High-precision active RC oscillator and high-precision calibration method thereof

A calibration method and oscillator technology, applied to power oscillators, electrical components, etc., can solve the problems of limited calibration accuracy of active RC oscillators

Active Publication Date: 2020-11-13
NANJING QINHENG MICROELECTRONICS CO LTD
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  • Abstract
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Problems solved by technology

[0012] Purpose of the invention: In order to solve the problem of limited calibration accuracy of active RC oscillators in the prior art, the present invention provides a high-precision calibration method for active RC oscillators

Method used

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  • High-precision active RC oscillator and high-precision calibration method thereof
  • High-precision active RC oscillator and high-precision calibration method thereof
  • High-precision active RC oscillator and high-precision calibration method thereof

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Embodiment Construction

[0071] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0072] Such as figure 1 As shown, a high-precision active RC oscillator includes a fixed current source, a variable current source, a variable resistor, a variable capacitor, a comparator, a discharge transistor, a reference frequency source, and a frequency calibration circuit. The fixed current source, which can The drain terminals of the variable current source are respectively connected to the two input terminals of the comparator; the variable resistor and the variable capacitor are respectively connected to the two input terminals of the comparator; the variable current source can be connected to the variable resistor, and the fixed current source To connect with a variable capacitor, you can also choose to connect a variable current source to a variable capacitor, or a fixed current source to connect to a variable resistor, as long as t...

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Abstract

The invention discloses a high-precision active RC oscillator and a high-precision calibration method thereof. The adjustable ranges of a variable current source, a variable capacitor and a variable resistor are respectively determined according to the target frequency and the required output frequency adjustable range, and the output frequency tends to the target frequency by continuously adjusting the variable current source, the variable capacitor and the variable resistor through three step-by-step calibration steps of coarse calibration, fine calibration and fine calibration. According tothe invention, the calibration stepping of the active RC oscillator in the frequency calibration process is more uniform, the linearization is higher, the calibration precision is higher, and the calibration speed is higher.

Description

technical field [0001] The invention relates to the field of analog integrated circuit design, in particular to a calibration method aimed at improving the precision of an active RC oscillator, which can be widely used in timing chips, wireless or wired communication chips. Background technique [0002] The principle of the active RC oscillator is mainly a frequency selection network composed of a frequency calibration circuit, a resistor R, a capacitor C, a reference current source, a discharge transistor and a comparator. [0003] The frequency output expression of an active RC oscillator is: [0004] (1) [0005] Traditional active RC oscillator calibration methods usually only calibrate resistors or capacitors, such as figure 2 As shown, the figure represents the relationship between the calibration control word and the output frequency when only the resistor R or capacitor C is calibrated. Assuming that the unit resistance is r, and the variable range of resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/20H03B5/06
CPCH03B5/06H03B5/20
Inventor 黄鹤
Owner NANJING QINHENG MICROELECTRONICS CO LTD
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