Open AccessGeneralised approach for active‐RC quadrature oscillator circuit with grounded capacitors
Author(s) -
Maheshwari Sudhanshu
Publication year - 2020
Publication title -
iet circuits, devices and systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.251
H-Index - 49
eISSN - 1751-8598
pISSN - 1751-858X
DOI - 10.1049/iet-cds.2019.0176
Subject(s) - quadrature (astronomy) , capacitor , rc oscillator , electronic engineering , mathematics , topology (electrical circuits) , electrical engineering , engineering , vackář oscillator , voltage , local oscillator , phase noise
This study introduces a new approach for realising a sinusoidal oscillator with three outputs, using an active‐resistor‐capacitor (RC) approach. Using the proposed approach, a new circuit employing three current feedback operational amplifiers and passive components is further introduced. The circuit employs two grounded capacitors and four resistors, out of which one is grounded. The new circuit based on the proposed generalised approach is relatively insensitive to the parasitic effects of active elements, and easy to design, by way of non‐interaction of frequency and condition of oscillations. The proposed approach and the new proposed circuit provide three outputs, two of which are at low impedance nodes. The proposed generalised approach and the new circuit are verified through simulation and experimental results, using commercially available AD‐844s integrated circuits and passive components. Thus, the work advances the existing knowledge on the active‐RC oscillator design.