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High-linearity sine-wave generator with multiplying clock multiple following

A sine wave generator, high linearity technology, applied in electrical components and other directions, can solve problems such as large capacitance value, large area, and inability to achieve frequency stability, and achieve the effect of improving linearity, design and implementation.

Active Publication Date: 2017-05-10
JIAXING NAJIE MICROELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current general sine wave generator ( figure 1 As shown), the output frequency has a great influence on the inconsistency of the resistance and capacitance and the temperature change, so the frequency stability cannot be achieved
The linearity is also affected by the operational amplifier and cannot be improved
If low-frequency frequency output is required, the capacitor value needs to be large, resulting in a large area, and the most serious ones cannot be based on the chip but must be connected externally

Method used

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  • High-linearity sine-wave generator with multiplying clock multiple following
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  • High-linearity sine-wave generator with multiplying clock multiple following

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] see figure 1 , figure 2 and image 3 , a high-linearity sine wave generator followed by clock multiples, including a reference voltage input terminal Vref, a ground terminal, a fully differential amplifier, and a plurality of series-connected voltage-dividing resistors. The voltage-dividing resistors include the zeroth resistor R 0 , the first resistor R 1 , the second resistance R 2 ...the N+2th resistor Rn+2, the zeroth resistor R 0 One end of Rn is connected to the reference voltage input end, the N+2th resistor Rn+2 is connected to the ground end, and a first voltage output point V is respectively set between multiple voltage dividing resistors 1 , the second voltage output point V2...the N+1th voltage output point V N+1 . Among them, the first voltage output point is set at the zero resistance R 0 with the first resistor R 1 Between, and so on, the setting position of N+1 voltage output points is between two voltage divider resistors.

[0025] Such as f...

Embodiment 2

[0044] see Figure 4 , a clock signal with a stable frequency is input from the crystal oscillator to a high-linearity sine wave generator followed by a multiplier of the clock. The high-linearity sine wave generator followed by the clock multiple produces a differential output clock to follow the stable frequency sine wave signal to the substrate of the sensor, and the positive terminal outputs V outp Connect the upper substrate V of the sensor st , the negative terminal outputs V outn Connect the lower substrate V of the sensor sb [The connection can also be reversed to output V for the positive terminal. outp Connect the lower substrate V of the sensor sb , the negative terminal outputs V outn Connect the upper substrate V of the sensor st 】. The substrate of the sensor V ctr Connect the negative terminal input of the front-end amplifier, connect the feedback capacitor C f One end, connected to the feedback resistor R f one end. The positive terminal input of the...

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Abstract

The invention relates to a high-linearity sine-wave generator with multiplying clock multiple following. The high-linearity sine-wave generator comprises a reference voltage input terminal, a ground terminal, a fully differential amplifier, a plurality of divider resistors connected in series, an dividing-M phase-locked loop connected to an external clock signal, a Not gate and a counter connected to the dividing-M phase-locked loop, a seed logic generator connected to the counter, and a shift register connected to the seed logic generator. A clock signal input terminal of the shift register is connected with the output terminal of the Not gate. The shift register controls a (1+H)th positive switch and a (N+1-H)th negative switch to turn on successively by a logic switch, wherein the H is an integer that is smaller than or equal to N and is larger than or equal to 0; and thus the fully differential amplifier can output a sine wave. Therefore, problems of low frequency stability and poor linearity can be solved.

Description

[0001] 【Technical field】 [0002] The present invention relates to electronic circuits, in particular to a high-linearity sine wave generator followed by clock multiples. [0003] 【Background technique】 [0004] Sine wave generators can be used in many fields, such as sensor carrier demodulation, communication reference oscillators, etc. In these application fields, frequency stability and linearity are the most important parameters of the sine wave generator, which directly determine the performance of the application system. The current general sine wave generator ( figure 1 As shown), the output frequency has a great influence on the inconsistency of the resistance and capacitance and the temperature change, so the state of frequency stability cannot be achieved. This linearity is also affected by the operational amplifier and cannot be improved. If low-frequency frequency output is required, the capacitor value needs to be large, resulting in a large area, and the most s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B28/00
CPCH03B28/00Y02D30/70
Inventor 李荣宽
Owner JIAXING NAJIE MICROELECTRONICS TECH
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