Self-biased high-adaptability crystal oscillation integrated circuit

Abstract

The invention discloses a self-biased high-adaptability crystal oscillation integrated circuit in the technical field of integrated circuit design, which comprises a crystal oscillation circuit and a self-biased current source circuit, the crystal oscillation circuit is used for generating a source signal of crystal oscillation, the self-biased current source circuit is connected with the output end of the crystal oscillation circuit, and the self-biased current source circuit is connected with the output end of the crystal oscillation circuit. The self-bias current source circuit is used for carrying out nonlinear amplification on a source signal of crystal oscillation and comprises a first resistor, and the first resistor is used for generating bias current and controlling overall power consumption. The large-range distribution of the equivalent series resistors of the crystal oscillator is controlled, so that the phase margin of the system circuit is within an acceptable range, and meanwhile, through the application of the self-bias current source circuit, an external bias circuit and bias voltage can be prevented from being not needed, so that the current consumption of another bias circuit module is avoided, and the service life of the system circuit is prolonged. The ultra-low power consumption working state of the system can be realized.

Description

technical field [0001] The present invention relates to the technical field of integrated circuit design, in particular to a self-biased crystal oscillator integrated circuit with high adaptability. Background technique [0002] In modern electronic systems, crystal oscillator circuits are used more and more widely in integrated circuit design as clock generators. Among them, the traditional Pierce oscillator is widely used in integrated circuits including SOC. For example, the Chinese invention patent with the application number 201210559927.X and the Chinese invention patent with the application number 200910152407.5 all use the Pierce oscillator as the clock Signal generator. [0003] like figure 1 As shown, in a traditional Pierce oscillator, the oscillator loop consists of an inverting amplifier, a feedback resistor (usually inside the chip), and a crystal oscillator XTAL (X) and an external load capacitor (C 1 and C 2 ) composed of an accurate phase-shift circuit. ...

AI Technical Summary

Problems solved by technology

[0004] However, in traditional Pierce oscillators, according to different crystal oscillator manufacturers, the equivalent series resistance ESR at room temperature and pressure can range from 20Kohm to 100Kohm, and even some vacuum-packaged crystal oscillators can range from 20Kohm to 100Kohm. 1Mohm, the ESR with a huge variation range leads to a reduction in the phase margin of the oscillator, which is very unfavorable for the design of the oscillator's peripheral circuit

In addition, for the Internet of Things (IOT) system-on-chip (SOC), which is more and more widely used, in the crystal oscillator as the basic unit of timing, if the timing deviates because the power supply (battery) is exhausted, it is Extremely need to be avoided, and the traditional Pierce oscillator does not have a controllable current power consumption control system, it can only be carried out according to simulation, and due to the deviation of the integrated circuit chip process, the power consumption consistency between chips is also very poor

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