欠采樣中頻收發(fā)器體系結(jié)構(gòu)研究

提出了一個(gè)欠采樣中頻收發(fā)器的體系結(jié)構(gòu)，它在中頻數(shù)字化以前先通過欠采樣將中頻頻率變到一個(gè)較低的頻率。該結(jié)構(gòu)在ADC 之前不需要鏡像抑制濾波器且只有一條模擬路
徑，通過在數(shù)字域產(chǎn)生I/Q 路徑避免了IQ 失配，由于采用了獨(dú)特的頻率分配方案而簡化了頻率合成器的設(shè)計(jì)。而且，本文為收發(fā)器設(shè)計(jì)了一個(gè)數(shù)字下變頻器，它成本低且易于集成。
關(guān)鍵詞：無線局域網(wǎng)；收發(fā)器；欠采樣；數(shù)字下變頻
Abstract: A receiver architecture is presented that utilizes the subsampling concept to
down-convert the IF signal to a lower IF before been digitized. The receiver does not need an
anti-aliasing filter before the ADC, and only uses a single path until the ADC and generates the I and Q paths in digital domain to avoid I-Q analog mismatches. This architecture utilizes a unique frequency plan which simplify the design of the frequency synthesizer. Furthermore, a low cost digital down converter(DDC) was introduced, which is fit for the SOC design of the transceiver.
Key words: WLAN; transceiver; subsampling; digital down converter