2.4 GHz 0.35 um CMOS single-ended LNA and mixer with gain enhancement techniques

Jen Yi Su*, Chin-Chun Meng, Yang Han Li, Sheng Che Tseng, Guo Wei Huang

*Corresponding author for this work

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

4 Scopus citations


Two major techniques for gain improvement of the CMOS low noise amplifier (LNA) and mixer are presented. First, the inductive interstage matching is applied to design a cascode amplifier for increasing the power transfer between the common source (CS) and common gate (CG) stages. Second, a super source follower (SSF) is utilized in a P-type micromixer for increasing the conversion gain of the mixer. A series of investigations are performed for demonstrating the feasibilities of the proposed techniques. The LNA and mixer designs based on the proposed techniques are realized using 0.35 um 1P4M CMOS technology. Then their measured results are compared with those of a preliminary design, which fully integrates a conventional cascode amplifier and a P-type micromixer. The gain of the LNA is increased 2.1 dB and the noise figure is maintained at the same value of the preliminary design. On the other hand, the conversion gain of the super source follower (SSF) of the micromixer output is improved about 9.5 dB. Such improvements reveal great potential of the proposed design techniques on the gain enhancement for the LNA and mixer. Then, the measured results of the preliminary design show the return-loss of 25 dB, the isolation of better than 30 dB and the conversion gain of 4.8 dB in the 2.4 GHz ISM band.

Original languageAmerican English
Title of host publicationAPMC 2005
Subtitle of host publicationAsia-Pacific Microwave Conference Proceedings 2005
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)078039433X, 9780780394339
StatePublished - 2005
EventAPMC 2005: Asia-Pacific Microwave Conference 2005 - Suzhou, China
Duration: 4 Dec 20057 Dec 2005

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


ConferenceAPMC 2005: Asia-Pacific Microwave Conference 2005


  • CMOS
  • Cascode amplifier
  • Interstage matching
  • LNA
  • Mixer


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