一種新型的5GHz自適應(yīng)偏置及可變?cè)鲆娴驮肼暦糯笃?/h2>
A New 5GHz Adaptively-Biased and Variable Gain Low Noise Amplifier
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摘要: 該文提出了一種新型的自適應(yīng)偏置及可變?cè)鲆娴驮肼暦糯笃?LNA)，利用電荷泵(亦稱電壓倍增器)將LNA輸出信號(hào)轉(zhuǎn)換成與LNA射頻輸入信號(hào)功率成比例變化的直流信號(hào)，以此信號(hào)同時(shí)反饋控制LNA的偏置和增益，來(lái)實(shí)現(xiàn)自適應(yīng)偏置以及可變?cè)鲆娴驮肼暦糯笃? 從而極大地改善了LNA的輸入線性范圍。鑒于5GHz頻率下，Bipolar相對(duì)于CMOS更好的頻率特性和低噪聲特性，該項(xiàng)研究采用了BiCMOS工藝，實(shí)現(xiàn)了低于3.0dB的噪聲系數(shù)(高增益狀態(tài)下)和大約13dBm的輸入三階交調(diào)點(diǎn)IIP3的控制范圍以及大于15dB的增益控制范圍。
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關(guān)鍵詞:
- 低噪聲放大器;自適應(yīng)偏置;可變?cè)鲆?電荷泵
Abstract: In this paper, a new Low Noise Amplifier (LNA) with adaptive-biasing and variable gain is presented, in which charge pump is used to convert the RF output signal of LNA into a dc control signal, the amplitude of which should be proportional to the input RF magnitude. By using this signal to control bias and gain of LNA simultaneously, the linearity of LNA is greatly improved. In 5GHz frequency, bipolar transistors exhibit better frequency and noise performance, so in this paper, BiCMOS technology is used. The LNA exhibits a noise figure of no more than 3.0dB (in the high gain mode), about 13dBm IIP3 improvement and gain tuning range of more than 15dB. -
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