A voice-band audio processor IC for CDMA applications

Bertan Bakkaloglu, Brian L. Evans, D. George Gata, James R. Hellums, James J. Hidon, James R. Hochschild, Gary Lin, John M. Muza, Zhengwei Zhang

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

Abstract

A 2.7 V voice-band audio processor (VBAPTM) IC for CDMA wireless handsets as presented, The chip consists of transmit (uplink) and receive (downlink) audio channels and runs at a nominal current consumption of 9.1 mA. The transmit channel has two differential microphone inputs with external filtering and gain option for signal conditioning before a ΣΔ ADC. The transmit channel pre-emphasis filter, receive channel filter, part of transmit gain, receive gain, receive volume control and sidetone gains are achieved by a single DSP core. The receive channel has a differential and a single-ended speaker interface which can deliver 35 mW and 10 mW to a 32 ω load respectively. The PCM encoding and decoding can be achieved in both linear and μ-law companded modes. Due to the PLL/clock recovery circuitry the 13-bit ΣΔ voiceband codec is immune to system clock jitter up to 37%.

Original languageEnglish (US)
Title of host publicationProceedings - 1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages484-487
Number of pages4
ISBN (Electronic)0818689145
DOIs
StatePublished - Jan 1 1998
Externally publishedYes
Event1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998 - Notre Dame, United States
Duration: Aug 9 1998Aug 12 1998

Other

Other1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998
CountryUnited States
CityNotre Dame
Period8/9/988/12/98

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'A voice-band audio processor IC for CDMA applications'. Together they form a unique fingerprint.

Cite this