KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Phatsornsiri, PunnavichSubject: search.filters.subject.quadrature oscillator

Search Results

Now showing 1 - 3 of 3
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Tunable current-mode quadrature oscillator using CFTAs and grounded capacitors
    (2015-08-17)
    Phatsornsiri, Punnavich
    ;
    Lamun, Panit
    In this paper, an electronically tunable current-mode quadrature oscillator employing three current follower trans-conductance amplifiers (CFTAs) and two grounded capacitors is proposed. The use of all grounded capacitors makes the proposed circuit ideal for integrated circuit implementation. The circuit provides two high-output impedance current signals with 90° phase difference. It condition of oscillation (CO) and frequency of oscillation (FO) can be adjusted independently and electronically. The active and passive sensitivities of the proposed configuration are low. PSPICE simulation results using TSMC 0.25 μm CMOS process parameters are given to prove the theory.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Mixed-mode quadrature oscillator using a single DDCCTA and grounded passive components
    (2015-01-01)
    Phatsornsiri, Punnavich
    ;
    Lamun, Panit
    ;
    Kumngern, Montree
    A new mixed-mode quadrature oscillator using a single differential difference current conveyor transconductance amplifier (DDCCTA), two grounded resistors, and two grounded capacitors is presented. The proposed circuit provides both quadrature voltage and quadrature current outputs simultaneously. The condition of oscillation (CO) and frequency of oscillation (FO) of the circuit are orthogonally controllable. The circuit is beneficial to monolithic integrated circuit implementation by using all grounded passive components. Moreover, the active and passive sensitivities of the proposed configuration are low. The validity of the proposed oscillator has been established by PSPICE simulations using MIETEC 0.5 μm CMOS technology.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Current-mode third-order quadrature oscillator using VDTAs and grounded capacitors
    (2014-01-01)
    Phatsornsiri, Punnavich
    ;
    Lamun, Panit
    ;
    Kumngern, Montree
    ;
    Torteanchai, Usa
    This paper presents a novel electronically tunable current-mode third-order quadrature oscillator based on voltage differencing transconductance amplifier (VDTA). The proposed oscillator is constructed using two VDTAs and three grounded capacitors, which is advantageous for integrated circuit implementation. The circuit provides two current outputs with 90° phase difference from high output impedance terminals. The condition of oscillation and the frequency of oscillation can be electronically tuned by adjusting the bias current of the VDTAs. The sensitivity studies of the circuit have been carried out. PSPICE simulations with 0.35 μm TSMC CMOS process parameters are given to confirm the theoretical analysis. © 2014 IEEE.