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

A technology with sinusoidal carrier wave and frequency stability, applied in the field of communication, can solve the problems of complex control interface relationship and high implementation cost, and achieve the effects of simple circuit implementation, low cost, and stable and controllable frequency.

Active Publication Date: 2014-09-24
航天科工惯性技术有限公司
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  • Application Information

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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 wavef

Method used

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

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Embodiment Construction

[0021] The present invention will be further described below through specific embodiments and drawings.

[0022] This embodiment provides a near-sinusoidal generator circuit capable of wide temperature application and stable and controllable frequency. Its principle diagram is as follows: figure 1 Shown. The specific implementation is a combination of a PWM generating circuit and a first-stage band pass filter. The PWM generation circuit is realized by a wide-temperature single-chip microcomputer combined with internal structure and C language programming. The band-pass filter adopts a standard voltage-controlled voltage source second-order band-pass filter circuit.

[0023] Such as figure 1 As shown, the internal structure of a wide temperature microcontroller with PWM output function includes duty factor register 1, buffer 2, comparator 3, timer 4, comparator 5, period register 6, RS flip-flop 7, and output controller 8. Buffer 2 takes out the duty factor data from the duty fa...

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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...

Claims

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Application Information

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IPC IPC(8): H03K3/80H03B28/00
Inventor 余莉张秋月孔祥苓张鹏飞刘松张宏
Owner 航天科工惯性技术有限公司
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