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

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...

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

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