A Low-Noise WLAN Mixer Using Switched Biasing Technique
- Authors
- Kim, Jong-Ha; An, Hee-Woo; Yun, Tae-Yeoul
- Issue Date
- Oct-2009
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Current bleeding; flicker noise; low noise; mixer; switched biasing
- Citation
- IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, v.19, no.10, pp.650 - 652
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
- Volume
- 19
- Number
- 10
- Start Page
- 650
- End Page
- 652
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/176110
- DOI
- 10.1109/LMWC.2009.2029746
- ISSN
- 1531-1309
- Abstract
- A low-noise CMOS down-conversion mixer for WLAN applications is presented in this letter. The proposed mixer is based on the conventional Gilbert-type topology with switched biasing technique for a current source instead of static biasing, which lowers noise over a wide range of frequencies. Moreover, a dc level shifter is used for the symmetric switching operation in tail current transistors. A current bleeding technique is adopted to reduce the noise caused by the LO switching operation. The proposed mixer was fabricated using a 0.18 mu m 1P6M CMOS process. Measurement results include a conversion gain of 7.5 dB, an IIP3 of -5 dBm, and noise figures of 10.9 dB at 1 MHz and 7.6 dB at 100 MHz. The mixer core consumes a current of 4.5 mA from a supply voltage of 1.8 V. The chip size, including pads for measurements, is 0.88 x 0.88 mm(2).
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