简单的脉冲发生器具有低组件数-Simple Pulse Ge
abstract: with a few op amps and some external components, you can build a pulse generator with variable frequency and duty cycle.
the natural choice for generating a pulse of variable frequency and duty cycle is a good bench-top pulse generator. if you don't have a generator or must build one into your system, however, you can do it with a few op amps and some external components (figure 1).
figure 1. this simple and versatile pulse generator includes only 15 components.
u1 and q1 form a voltage-controlled oscillator (vco) with a square-wave output and a triangle-wave output. the square wave feeds back to control the charge and discharge of integrating capacitor c1, and is also useful as a sync-signal output. the triangle wave drives the non-inverting input of duty-cycle controller u2-2. r2 fully adjusts the output duty cycle (from 0% to 100%) by controlling u2-2's inverting input. u2-2 generates the output signal directly.
u2-1 buffers r1's wiper voltage, which controls the vco frequency. a change in supply voltage (v+) varies the output swing without effecting the output frequency or duty cycle, and the circuit operates equally well with a single supply or with dual supplies. the frequency range shown is 20hz to 13khz, but you can modify that range by changing the value of c1. the dual op amps (designed for controlling power amplifiers) are chosen for their high output drive, rail-to-rail input and output capabilities, single-supply operation, and exceptional open-loop behavior.
a similar version of this article appeared in the january 20, 2003 issue of eet magazine.
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the natural choice for generating a pulse of variable frequency and duty cycle is a good bench-top pulse generator. if you don't have a generator or must build one into your system, however, you can do it with a few op amps and some external components (figure 1).
figure 1. this simple and versatile pulse generator includes only 15 components.
u1 and q1 form a voltage-controlled oscillator (vco) with a square-wave output and a triangle-wave output. the square wave feeds back to control the charge and discharge of integrating capacitor c1, and is also useful as a sync-signal output. the triangle wave drives the non-inverting input of duty-cycle controller u2-2. r2 fully adjusts the output duty cycle (from 0% to 100%) by controlling u2-2's inverting input. u2-2 generates the output signal directly.
u2-1 buffers r1's wiper voltage, which controls the vco frequency. a change in supply voltage (v+) varies the output swing without effecting the output frequency or duty cycle, and the circuit operates equally well with a single supply or with dual supplies. the frequency range shown is 20hz to 13khz, but you can modify that range by changing the value of c1. the dual op amps (designed for controlling power amplifiers) are chosen for their high output drive, rail-to-rail input and output capabilities, single-supply operation, and exceptional open-loop behavior.
a similar version of this article appeared in the january 20, 2003 issue of eet magazine.
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vivox9s手机怎么样 超出价位表现
Thermaltake BT 600W电源怎么样
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简单的脉冲发生器具有低组件数-Simple Pulse Ge
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华为5G基站设计流程
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上半年全球电信设备市场增长了4%，华为继续保持全球第一
国产手机自主芯片阵队浮现 海思、米果、展讯走在前列
从开源角度看待云计算和大数据目前现状
双向晶闸管调压的工作原理是什么？
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如何查看自己手机授权过的应用
北鲲云超算平台能为 IC 设计做什么
晶闸管的开关功能及电路图
河北将在可穿戴设备、VR等四方面加强研发应用
华为荣耀8：华为价格最稳定的一部手机，大半年从未降价