This article presents a frequency reference system that combines high accuracy and low power consumption using single-point temperature trim batch calibration. The is intended as low-cost fully integrated crystal oscillator replacement. In this system, the oscillation of power-efficient, but process, voltage, (PVT) lifetime (L)-sensitive current-controlled ring (CCO) periodically (re)calibrated...

This paper presents a temperature compensation voltage controlled oscillator (VCO) based on Cross-Coupled pair and Colpitts structures which is suitable for military fields. Also, two inductors have been used for increasing the negative conductance. By using this method, start-up condition has been improved. Two varactors and a simple capacitor bank are applied for covering a wide tunning range...

This paper presents a sensitivity-enhanced gas sensor based on a film bulk acoustic resonator (FBAR). It was designed and fabricated with micro through-holes in its top electrode for sensitivity enhancement. The sensor was driven by a Colpitts oscillator circuit, and the output signal had characteristics of a power of −2.6 dBm@3 V and a phase noise of −90 dBc/Hz@100 kHz. In order to test the pe...

Today’s analog/RF design and verification face significant challenges due to circuit complexity, process variations and short market windows. In particular, the influence of technology parameters on circuits, and the issues related to noise modeling and verification still remain a priority for many applications. Noise could be due to unwanted interaction between the circuit elements or it could...

[1] Sheng-Lyang Jang, Li-Te Chou and Chia-Wei Chang, ” Colpitts VCO with Gate-Series High-Quality Factor LC Resonator,” in press, Microwave and Optical Technology Lett., Oct. 2010. [2] M. H. Juang, C. W. Chang, D. C. Shye, J. L. Wang, C. C. Hwang, and S. L. Jang, “Study of polycrystalline-Si thin film transistors with different channel layer thickness at low bias voltage”, Microelectronics Engi...

It is well known that some simple electric circuits behave chaotically, such as the Chua’s circuit [Madan, 1993] hysteresis circuits [Saito, 1990], the Colpitts oscillator [Kennedy, 1994] the buck converter [Yuan et al., 1998] and so on. In these systems, there exist some switching elements, so the overall system equation can be described by piecewise-linear functions. For piecewise-linear syst...

In modern wireless communication systems, cross-coupled oscillators have been preferred over other topologies for monolithic integrated circuit implementation because they are easily realized using CMOS technology and differential circuitry. However, because the current-source transistor is top or tail located, to improve the phase noise performance, it is necessary to use the special filtering...