Analysis and review of main characteristics of Colpitts oscillators. (31st March 2021)

• Record Type: Journal Article
• Authors: Hemmati, Mohammad Jafar; Dehghani, Rasoul
• Is Part Of: International journal of circuit theory and applications. Volume 49:Number 5(2021)
• Page Start: 1285
• Page End: 1306
• Publication Date: 2021-03-31
• Subjects: Colpitts -- gm‐boosted -- quadrature -- voltage‐controlled oscillator; Electric circuit analysis -- Periodicals; 621.319205
• DOI: 10.1002/cta.3006
• Languages: English
• ISSNs: 0098-9886

Abstract

Summary: In this review, different topologies of CMOS Colpitts oscillators including single‐ended and differential configurations are studied, and the main specifications of them are presented. The studied LC tank Colpitts oscillators operating at gigahertz frequencies are categorized in several main structures to have more insight into their comparison. Also, the main characteristics of the Colpitts voltage‐controlled oscillators (VCOs) are compared and analyzed according to their configurations and calculated results of their transconductances. Besides, the Colpitts quadrature voltage‐controlled oscillators (QVCOs) realized by the mentioned VCOs are studied and categorized. Also, the various coupling techniques adopted in each QVCO to generate output signals with 90° phase differences are highlighted. Abstract : This work presents a detailed review of Colpitts oscillators, which are widely used in the communication systems. In addition, a newly classification of the Colpitts oscillators including single‐ended and differential configurations is provided. Also, the main specifications of each one are presented, analyzed, and compared with the others. Besides, the Colpitts quadrature voltage‐controlled oscillators realized by the mentioned VCOs are surveyed and categorized to have more insight into their performances.