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High precision numerical control annular oscillator adopting laminated current tubes

A ring oscillator and high-precision technology, applied in the field of numerically controlled oscillators and high-precision numerically controlled ring oscillators, can solve problems such as the decrease in the accuracy of current mirroring, and achieve the effect of improving accuracy and high frequency accuracy

Active Publication Date: 2016-07-27
PEKING UNIV
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Problems solved by technology

As far as the actual situation is concerned, the highest current accuracy can reach the level of hundreds of nanoamperes. If it continues to increase, on the one hand, the working area of ​​the current tube will gradually work in the sub-threshold area, resulting in a decrease in the accuracy of the current mirror, and on the other hand, the magnitude of the leakage current will gradually increase. compared to the mirror current

Method used

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  • High precision numerical control annular oscillator adopting laminated current tubes
  • High precision numerical control annular oscillator adopting laminated current tubes
  • High precision numerical control annular oscillator adopting laminated current tubes

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Embodiment Construction

[0032] The specific implementation scheme of the numerically controlled oscillator with low power consumption and high precision described in the present invention is as follows:

[0033] Such as figure 2 As shown, in one embodiment, the high-precision numerically controlled ring oscillator using a laminated current tube is provided, including:

[0034] Located on the right side of the figure is a fine-tuning array composed of a plurality of array units unit1 to unit16, each array unit includes a plurality of array MOS transistors in the same direction, and the array units are connected in series according to the width W direction of the array MOS transistors, according to The length L direction of the array MOS transistors is connected in parallel;

[0035] The greater the number of stacked layers of the array unit in the direction of the length L, the higher the frequency accuracy. For example, if the number of layers is 8, the frequency accuracy can be increased by 8 tim...

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Abstract

The invention discloses a high precision numerical control annular oscillator adopting laminated current tubes. The high precision numerical control annular oscillator includes a fine modulation array including a plurality of array units. Each array unit includes a plurality of array MOS tubes in a consistent direction. The array units are connected in series according to the width W direction of the array MOS tubes and are connected in parallel in the length L direction of the array MOS tubes. The high precision numerical control annular oscillator also includes a fixed current circuit connected in parallel with the fine modulation array. According to the invention, higher frequency precision can be achieved under the limited minimum current. Through the optimization of the array units of the fine modulation array, the current change rate is increased, namely, the time period starting from current control code input to output current change implementation is short, so that the high precision numerical control annular oscillator can meet requirements for working at high rates.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a numerically controlled oscillator, in particular to a high-precision numerically controlled ring oscillator using a laminated current tube. Background technique [0002] Phase-locked loop is one of the core circuits of modern electronic systems and is the most common frequency source. The development of integrated circuits (Integrated Circuits, IC) process technology makes digital phase-locked loop technology possible. Compared with the analog phase-locked loop, the characteristics of the digital phase-locked loop are less affected by process, voltage and temperature fluctuations, and have better stability. [0003] The digital phase-locked loop uses digital codes to control the oscillator, and its output frequency is not a continuous value like a voltage-controlled oscillator, but can only be a series of discrete frequency values ​​corresponding to different contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099
CPCH03L7/0995H03L2207/50
Inventor 廖怀林王润华杨帆刘军华
Owner PEKING UNIV
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