H. Ninh, Takashi Moue, T. Kurashina, K. Okada, A. Matsuzawa
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引用次数: 0
摘要
提出了一种基于开关电容滤波(SCF)的直接采样混频器(DSM)。与传统电路相比,该电路具有更高的增益、更大的灵活性和更低的闪烁噪声。采用0.18 μ m CMOS工艺制作了用于数字地面电视(ISDB-T) 1段的混频器,并给出了采样频率为800 MHz时的测量结果。实验结果表明,信号带宽为430khz,假设偏移量为3mhz时,相邻干扰的衰减为27.3 dB。
A CMOS direct sampling mixer using Switched Capacitor Filter technique for software-defined radio
This paper proposes a novel direct sampling mixer (DSM) using switched capacitor filter (SCF) for multi-band receivers. The proposed DSM has a higher gain, more flexibility and lower flicker noise than that of conventional circuits. The mixer for digital terrestrial television (ISDB-T) 1-segment was fabricated in a 0.18 mum CMOS process, and measured results are presented for a sampling frequency of 800 MHz. The experimental results exhibit 430 kHz signal bandwith with 27.3 dB attenuation of adjacent interferer assuming at 3 MHz offset.