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An accelerated start-up lc oscillator

An oscillator and oscillator circuit technology, applied in power oscillators, electrical components, etc., can solve the problem of slow start-up speed of oscillators, and achieve the effects of increasing power-on speed, speeding up start-up speed, and improving time delay characteristics.

Active Publication Date: 2022-07-19
江苏稻源科技集团有限公司
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Problems solved by technology

[0005] Purpose of the invention: In view of the above-mentioned prior art, an accelerated start-up LC oscillator is proposed to solve the problem of slow start-up speed of traditional oscillators without additional signal excitation

Method used

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Embodiment Construction

[0014] The present invention will be further explained below in conjunction with the accompanying drawings.

[0015] An accelerated start-up LC oscillator includes a traditional LC oscillator circuit and an auxiliary fast-start-up circuit. The conventional LC oscillator circuit includes a cross-coupling circuit, a resonant tank, and a differential amplifier circuit. The auxiliary fast start-up circuit includes a peak detection circuit, a quality factor control circuit and an energy injection circuit. The peak detection circuit is used to detect the real-time maximum amplitude when the traditional LC oscillation circuit starts to vibrate, and prepares for the subsequent judgment of whether the energy injection circuit and the quality factor control circuit start to work; the quality factor control circuit is used to start the traditional LC oscillation circuit. A resistor is connected in series during vibration to reduce the quality factor of the resonant circuit, thereby acce...

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Abstract

The invention discloses an accelerated start-up LC oscillator, which is composed of two parts, a traditional LC oscillation circuit and an auxiliary rapid start-up circuit. The traditional LC oscillation circuit includes a cross-coupling circuit, a resonant tank and a differential amplifier circuit, and the auxiliary fast start-up circuit includes a peak detection circuit, a quality factor control circuit and an energy injection circuit. When the circuit starts to vibrate, the quality factor of the resonant circuit is reduced by series-inserting a resistor to increase the noise passing rate, thereby accelerating the start-up, and at the same time, the influence of reducing the negative resistance caused by adding a resistor is compensated by injecting energy, so as to effectively speed up the vibration. Vibration speed.

Description

technical field [0001] The present invention relates to an LC oscillator. Background technique [0002] For analog circuits, the LC oscillator is an important module that generates stable clock signals, which are an integral part of sequential circuits. For a certain chip, the power-on time is a very important indicator, and it is often necessary to shorten the power-on time as much as possible to make the chip respond more quickly. In many applications, the power-up time depends on the start-up time of the LC oscillator, so shortening the start-up time of the LC oscillator is critical for improving electronic system applications. [0003] like figure 1 As shown, when the traditional LC oscillator starts to vibrate, its initial energy comes from the disturbance generated instantaneously when the circuit is connected to the power supply and the noise of the device itself. However, due to the high quality factor of the inductance in the LC network, it is equivalent to a band...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/04H03B5/12
CPCH03B5/04H03B5/1206
Inventor 徐凯王彬赵佳佳王中杰程晨唐晴桃
Owner 江苏稻源科技集团有限公司
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