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這樣的精度大家看看 |
| 作者：xiaopig769 欄目：模擬技術(shù) |
我現(xiàn)在想做一個(gè)幅度在500MV--3V可調(diào)，頻率為1KHZ，正負(fù)偏差不超過10HZ的正弦震蕩電路，有什么辦法可以達(dá)到這個(gè)精度呢，如果是普通的RC串并聯(lián)加上正反饋產(chǎn)生的，達(dá)不到這樣哦，好郁悶，大家?guī)兔纯?br> |
| 2樓： | >>參與討論 |
| 作者： t-z-sh 于 2006/3/16 16:51:00 發(fā)布：
能買到1k的晶體不？ |
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| 3樓： | >>參與討論 |
| 作者： qczq 于 2006/3/16 20:09:00 發(fā)布：
ML2037 ML2037: 500kHz, Serial Input, Programmable, Sine Wave Generator with DIGITAL Gain CONTROL |
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| 4樓： | >>參與討論 |
| 作者： sharks 于 2006/3/17 11:36:00 發(fā)布：
給你一個(gè)10元以下的方案 用晶體產(chǎn)生一個(gè)穩(wěn)定的頻率，1K不好買，可以用40K，分頻得到1KHz 當(dāng)然，這還是方波 用一個(gè)鎖相環(huán)跟蹤這個(gè)頻率，DCO出來的就是穩(wěn)穩(wěn)當(dāng)當(dāng)?shù)?KHz正弦 |
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| 5樓： | >>參與討論 |
| 作者： iC921 于 2006/3/17 17:43:00 發(fā)布：
暈，500MV--3V 這個(gè)寫法是嚴(yán)重錯(cuò)誤的！ |
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| 6樓： | >>參與討論 |
| 作者： likee 于 2006/3/18 23:48:00 發(fā)布：
呵呵,是哦 雖然常見,但是不仔細(xì)看不出來 |
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| 7樓： | >>參與討論 |
| 作者： maolei21ic 于 2006/3/19 0:19:00 發(fā)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樓： | >>參與討論 |
| 作者： iC921 于 2006/3/19 18:33:00 發(fā)布：
500MV也太恐怖了吧？ |
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| 9樓： | >>參與討論 |
| 作者： xiaopig769 于 2006/3/20 8:10:00 發(fā)布：
有什好辦法繼續(xù)看看 是500mv--3v，因?yàn)榧泵戝e(cuò)了，請(qǐng)求各位幫忙啦 |
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