A CMOS 1.5-bit ΣΔ digital IF to RF transmitter for WCDMA application

Yongping Han, Shahin Mehdizad Taleie, Tino Copani, Bertan Bakkaloglu, Sayfe Kiaei

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A digital intermediate frequency (IF) to RF transmitter targeted for 2GHz wideband code division multiple access (WCDMA) is presented. The proposed transmitter integrates a 3-level digital IF current-steering cell, an up-conversion mixer with a tuned load and an RF variable gain amplifier (RF VGA) with an embedded semi-digital finite impulse response (FIR) reconstruction filter. A 4th-order 1.5-b IF bandpass sigma delta modulator (BP ΣΔM) is designed to guarantee in-band signal-to-noise ratio (SNR) and error vector magnitude (EVM) performances while the out-of-band quantization noise due to noise shaping is suppressed by the embedded FIR reconstruction filter to meet spectrum emission mask and ACPR requirements. The on-chip RF VGA provides 50dB power scaling in 10-dB steps with less than 1dB gain error. Together with the power control at the ΣΔM stage, the 74-dB dynamic range at RF frequency is achieved. The design is fabricated in a 4-metal 0.18-μm CMOS technology with a total core area of 0.8 × 1.6 mm 2. The IC delivers 0dBm output power to the 50Ω load at 2GHz and it draws approximately 120mA from a 1.8V DC supply at the maximum output power.

Original languageEnglish (US)
Title of host publicationIMEKO TC4 International Workshop on ADC Modelling, Testing and Data Converter Analysis and Design 2011, IWADC 2011 and IEEE 2011 ADC Forum
Pages191-196
Number of pages6
StatePublished - Dec 1 2011
EventIMEKO TC4 International Workshop on ADC Modelling, Testing and Data Converter Analysis and Design 2011, IWADC 2011 and IEEE 2011 ADC Forum - Orvieto, Italy
Duration: Jun 30 2011Jul 1 2011

Publication series

NameIMEKO TC4 International Workshop on ADC Modelling, Testing and Data Converter Analysis and Design 2011, IWADC 2011 and IEEE 2011 ADC Forum

Other

OtherIMEKO TC4 International Workshop on ADC Modelling, Testing and Data Converter Analysis and Design 2011, IWADC 2011 and IEEE 2011 ADC Forum
CountryItaly
CityOrvieto
Period6/30/117/1/11

Keywords

  • Digital IF
  • Digital to analog converters (DACs)
  • Digital transmitter
  • RF variable gain amplifier (RF VGA)
  • Sigma-delta modulator (ΣΔM)
  • Wideband code division multiple access (WCDMA)

ASJC Scopus subject areas

  • Modeling and Simulation

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  • Cite this

    Han, Y., Taleie, S. M., Copani, T., Bakkaloglu, B., & Kiaei, S. (2011). A CMOS 1.5-bit ΣΔ digital IF to RF transmitter for WCDMA application. In IMEKO TC4 International Workshop on ADC Modelling, Testing and Data Converter Analysis and Design 2011, IWADC 2011 and IEEE 2011 ADC Forum (pp. 191-196). (IMEKO TC4 International Workshop on ADC Modelling, Testing and Data Converter Analysis and Design 2011, IWADC 2011 and IEEE 2011 ADC Forum).