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一 引言 在数字通讯、计算机网、信息控制和遥测工程中,广泛使用数字解调器。例如,欲测或控制远地某一物理量,可先通过传感器将它变成电信息,然后用A/D、D/f变换器变成适合远距离传输的调频信号。在接收端用数字解调器复现数字信号,再送入D/A转换器就还原成模拟信息了。目前国内多数厂家生产的低速数传机的解调器采用L、C调谐回路来鉴频。因而体积较大,电感制作工艺复杂,易受外界电磁场干扰。本文介绍一种应用集成运算放大器构成的数字解调器。经实验表明,性能稳定可靠,体积小,成本较低。
I. INTRODUCTION Digital demodulators are widely used in digital communications, computer networks, information control and telemetry projects. For example, to measure or control a physical quantity in a remote place, it can be turned into electrical information by a sensor and then converted into a frequency modulated signal suitable for long-distance transmission by A / D and D / f converters. Reproduce the digital signal with digital demodulator at the receiving end, and then send into D / A converter and revert to analog information. At present, the majority of domestic manufacturers of low-speed digital transmission machine demodulator L, C tuning circuit to Kam. Therefore, larger, complex inductor manufacturing process, susceptible to external electromagnetic interference. This article describes a digital demodulator application of integrated operational amplifier. The experiment shows that the performance is stable and reliable, small size and low cost.