基于TFT彩屏液晶的便攜數(shù)字存儲(chǔ)示波器

摘 要:設(shè)計(jì)了一種以TFT彩屏液晶模塊為顯示器件的新型便攜數(shù)字存儲(chǔ)示波器。示波器的信號(hào)調(diào)理電路通過(guò)CA3338E的輸出信號(hào)控制兩級(jí)AD603放大，結(jié)合單片機(jī)控制繼電器對(duì)信號(hào)進(jìn)行衰減，實(shí)現(xiàn)了程控衰減放大和自動(dòng)增益控制的功能。對(duì)于A/D采集到的信號(hào)，在單片機(jī)內(nèi)部開(kāi)辟RAM存儲(chǔ)區(qū)對(duì)波形數(shù)據(jù)進(jìn)行循環(huán)緩存，達(dá)到了邊采集邊顯示的控制效果。在對(duì)波形顯示的控制中，使用數(shù)字化的觸發(fā)器代替?zhèn)鹘y(tǒng)的硬件觸發(fā)電路，降低了系統(tǒng)的復(fù)雜度，借助于正弦插值技術(shù)，使屏幕顯示的波形連續(xù)穩(wěn)定。該示波器可以用來(lái)顯示常用信號(hào)的波形，并進(jìn)行相關(guān)參數(shù)的測(cè)量顯示，具有輸入信號(hào)的動(dòng)態(tài)范圍大，體積小，便于攜帶的優(yōu)點(diǎn)，具有廣泛的應(yīng)用空間。關(guān)鍵詞:TFT液晶; 數(shù)字存儲(chǔ)示波器; 自動(dòng)增益控制; 插值函數(shù)

中圖分類(lèi)號(hào):TN94-34文獻(xiàn)標(biāo)識(shí)碼:A

文章編號(hào):1004-373X(2010)18-0166-04

Portable DSO Based on TFT Colorized LCD

DING Hao， SONG Jie， GUAN Jian

(Research Institute of Information Fusion， Naval Aeronautical and Astronautical University， Yantai 264001， China)

Abstract: A new kind of portable digital storage oscilloscope (DSO) with TFT colorized LCD as its display device is developed. The signal modulation circuit of the oscilloscope uses the output signal of CA3338E to control the amplification of the two-order AD603. The attenuation of input signal is implemented by relays controlled by MCU. The function of both program-controlled attenuation/amplification and automatic gain control are realized. For the digital signal acquired by A/D chips， two slices of RAM are adopted to restore the wave data in the form of cycle storage， thus the effect of acquisition while displaying is realized. As for the control of the waveform display， a digital trigger is designed instead of the traditional hardware triggering circuits. In this way， the complexity of the system is reduced. With the help of sinusoidal interpolation algorithm， the wave displayed on the screen is both continuous and stable. This kind of oscilloscope can be used to display the wave of common signals， and measure the relevant parameters in the meanwhile. It has a wide dynamic range for the input signal and a broad space of application， and is small in size and portable.

Keywords: TFT LCD; digital storage oscilloscope; AGC; interpolation function

收稿日期:2010-04-23

基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目(60672140);全國(guó)優(yōu)秀博士學(xué)位論文作者專(zhuān)項(xiàng)基金資助項(xiàng)目(200237)

在電子技術(shù)領(lǐng)域中，通常需要借助于一些輔助的儀器來(lái)觀察電路中信號(hào)的相互關(guān)系，這些儀器的種類(lèi)很多，比如萬(wàn)用表、信號(hào)源、示波器、頻譜儀等。其中，示波器可以觀察到信號(hào)的全貌，它可以在顯示屏幕上直接觀察到被測(cè)信號(hào)的波形，并測(cè)量信號(hào)的幅度、頻率、周期等基本參量。除此之外，其他的非電量也可以轉(zhuǎn)化為電量，使用示波器進(jìn)行觀測(cè)[1]。因此，示波器得到了廣泛的應(yīng)用。

隨著電子設(shè)備復(fù)雜程度的增加，對(duì)于示波器這樣的測(cè)量?jī)x器也提出了更多的要求，除了成本的限制以外，在體積、性能以及使用的靈活性方面也有了新的要求。……