an oscillating circuit

A technology of oscillating circuit and oscillating module, applied in the direction of heating element shape, etc., can solve the problems of difficulty in meeting the requirements of small circuit size, large capacitance occupying wafer area, high circuit cost, etc., to achieve good performance and ensure oscillation amplitude , The effect of reducing the wafer area
CN111629463BActive Publication Date: 2022-06-17深圳昂瑞微电子技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
深圳昂瑞微电子技术有限公司
Publication Date
2022-06-17

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Abstract

The present application discloses an oscillating circuit. The amplifying module and the clamping module of the oscillating circuit constitute a low-dropout linear voltage regulator, which limits the potential of the second terminal of the clamping module to a preset voltage. Since the second terminal of the clamping module The output impedance of the terminal is very small within the bandwidth of the amplifying module, which can provide this point with the effect similar to the AC virtual ground. The virtual ground effect of this point makes the oscillation module realize the improvement at low frequencies without a large capacitor occupying a large wafer area. The purpose of the negative resistance of the circuit is beneficial to reduce the wafer area required by the oscillator circuit. In addition, due to the existence of the low-dropout linear voltage regulator, even if the capacitance in the oscillation module is adjusted to meet the consistency of the wafer, it will not cause the potential change of the second terminal of the clamp module, and the final output oscillation signal The upper limit will not change, which is beneficial to ensure the oscillation amplitude of the oscillation signal output by the oscillation circuit and ensure that the oscillation circuit has good performance.
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Description

technical field

[0001] The present application relates to the technical field of integrated circuits, and more particularly, to an oscillator circuit. Background technique

[0002] Crystal oscillators have found numerous applications in various electronic systems. With the continuous development of wireless communication technology and the popularization of portable mobile devices, the clock signal has become a necessary signal for the cooperative work of various internal devices.

[0003] Real Time Clock (RTC) signals are used in many digital integrated circuits. The key part of generating real time clock signals is the 32.768kHz crystal oscillator circuit. The circuit has put forward newer and higher requirements, which are concentrated in the aspects of high stability, wide power supply voltage range, small area, low power consumption and low cost.

[0004] In order to improve the negative resistance of the circuit under the condition of limited current in the crystal o...

Claims

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