Analysis and Design of Feedforward Linearity-Improved Mixer Using Inductive Source Degeneration
- Authors
- Kim, Myoung-Gyun; Yun, Tae-Yeoul
- Issue Date
- Feb-2014
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Feedforward; linearity; mixer; third-order input intercept point (IIP3); third-order intermodulation distortion (IMD3)
- Citation
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, v.62, no.2, pp.323 - 331
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
- Volume
- 62
- Number
- 2
- Start Page
- 323
- End Page
- 331
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/160737
- DOI
- 10.1109/TMTT.2013.2295767
- ISSN
- 0018-9480
- Abstract
- This paper presents a new linearity-improvement feedforward transconductance stage using inductive source-degeneration amplifiers. The proposed technique is applied to a CMOS RF mixer based on a folded- type topology. Feedforward compensation is achieved by cancelling the third-order transconductance terms between the inverter and auxiliary amplifiers. From a new theoretical analysis of the nonlinearities of the proposed circuit, the third-order intermodulation distortion is eliminated by controlling the values of the source-degeneration inductances. The proposed mixer achieves a third-order input intercept point of 5.24 dBm, which is an improvement of 6.3 dB compared with that of the conventional structure, and has the highest figure-of-merit among other linearity improved mixers that have been previously reported.
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