描述
高采樣速率模數(shù)轉(zhuǎn)換器(ADC)通常用在現(xiàn)代無(wú)線接收器設(shè)計(jì)中,以中頻(IF)采樣速率采集復(fù)數(shù)調(diào)制的信號(hào)。這類(lèi)設(shè)計(jì)通常都選用基于CMOS開(kāi)關(guān)電容的ADC,因?yàn)樗鼈兊牡统杀竞偷凸奶攸c(diǎn)很吸引人。但這類(lèi)ADC采用一種直接連接到采樣網(wǎng)絡(luò)的無(wú)緩沖器的前端,這樣就會(huì)出現(xiàn)驅(qū)動(dòng)ADC的放大器的輸入跟蹤和保持阻抗隨時(shí)間變化的問(wèn)題。為了有效地驅(qū)動(dòng)ADC,使噪聲最低和有用信號(hào)失真最小,必須設(shè)計(jì)一種無(wú)源網(wǎng)絡(luò)接口幫助抑制寬帶噪聲,并對(duì)跟蹤阻抗和保持阻抗進(jìn)行變換以便為驅(qū)動(dòng)放大器提供更好的負(fù)載阻抗。針對(duì)幾種常見(jiàn)的IF頻率,本文中提出了一種諧振匹配方法,用于將跟蹤和保持阻抗轉(zhuǎn)換為比較容易計(jì)算的負(fù)載,從而實(shí)現(xiàn)抗鋸齒濾波器的精密設(shè)計(jì)。
開(kāi)關(guān)電容ADC
開(kāi)關(guān)電容ADC不帶緩沖器,以便能降低功耗。這種ADC的采樣保持放大器電路(SHA)主要包括一個(gè)輸入開(kāi)關(guān)、一個(gè)輸入采樣電容器、一個(gè)采樣開(kāi)關(guān)和一個(gè)放大器。如圖1所示,輸入開(kāi)關(guān)直接連接驅(qū)動(dòng)器和采樣電容器。輸入開(kāi)關(guān)閉合時(shí)(跟蹤模式),驅(qū)動(dòng)器電路驅(qū)動(dòng)輸入電容器,當(dāng)此模式結(jié)束時(shí),輸入電容器開(kāi)始對(duì)輸入信號(hào)進(jìn)行采樣(捕獲)。而當(dāng)輸入開(kāi)關(guān)斷開(kāi)時(shí)(保持模式),驅(qū)動(dòng)器被輸入電容器隔離。ADC的跟蹤模式周期和保持模式周期大約相等。
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