D. Heo

Publications (4)2.68 Total impact

• Article: Analysis of resonator phase shift for two series LC quadrature VCOs

  Y. Zhang, P. Upadhyaya, L. Peng, D. Rector, D. Heo
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  ABSTRACT: Based on the investigation of resonator phase shift, an analytical framework to compare the phase noise between two series LC quadrature voltage-controlled oscillators (QVCOs) is presented. The bottom- series QVCO is analytically demonstrated to have lower phase noise than the top-series QVCO. Simulation data show good agreement with the presented analysis.
  Electronics Letters 02/2008; · 0.96 Impact Factor
• Article: A Novel SiGe PIN Diode SPST Switch for Broadband T/R Module

  Pinping Sun, P. Upadhyaya, Dong-Ho Jeong, D. Heo, G.S. La Rue
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  ABSTRACT: A novel octagonal SiGe p-type intrinsic n-type (PIN) diode single pole single throw (SPST) switch is first implemented in a standard 0.18-mum SiGe BiCMOS technology. Distinctive radio frequency performance of monolithic silicon PIN diode switch is achieved for broadband applications with improvement of its geometry. Over the 2-16GHz frequency band, the PIN diode SPST switch exhibits an insertion loss of less than 1dB and isolation between 42dB to 19dB. An accurate small signal model of series PIN diode is also presented
  IEEE Microwave and Wireless Components Letters 06/2007; · 1.72 Impact Factor
• Source

  Available from: wsu.edu

  Conference Proceeding: Low power and low phase noise 5.7 GHz LC VCO in OOK transmitter for neurosensory application

  P. Upadhyaya, M. Rajashekharaiah, D. Heo, D.M. Rector, Yi-Jan Emery Chen
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  ABSTRACT: A 5.7 GHz fully integrated complementary LC voltage controlled oscillator (CLC VCO) has been designed in an inexpensive 0.25-μm digital CMOS process for low power neurosensory application. Consuming only 2mA of current from a 2.5 V power supply, the CLC VCO achieves a measured single-sideband phase noise of -92.75 dBc/Hz and -97.6 dBc/Hz at 600 KHz and 1.0 MHz offset frequency, respectively. The CLC VCO is able to output -5dBm of power at the single-ended output to a 50-Ohm load to meet demands of high-date rate short reach on-off keying (OOK) wireless transmission. Various low power techniques used to improve phase noise in the LC VCO are also discussed.
  Microwave Symposium Digest, 2005 IEEE MTT-S International; 07/2005
• Source

  Available from: wsu.edu

  Conference Proceeding: 100 Mbs OOK transmitter with low power and low phase noise LC VCO for neurosensory application

  P. Upadhyaya, M. Rajashekharaiah, D. Heo, D.M. Rector, Yi-Jan Emery Chen
  [show abstract] [hide abstract]
  ABSTRACT: A 5.7 GHz fully integrated complementary LC voltage controlled oscillator (CLC VCO) has been designed in an inexpensive 0.25-μm digital CMOS process targeting low power short reach 100 Mbs on-off keying wireless transmitter (OOK) for neurosensory application. Consuming only 2 mA of current from a 2.5 V power supply, the CLC VCO achieves a measured single-sideband phase noise of -92.75 dBc/Hz and -97.6 dBc/Hz at 600 KHz and 1.0 MHz offset frequency, respectively. The CLC VCO is able to output -5 dBm of power at the single-ended output to a 50 ohm load to meet demands of high-data rate short reach on-off keying wireless transmission. Various low power techniques used to improve phase noise in the LC VCO are also discussed.
  SoutheastCon, 2005. Proceedings. IEEE; 05/2005