Relaxation oscillator and chip on chip
A relaxation oscillator and switch technology, which is applied in the field of semiconductor integrated circuits, can solve problems such as the influence of relaxation oscillator output frequency fluctuations, and achieve the effect of facilitating layout design and simple circuit structure
Active Publication Date: 2020-09-18
灵矽微电子(深圳)有限责任公司
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Problems solved by technology
[0004] The main purpose of the present invention is to provide a relaxation oscillator and a chip on chip, aiming to solve the problem that the output frequency of the existing relaxation oscillator is too much affected by the fluctuation of the power supply voltage
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[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0037] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the figure). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.
[0038] In the present invention, unless...
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The invention discloses a relaxation oscillator and a chip on chip. The relaxation oscillator comprises a power supply input end, a zero crossing point stabilizing circuit, a comparator and a non-overlapping clock generating circuit, wherein the zero-crossing point stabilizing circuit comprises a first zero-crossing point stabilizing circuit and a second zero-crossing point stabilizing circuit; the first zero crossing point stabilizing circuit and the second zero crossing point stabilizing circuit are used for controlling the first charging and discharging circuit and the second charging and discharging circuit to alternately perform a charging / discharging process according to the received two groups of control signals generated by the non-overlapping clock generation circuit, and switching the two groups of control signals at the zero crossing point moment of an input power supply signal; therefore, the comparator can convert charging and discharging signals of the first charging anddischarging circuit and the second charging and discharging circuit into square-wave clock driving signals and then output the square-wave clock driving signals so as to drive the non-overlapping clock generating circuit to generate corresponding clock oscillation signals. According to the invention, a clock oscillation signal whose output frequency is not sensitive along with the power supply change can be obtained.
Description
technical field [0001] The invention relates to the technical field of semiconductor integrated circuits, in particular to a relaxation oscillator and an on-chip chip. Background technique [0002] Currently, relaxation oscillators are widely used as reference clock oscillators in various microchips, such as implantable biomedical devices and smart sensors. [0003] However, with the improvement of the integration level of analog and digital circuits, the noise generated by other modules in the chip (especially digital modules) will be coupled through the power line and ground line, causing the oscillator power supply voltage to fluctuate, thus making the voltage frequency received by the subsequent circuit Fluctuations will seriously affect the stability of its output frequency. The prior art uses a mirror circuit to generate mirror currents Iin and Iip that do not change with the power supply to eliminate the influence of power supply voltage fluctuations. However, when t...
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IPC IPC(8): H03K17/13
CPCH03K17/133
Inventor 黄海周金玲张礼军张专
Owner 灵矽微电子(深圳)有限责任公司