• A 1 V CMOS programmable accurate charge pump with wide output voltage range 

      Tsitouras, A.; Plessas, F.; Birbas, M.; Kalivas, G. (2011)
      A 1 V, programmable, accurate, high speed, single-ended charge pump is proposed, suitable for low voltage PLLs. It is designed in TSMC 90-nm digital CMOS process and it consists of four switches in a current steering ...
    • 5-GHz fully differential multifunctional circuit 

      Plessas, F.; Tsitouras, A.; Kalivas, G. (2012)
      This letter presents a multifunctional circuit realising the functions of oscillation, frequency multiplication and frequency division at 5-GHz. A theoretical and experimental description of the circuit is given. The ...
    • A linear, ultra wideband, low-power, 2.1-5 GHz, VCO 

      Tsitouras, A.; Plessas, F.; Kalivas, G. (2011)
      A linear, Ultra Wideband, low-power VCO, suitable for UWB-FM applications is proposed, forming the main part of a UWB-FM transmitter. The VCO is designed in TSMC 90 nm digital CMOS process and includes a Source-Coupled ...
    • Phase noise characterization of subharmonic injection locked oscillators 

      Plessas, F.; Tsitouras, A.; Kalivas, G. (2011)
      In this work we present a detailed study of the phase noise of subharmonic injection locked oscillators (s-ILOs). A new simple and efficient model has been presented for accurately predicting the phase noise of a microwave ...
    • Phase noise performance of fully differential sub-harmonic injection-locked PLL 

      Plessas, F.; Gioulekas, F.; Kalivas, G. (2010)
      A fully differential sub-harmonic injection-locked phase-locked loop (PLL) that achieves improved levels of phase noise performance through the incorporation of injection locking and fully differential architecture is ...
    • A sub-1V supply CMOS voltage reference generator 

      Tsitouras, A.; Plessas, F.; Birbas, M.; Kikidis, J.; Kalivas, G. (2012)
      An integrated sub-1V voltage reference generator, designed in standard 90-nm CMOS technology, is presented in this paper. The proposed voltage reference circuit consists of a conventional bandgap core based on the use of ...