A 3.3-V ISDN U-interface line driver with a new IQ-control circuit

Jinup Lim, Sungwon Noh, Kwangoh Kim, Joongho Choi

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


In this brief, we propose a new quiescent current (IQ) control circuit applicable to line drivers for digital subscriber line (DSL) applications. The line driver consists of pre-amplifier, error amplifiers, output transistors, and IQ control circuits. A new method is proposed for controlling IQ values in order to obtain high linearity performance. It also helps to determine the minimum off-current value of the class-AB output stage to reduce crossover distortion. The line driver is implemented for ISDN U-interface applications. It is fabricated in a 0.35-μm CMOS technology for a single power supply voltage of 3.3 V, and a total harmonic distortion of less than -64 dB is achieved.

Original languageEnglish
Pages (from-to)1421-1424
Number of pages4
JournalIEEE Journal of Solid-State Circuits
Issue number8
StatePublished - Aug 2003


  • CMOS
  • Class AB
  • Line driver
  • Low power
  • Low voltage


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