• Publications
  • Influence
A /spl Sigma/-/spl Delta/ fractional-N frequency synthesizer using a wide-band integrated VCO and a fast AFC technique for GSM/GPRS/WCDMA applications
TLDR
A fractional-N frequency synthesizer (FNFS) in a 0.5-/spl mu/m SiGe BiCMOS technology is implemented for GSM/GPRS/WCDMA applications. Expand
  • 99
  • 4
Phase frequency detectors for fast frequency acquisition in zero-dead-zone CPPLLs for mobile communication systems
TLDR
This paper introduces a new-type phase-frequency-detector for charge pump phase-locked-loops (CPPLLs). Expand
  • 37
  • 4
12.9 A fully integrated 6W wireless power receiver operating at 6.78MHz with magnetic resonance coupling
TLDR
Wireless power transfer (WPT) systems are becoming ubiquitous with applications in powering medical implants and a range of portable consumer electronic devices such as smart phones and wearable devices. Expand
  • 48
  • 3
A /spl Sigma/-/spl Delta/ fractional-N frequency synthesizer using a wideband integrated VCO and a fast AFC technique for GSM/GPRS/WCDMA applications
TLDR
A fractional-N frequency synthesizer (FNFS) in a 0.5-/spl mu/m SiGe BiCMOS technology for GSM/GPRS/WCDMA applications. Expand
  • 39
  • 2
Fast AFC technique using a code estimation and binary search algorithm for wideband frequency synthesis
TLDR
We introduce an adaptive frequency calibration (AFC) technique, which is using a code estimation and binary search algorithm to reduce the number of comparisons in AFC mode to improve locking property in wideband frequency synthesizers. Expand
  • 11
  • 2
2.7 A hybrid supply modulator with 10dB ET operation dynamic range achieving a PAE of 42.6% at 27.0dBm PA output power
  • S. Lee, Ji-Seon Paek, +12 authors I. Kang
  • Engineering, Computer Science
  • IEEE International Solid-State Circuits…
  • 19 March 2015
TLDR
Envelope tracking (ET) prolongs the battery life by modulating the supply of a power amplifier (PA) according to the signal envelope. Expand
  • 20
  • 1
A ΔΣ fractional-N synthesizer with customized noise shaping for WCDMA/HSDPA applications
TLDR
This paper describes a quantization noise reduction method in DeltaSigma fractional-N synthesizer design based on a semidigital approach. Expand
  • 27
  • 1
  • PDF
A Wideband 0.18-μm CMOS ΔΣ Fractional-N Frequency Synthesizer with a single VCO for DVB-T
TLDR
This paper describes the design of the DeltaSigma fractional-N frequency synthesizer for digital video broadcasting-terrestrial (DVB-T) receiver, which is fabricated in a 0.18-mum CMOS technology. Expand
  • 16
  • 1
Enhanced ACPR technique by class AB in PCS driver amplifier
Simplified relationship between the intermodulation distortion ratio (IM3) on two tone test and the ACPR in CDMA signal test is derived. Due to better linearity (decreased intermodulation distortionExpand
  • 15
  • 1
Dual-Path $LC$ VCO Design With Partitioned Coarse-Tuning Control in 65 nm CMOS
  • Y. Sun, X. Yu, +4 authors Z. Wang
  • Materials Science
  • IEEE Microwave and Wireless Components Letters
  • 29 January 2010
This letter describes a dual-path LC voltage controlled oscillator (VCO) design that reduces both coarse-tuning and fine-tuning sensitivities. By using a combination of discrete and continuous tuningExpand
  • 12
  • 1