processes the signal it receives, 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 signal 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 ring oscillator core circuit, and generates control signals for controlling the signal detection circuit and the analog-to-digital converter.

[0007] In the present invention, the anti-irradiation ring oscillator core circuit is composed of two ring oscillators and a numerically controlled single-pole double-throw switch; the two ring oscillators have exactly the same structure and both adopt a basic ring oscillator architecture; each oscillator is composed of three ring-connected common-source amplifiers, and each stage of the common-source amplifier is powered by the power supply voltage through a drain resistor and has a load capacitor connected to the drain.

[0008] The ring oscillator designed in the present invention generally has two mutually backup ring oscillator channels, and can be switched by changing the connection state of the single-pole double-throw switch under the control of the system, thereby significantly reducing the probability of circuit failure caused by space radiation, and enhancing the radiation resistance performance and stability of the overall circuit and system. Brief Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the radiation-resistant ring oscillator of the present invention.

[0010] Figure 2 It is a schematic diagram of the core circuit of the radiation-resistant ring oscillator. Detailed Embodiments

[0011] The present invention will be described in more detail below with reference to the drawings. In each of the 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 can be implemented without these specific details.

[0013] Figure 1 It shows a schematic structural diagram of the spaceborne radiation-resistant ring oscillator of the present invention.

[0014] As Figure 1 shown, the spaceborne radiation-resistant ring oscillator 100 in the present invention includes a radiation-resistant phase-shifting core circuit 101, a signal detection circuit 102, a control module 103, and an analog-to-digital converter 104. The power supply voltage VDD is connected to the radiation-resistant ring oscillator core circuit 101. The output Vo' of the radiation-resistant ring oscillator core circuit 101 is transmitted to the signal detection circuit 102. The output Vo of the signal detection circuit 102 is used as the output signal of the entire ring oscillator circuit. The output pdout of the signal detection circuit 102 is transmitted to the analog-to-digital converter 104. The output adout of the analog-to-digital converter 104 is transmitted to the control module 103. The control module 103 outputs Ctrl1 to the radiation-resistant ring oscillator core circuit 101, outputs Ctrl2 to the signal detection circuit 102, and outputs Ctrl3 to the analog-to-digital converter 104.

[0015] Figure 2 It shows a schematic diagram of the core circuit of the radiation-resistant ring oscillator in the present invention.

[0016] As Figure 2As shown in the figure, the core circuit of the anti-radiation ring oscillator of the present invention includes: 1 single-pole double-throw switch S1, 6 transistors M1 - M6, 6 drain resistors R D1 -R D6 , 6 load impedances C L1 -C L6。 Among them, transistors M1 - M3, drain resistors R D1 -R D3 , load impedances C L1 -C L3 constitute the first channel of the ring oscillator; transistors M4 - M6, drain resistors R D4 -R D6 , load impedances C L4 -C L6 constitute the second channel of the ring oscillator; the power supply voltage V DD is respectively connected to the drains of transistors M1 - M6 through resistors R D1 -R D6 ; the sources of transistors M1 - M6 are grounded; the gate of transistor M1 is connected to the drain of transistor M3, and the drain is grounded through a capacitor C L1 and is connected to the gate of transistor M2; the drain of transistor M2 is grounded through a capacitor C L2 and is connected to the gate of transistor M3; the drain of transistor M3 is grounded through a capacitor C L3 and is connected to the fixed terminal 1.1 of switch S1; the gate of transistor M4 is connected to the drain of transistor M6, and the drain is grounded through a capacitor C L4 and is connected to the gate of transistor M5; the drain of transistor M5 is grounded through a capacitor C L5 and is connected to the gate of transistor M6; the drain of transistor M6 is grounded through a capacitor C L6 and is connected to the fixed terminal 1.2 of switch S1; the moving terminal of switch S1 outputs the signal Vo'; the switching of switch S1 is controlled by the control signal output by the control module, so as to flexibly switch the actually working ring oscillator channel, thereby improving the circuit reliability and enhancing the anti-radiation performance and stability of the system.

Claims

1. A ring oscillator applied to a spaceborne communication chip, characterized in that The circuit structure includes: an anti-radiation ring oscillator core circuit, a signal detection circuit, an analog-to-digital converter, and a control module circuit; the anti-radiation ring oscillator core circuit generates an output signal and outputs it to the signal detection circuit; the signal detection circuit processes the received signal, outputs the processing result to the analog-to-digital converter, and receives the instruction of the control module circuit to generate the output signal of the overall circuit; the analog-to-digital converter converts the processing result output by the signal 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 ring oscillator core circuit, and generates control signals for controlling the signal detection circuit and the analog-to-digital converter.

2. The ring oscillator applied to the spaceborne communication chip according to claim 1, wherein The anti-radiation ring oscillator core circuit is composed of two ring oscillators and a numerically controlled single-pole double-throw switch; the two ring oscillators have exactly the same structure and both adopt the basic ring oscillator architecture; each oscillator is composed of three ring-connected common-source amplifiers, and each stage of the common-source amplifier is powered by the power supply voltage through the drain resistance and has a load capacitor connected to the drain. The two ring oscillators 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 ring oscillator applied to the spaceborne communication chip according to claim 2, characterized in that, The core circuit of the radiation-resistant ring oscillator includes a single-pole double-throw switch S1, six transistors M1 - M6, six drain resistors R D1 -R D6 , six load impedances C L1 -C L6 ; among them, transistors M1 - M3, drain resistors R D1 -R D3 , load impedances C L1 -C L3 form the first ring oscillator channel; transistors M4 - M6, drain resistors R D4 -R D6 , load impedances C L4 -C L6 form the second ring oscillator channel; the power supply voltage V DD is respectively connected to the drains of transistors M1 - M6 through resistors R D1 -R D6 ; the sources of transistors M1 - M6 are grounded; the gate of transistor M1 is connected to the drain of transistor M3, and the drain is grounded through a capacitor C L1 and is connected to the gate of transistor M2; the drain of transistor M2 is grounded through a capacitor C L2 and is connected to the gate of transistor M3; the drain of transistor M3 is grounded through a capacitor C L3 and is connected to the fixed terminal 1.1 of switch S1; the gate of transistor M4 is connected to the drain of transistor M6, and the drain is grounded through a capacitor C L4 and is connected to the gate of transistor M5; the drain of transistor M5 is grounded through a capacitor C L5 and is connected to the gate of transistor M6; the drain of transistor M6 is grounded through a capacitor C L6 and is connected to the fixed terminal 1.2 of switch S1; the movable terminal of switch S1 serves as the output of this circuit module; the switching of switch S1 is controlled by the control signal output by the control module, so as to flexibly switch the actually working ring oscillator channel, thereby improving the circuit reliability and enhancing the radiation resistance performance and stability of the system.

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