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 m 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.

• Type: Conference
• Year: 2008
• Where: ASPDAC
• Authors: Hong Phuc Ninh, Takashi Moue, Takashi Kurashina, Kenichi Okada, Akira Matsuzawa
• Keywords: ASPDAC 2008, Direct Sampling Mixer, Hardware, Lower Flicker Noise, Multi-band Receivers