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这样的精度大家看看 |
| 作者：xiaopig769 栏目：模拟技术 |
我现在想做一个幅度在500MV--3V可调，频率为1KHZ，正负偏差不超过10HZ的正弦震荡电路，有什么办法可以达到这个精度呢，如果是普通的RC串并联加上正反馈产生的，达不到这样哦，好郁闷，大家帮忙看看 |
| 2楼： | >>参与讨论 |
| 作者： t-z-sh 于 2006/3/16 16:51:00 发布：
能买到1k的晶体不？ |
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| 3楼： | >>参与讨论 |
| 作者： qczq 于 2006/3/16 20:09:00 发布：
ML2037 ML2037: 500kHz, Serial Input, Programmable, Sine Wave Generator with DIGITAL Gain CONTROL |
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| 4楼： | >>参与讨论 |
| 作者： sharks 于 2006/3/17 11:36:00 发布：
给你一个10元以下的方案 用晶体产生一个稳定的频率，1K不好买，可以用40K，分频得到1KHz 当然，这还是方波 用一个锁相环跟踪这个频率，DCO出来的就是稳稳当当的1KHz正弦 |
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| 5楼： | >>参与讨论 |
| 作者： iC921 于 2006/3/17 17:43:00 发布：
晕，500MV--3V 这个写法是严重错误的！ |
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| 6楼： | >>参与讨论 |
| 作者： likee 于 2006/3/18 23:48:00 发布：
呵呵,是哦 虽然常见,但是不仔细看不出来 |
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| 7楼： | >>参与讨论 |
| 作者： maolei21ic 于 2006/3/19 0:19:00 发布：
NI的方案 Sine-Wave-Generation Techniques Typical Typical Typical Type Frequency Distortion Amplitude Comments Range (%) Stability (%) hase Shift 10 Hz–1 MHz 1–3 3 (Tighter Simple, inexpensive technique. Easily amplitude servo with Servo controlled. Resistively tunable over 2:1 range with CONTROL) little trouble. GOOD choice for cost-sensitive, moderate- performance applications. Quick starting and settling. ein BRIDGE 1 Hz–1 MHz 0.01 1 Extremely low distortion. Excellent for high-grade instrumentation and AUDIO applications. Relatively difficult to tune—requires DUAL variable RESISTOR with GOOD tracking. Take considerable time to settle after a step change in frequency or amplitude. C 1 kHz–10 MHz 1–3 3 Difficult to tune over wide ranges. Higher Q than RC egative types. Quick starting and easy to operate in high esistance frequency ranges. uning Fork 60 Hz–3 kHz 0.25 0.01 Frequency-stable over wide ranges of temperature and supply voltage. Relatively unaffected by severe shock or vibration. Basically untunable. rystal 30 kHz–200 MHz 0.1 1 Highest frequency stability. ONLY slight (ppm) tuning possible. Fragile. riangle- < 1 Hz–500 kHz 1–2 1 Wide tuning range possible with quick settling to new riven Break- frequency or amplitude. oint Shaper riangle- < 1 Hz–500 kHz 0.3 0.25 Wide tuning range possible with quick settling to new riven frequency or amplitude. Triangle and square wave also ogarithmic available. Excellent choice for general-purpose haper requirements needing frequency-sweep capability with low-distortion OUTPUT. AC-Driven <1 Hz–500 kHz 0.3 0.25 Similar to above but DAC-generated triangle wave ogarithmic generally easier to amplitude-stabilize or vary. Also, haper DAC can be addressed by counters synchronized to a MASTER SYSTEM clock. OM-Driven 1 Hz–20 MHz 0.1 0.01 Powerful DIGITAL technique that yields FAST amplitude AC and frequency slewing with little dynamic error. Chief detriments are requirements for high-speed clock (e.g., 8-bit DAC requires a clock that is 256 x OUTPUT sine wave frequency) and DAC glitching and settling, which will introduce significant distortion as OUTPUT frequency increases. |
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| 8楼： | >>参与讨论 |
| 作者： iC921 于 2006/3/19 18:33:00 发布：
500MV也太恐怖了吧？ |
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| 9楼： | >>参与讨论 |
| 作者： xiaopig769 于 2006/3/20 8:10:00 发布：
有什好办法继续看看 是500mv--3v，因为急忙写错了，请求各位帮忙啦 |
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