摘要
文章介绍了基于MC1496平衡调幅实验电路的工作原理和实验方法,推导了调制度理论值的计算公式,对实验结果调制度m a实验值与理论值的误差进行了分析,指出了造成误差的原因,提出了减小误差的方法,将基于MC1496平衡调幅实验电路的耦合电容C3的电容值从原来的10uF改变成33uF。本文给出了C3=10uF和C3=33uF时的实验结果。实验结果表明,调制度ma实测值与理论值的误差大为减小,调制度ma的实验精度大为提高。
This paper introduces principles and usages of a MC1496-based test circuit for balanced amplitude modulation, and deduces the formula for modulation coefficient ma. The paper analyzes the error between the test and the calculation of ma, as well as the reason that leads to the error. Improvement is proposed, i.e., the capacitance of capacitor C3 in the circuit is changed from lOuF to 33uF. The paper gives test results for C3=10uF and C3=33uF respectively, which demonstrates the error is significantly decreased.
出处
《中国现代教育装备》
2010年第9期42-44,共3页
China Modern Educational Equipment
关键词
电子技术
调幅
调制度
电容
electronics
amplitude modulation
modulation coefficient
capacitance
