需要金幣:![]() ![]() |
資料包括:完整論文 | ![]() |
![]() |
轉(zhuǎn)換比率:金額 X 10=金幣數(shù)量, 例100元=1000金幣 | 論文字數(shù):10742 | ![]() | |
折扣與優(yōu)惠:團購最低可5折優(yōu)惠 - 了解詳情 | 論文格式:Word格式(*.doc) | ![]() |
摘要:由于模擬示波器CRT的余暉時間很短,很難顯示頻率很低的信號且具有快速上升、下降時間的低重復速率信號就很難顯示,而數(shù)字示波器的掃描軌跡亮度和掃描速度與信號重復速率無關(guān),故可以很好地反映出來。利用FPGA的速度和計算優(yōu)勢,進而分析顯示出信號各種參數(shù)。 本設(shè)計運用單片機和FPGA進行雙CPU控制,配合交直流切換模塊、繼電器模塊、緩沖器模塊、可控集成運算放大器模塊、增益可控模塊、波形線基準電平控制電路、AD采樣芯片和TFT彩色液晶,完成信號波形數(shù)據(jù)處理及顯示的功能。 雙CPU指的是按鍵掃描用ATMega8單片機來掃描,AD以及其他TFT顯示等用FPGA來編程實現(xiàn);增加了按鍵軟開機和PWM控制屏幕漸亮漸滅功能,實用性得到增強;FIFO存儲電路、顯示控制電路、時鐘產(chǎn)生電路、測頻與控制電路這幾部分電路設(shè)計在FPGA內(nèi)部,使得程序設(shè)計比較方便。利用FPGA速度優(yōu)勢和計算優(yōu)勢,同時利用單片機價格優(yōu)勢設(shè)計,提高波形顯示和處理精度,而且運用高對比度顯示器件提高便攜式時代野外性能。 此設(shè)計成果可以顯示任意波形(頻率帶寬在20MHz、可實現(xiàn)正弦波頻率3~5MHz、方波500KHz)。還實現(xiàn)了示波器的頻率計算、幅值計算、FFT變換及雙通道信號輸入。 關(guān)鍵字:示波器;單片機;FPGA
ABSTRACT:Due to the very short afterglow time analog oscilloscope CRT, It's hard to show a low frequency signal and with fast rise and fall times of the low repeat rate signal is less likely to show, However scanning scan digital oscilloscope trace brightness and fast repeat rate has nothing to do with signal, it can be reflected very well. Using FPGA speed and calculation of advantage, further analysis showed the signal parameters. This double CPU and FPGA design using single-chip microcomputer control, combined with, relay modules, AC-DC switching module buffer modules, control module, integrated operational amplifier gain control module, wavy line datum level, AD sample chips of control circuit and TFT color LCD, complete signal waveform data processing and display functions. Double CPU means of is press scan with ATMega8 single tablets machine to scan, AD and other TFT displayed, with FPGA to programming implementation; increased has press soft power and PWM control screen gradually light gradually fight function, practical are enhanced; FIFO storage circuit, and displayed control circuit, and clock produced circuit, and measuring frequency and control circuit this several part circuit design in FPGA internal, makes programming comparison easy. Using FPGA speed and computing advantages and price advantage using single-chip design, improving the waveform display and handling precision and using high-contrast display devices to improve portable field performance of the times. This design any waveform can be displayed (20MHz, frequency bandwidth can achieve 3~5MHz sine wave frequency, wave 500KHz). Also implements the oscilloscope frequency amplitude calculation, calculation, and dual channel FFT transform a signal input. Keywords: Oscilloscope;Single-chip computer;FPGA
|