Approximate sine carrier generator with wide-temperature application function and stable and controllable frequency

Abstract

The invention relates to an approximate sine carrier generator with the wide-temperature application function and stable and controllable frequency. The approximate sine carrier generator comprises a PWM generation circuit and a band-pass filter connected with the PWM generation circuit. The PWM generation circuit is composed of a wide-temperature single-chip microcomputer combination internal structure in a C language programming or assembly language programming mode. The band-pass filter is a standard voltage controlled voltage source two-stage band-pass filter. The wide-temperature single-chip microcomputer internal structure with the PWM output function comprises a duty factor register 1, a buffer 2, a comparator 3, a timer 4, a comparator 5, a period register 6, an RS trigger 7 and an output controller 8. The band-pass filter comprises a low-pass filter resistor R1, a capacitor C1, a high-pass filter capacitor C2, a resistor R2, a feedback resistor R3, an in-phase proportion operational circuit resistor Rx, a resistor Rf and an operational amplifier N1. The approximate sine carrier generator can achieve the wide-temperature application function, the frequency is stable and controllable, and generated approximate sine waves can be used as adjusted carrier waves in a digital modulation system.

Description

Technical field [0001] The invention belongs to the technical field of communication, and relates to a carrier generator, in particular to a near-sinusoidal carrier generator with wide temperature application and stable and controllable frequency. Background technique [0002] In most digital communication systems, sinusoidal signals are selected as the carrier. This is because the sine signal has a simple form and is easy to generate and receive. Generally, the sine signal as the carrier wave is generated by a waveform generator. However, for high-temperature application environments (such as 125°C), there is currently no pure hardware sine generator that can meet the requirements, but only programmable waveform generators. Although these devices are powerful, they all need to cooperate with a microprocessor. In addition, the control interface relationship is complicated and the implementation cost is relatively high. Summary of the invention [0003] In view of the above-ment...

AI Technical Summary

Problems solved by technology

However, for high-temperature application environments (such as 125°C), there is currently no pure hardware sine generator that can meet the requirements, but only a programmable waveform generator. Although this device is powerful, it needs to cooperate with a microprocessor. And the control interface relationship is complicated, and the implementation cost is high

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