5.8 GHz 4.7 mA zero-IF passive mixer receiver using a step-down transformer for gain enhancement

Wei Ling Chang, Chin-Chun Meng, Chung Yo Lin, Guo Wei Huang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


This paper demonstrates a 5.8 GHz low-power, low-flicker-noise I/Q zero-IF receiver in 0.18-um CMOS process. Passive resistive mixers and deep-n-well vertical-NPN (V-NPN) bipolar junction transistors (BJTs) as the transconductance stage of the IF amplifier are employed to improve the flicker noise problem. The passive mixer is in current mode operation and thus a step-down transformer is used at the LNA output to enhance the current gain. By carefully designing the 4:2 step-down transformer, the conversion gain of the whole zero-IF receiver performs up to 51 dB when LO power is 6 dBm, and the 3-dB bandwidth covers 5.7-6.1 GHz with the current consumption of 4.7 mA at 1.8 V supply. The flicker noise corner is 100 kHz and the noise floor is 6.5 dB. The I/Q amplitude mismatch and phase difference are below 0.05 dB and 2.5°, respectively.

Original languageEnglish
Title of host publication2015 Asia-Pacific Microwave Conference, APMC 2015 - Proceedings
EditorsFan Meng, Wei Hong, Xiao-Wei Zhu, Guang-Qi Yang, Zhe Song
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479987658
StatePublished - 18 Feb 2016
EventAsia-Pacific Microwave Conference, APMC 2015 - Nanjing, China
Duration: 6 Dec 20159 Dec 2015

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


ConferenceAsia-Pacific Microwave Conference, APMC 2015


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