A Prototype SAW-Less LTE Transmitter with a High-Linearity Modulator Using BPF-Based I/Q Summing and a Triple-Layer Marchand Balun

Takahiro Nakamura, Naoki Kitazawa, Kaoru Kohira, Hiroki Ishikuro

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A 65-nm CMOS-technology-based surface-acoustic-wave filterless transmitter (TX) for a long-term evolution (LTE) system was developed and performance tested. The TX incorporates both a passive quadrature modulator (QMOD) using bandpass filter (BPF)-based in-phase/quadrature (I/Q) signal summing and a small triple-layer Marchand balun. The passive operation and BPF-based I/Q summing, respectively, contribute to low noise performance and high input impedance (seen from the baseband signal), resulting in low receiver (RX) band noise and high linearity of the TX. The triple-layer Marchand balun contributes to the small area of the TX. A prototype LTE TX using the QMOD and the balun exhibits in-specification RX-band noise (2).

Original languageEnglish
Article number7303973
Pages (from-to)4090-4097
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Volume63
Issue number12
DOIs
Publication statusPublished - 2015 Dec 1

Fingerprint

Long Term Evolution (LTE)
Bandpass filters
bandpass filters
quadratures
transmitters
Modulators
linearity
modulators
Transmitters
prototypes
Surface waves
Acoustic waves
Specifications
low noise
specifications
CMOS
receivers
impedance
acoustics

Keywords

  • Bandpass filter (BPF)-based in-phase/quadrature (I/Q) summing
  • long-term evolution (LTE)
  • surface acoustic wave (SAW)-less
  • triple-layer Marchand balun

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Radiation

Cite this

A Prototype SAW-Less LTE Transmitter with a High-Linearity Modulator Using BPF-Based I/Q Summing and a Triple-Layer Marchand Balun. / Nakamura, Takahiro; Kitazawa, Naoki; Kohira, Kaoru; Ishikuro, Hiroki.

In: IEEE Transactions on Microwave Theory and Techniques, Vol. 63, No. 12, 7303973, 01.12.2015, p. 4090-4097.

Research output: Contribution to journalArticle

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