High linearity sine wave generator followed by clock multiplier dividing

Abstract

The invention relates to a high linearity sine wave generator followed by clock multiplier dividing. The high linearity sine wave generator includes a reference voltage input end, a grounding end, a fully differential amplifier and a plurality of serially connected voltage divider resistors, further includes a non-gate and a counter connected to an external clock signal, a seed logic generator connected with a counter, and a shift register connected with the seed logic generator, the clock signal input end of the shift register is connected with the output end of the non-gate, the shift register successively controls a first 1+H positive switch and an N+1-H negative switch to be turned on through a logic switch, H is in an integer being less than and equal to N and is greater than and equal to 0, so that the fully differential amplifier outputs sine waves. According to the invention, the problems of low frequency stability and bad 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 following 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 ser...

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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