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Cancellation method of Second Order Distortion and DC-Offset in Down-Conversion Mixer  

Jung, Jae-Hoon (Div. of Elec. and Computer Eng., Hanyang Univ.)
Hwang, Bo-Hyun (Div. of Elec. and Computer Eng., Hanyang Univ.)
Kim, Shin-Nyoung (Div. of Elec. and Computer Eng., Hanyang Univ.)
Jeong, Chan-Young (Div. of Elec. and Computer Eng., Hanyang Univ.)
Lee, Mi-Young (Div. of Elec. and Computer Eng., Hanyang Univ.)
Yoo, Chang-Sik (Div. of Elec. and Computer Eng., Hanyang Univ.)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.43, no.10, 2006 , pp. 97-103 More about this Journal
Abstract
This paper presents the method of improving second order intermodulation distortion(IMD2) and dc-offset problems in down-conversion mixer. A simple analysis reveals the IMD2 and dc-offset can be eliminated by controlling the duty cycles of local oscillator(LO) inputs. A mixer with the proposed method has been simulated with a $0.13{\mu}m$ RF CMOS technology with 5% mismatch in the load resistance, the mixer shows 2.04dBm IIP2 and 22mnV input referred DC-offset. By controlling two duty cycles of LO inputs, IIP2 and DC-offset can be improved to 38.8dBm and $777{\mu}V$, respectively.
Keywords
second order intermodulation distortion, IMD2; DC-offset; down-conversion mixer;
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