High precision on-chip clock oscillator based on cmos technology

Abstract

The invention discloses a complementary metal oxide semiconductor (CMOS)-process-based high-accuracy on-chip clock oscillator, which comprises a frequency voltage conversion circuit, an integral circuit, a voltage-controlled oscillator, an automatic current trimming circuit, an adjustable temperature coefficient current source and a band gap reference circuit, wherein the frequency voltage conversion circuit, the integral circuit and the voltage-controlled oscillator are sequentially connected into a closed loop structure. The frequency voltage conversion circuit, the integral circuit and the voltage-controlled oscillator form a closed loop control oscillator circuit, so that the output frequency of the oscillator circuit is controlled by the whole closed loop without the influence of process variations of MOS transistors. Due to the adoption of the closed loop, the oscillator circuit has high noise performance. In addition, a temperature compensation current source and the automatic current trimming circuit are adopted for the whole loop, so that the oscillator circuit is ensured to have high temperature and process stability. Moreover, the oscillator circuit is simple and high in clock accuracy, and an external quartz crystal oscillator of an electronic system can be replaced.

Description

technical field

[0001] The invention relates to the field of electricity, in particular to a clock oscillation circuit, in particular to a high-precision on-chip clock oscillator based on CMOS technology. Background technique

[0002] In various electronic systems, a crystal oscillator (XTAL) is an essential clock reference signal. Widely used in computers, remote controls and automatic control circuits. It is mainly used in frequency generators in communication systems to generate clock signals for data processing equipment to maintain the synchronization of signal transmission. Although crystal oscillators can generate accurate clock signals, the clock signals generated by crystal oscillators have the disadvantages of high cost, high power consumption of the system, and the shortcomings of not being able to be integrated into the chip. There is no way to achieve low-cost, Requirements for low power consumption and miniaturization, especially in biomedical chips and IoT c...

Examples

Embodiment Construction

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0021] refer to figure 1 As shown, a high-precision on-chip clock oscillator based on CMOS technology includes a frequency-voltage conversion circuit 1, an integrating circuit 2, a voltage-controlled oscillator 3, an automatic current trimming circuit 4, a current source with adjustable temperature coefficient 5 and a Gap reference circuit 6, the frequency voltage conversion circuit 1, the integration circuit 2 and the voltage controlled oscillator 3 are sequentially connected to form a closed-loop structure; the frequency voltage conversion circuit 1 is connected to the temperature coefficient adjustable current source 5 , the current automatic trimming circuit 4 and the bandgap reference circuit 6 are connected to the temperature coefficient adjustable current source 5 respectively, and the bandgap reference circuit 6 is also conne...

technical field

[0001] The invention relates to the field of electricity, in particular to a clock oscillation circuit, in particular to a high-precision on-chip clock oscillator based on CMOS technology. Background technique

[0002] In various electronic systems, a crystal oscillator (XTAL) is an essential clock reference signal. Widely used in computers, remote controls and automatic control circuits. It is mainly used in frequency generators in communication systems to generate clock signals for data processing equipment to maintain the synchronization of signal transmission. Although crystal oscillators can generate accurate clock signals, the clock signals generated by crystal oscillators have the disadvantages of high cost, high power consumption of the system, and the shortcomings of not being able to be integrated into the chip. There is no way to achieve low-cost, Requirements for low power consumption and miniaturization, especially in biomedical chips and IoT c...

Examples

Embodiment Construction

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0021] refer to figure 1 As shown, a high-precision on-chip clock oscillator based on CMOS technology includes a frequency-voltage conversion circuit 1, an integrating circuit 2, a voltage-controlled oscillator 3, an automatic current trimming circuit 4, a current source with adjustable temperature coefficient 5 and a Gap reference circuit 6, the frequency voltage conversion circuit 1, the integration circuit 2 and the voltage controlled oscillator 3 are sequentially connected to form a closed-loop structure; the frequency voltage conversion circuit 1 is connected to the temperature coefficient adjustable current source 5 , the current automatic trimming circuit 4 and the bandgap reference circuit 6 are connected to the temperature coefficient adjustable current source 5 respectively, and the bandgap reference circuit 6 is also conne...

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