Re-configurable ring resonator for oscillator application
13 Jul 2015-pp 548-551
TL;DR: The proposed RRR can be used for low phase noise oscillator design and change in resonant frequency is observed in diode on and diode off condition.
Abstract: This paper presents, design and simulation of a re-configurable ring resonator (RRR). The resonance frequency of the resonator can be re-configure by changing the biasing of diode. Change in resonant frequency is observed in diode on and diode off condition. This resonator can be re-configure from 3.17 GHz to 6.62 GHz in diode on and off condition. The proposed RRR can be used for low phase noise oscillator design.
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Abstract: A brief history of microwave engineering is given. The impact of computer-aided design and monolithic microwave integrated circuits on microwave design is examined. The career potential of microwave engineering is discussed, along with suggestions for related studies that would be useful to the microwave engineer. >
3,169 citations
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...Resonance occurs when the average stored magnetic and electrical energies are equal [5]....
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TL;DR: A low-phase-noise wide-tuning-range oscillator suitable for scaled CMOS processes that switches between the two resonant modes of a high-order LC resonator that consists of two identical LC tanks coupled by capacitor and transformer.
Abstract: In this paper we will present a low-phase-noise wide-tuning-range oscillator suitable for scaled CMOS processes. It switches between the two resonant modes of a high-order LC resonator that consists of two identical LC tanks coupled by capacitor and transformer. The mode switching method does not add lossy switches to the resonator and thus doubles frequency tuning range without degrading phase noise performance. Moreover, the coupled resonator leads to 3 dB lower phase noise than a single LC tank, which provides a way of achieving low phase noise in scaled CMOS process. Finally, the novel way of using inductive and capacitive coupling jointly decouples frequency separation and tank impedances of the two resonant modes, and makes it possible to achieve balanced performance. The proposed structure is verified by a prototype in a low power 65 nm CMOS process, which covers all cellular bands with a continuous tuning range of 2.5-5.6 GHz and meets all stringent phase noise specifications of cellular standards. It uses a 0.6 V power supply and achieves excellent phase noise figure-of-merit (FoM) of 192.5 dB at 3.7 GHz and >; 188 dB across the entire tuning range. This demonstrates the possibility of achieving low phase noise and wide tuning range at the same time in scaled CMOS processes.
165 citations
TL;DR: In this article, a new class of evanescent tunable combline bandpass filters based on electronic tuning with the use of RF microelectromechanical systems (RF-MEMS) capacitor banks and also mechanical tuning using piezomotors is presented.
Abstract: This paper presents the design and implementation of a new class of evanescent tunable combline bandpass filters based on electronic tuning with the use of RF microelectromechanical systems (RF-MEMS) capacitor banks and also mechanical tuning using piezomotors The use of microelectromechanical systems tuning circuit results in compact implementation of the proposed filters with high-Q and near to zero dc power consumption The proposed filter structures consist of combline resonators with tuning disks that are either mechanically moveable using piezomotors or are loaded with RF-MEMS capacitor banks Two- and six-pole tunable bandpass filters are designed and measured based on the proposed tuning concept The two-pole tunable filter operates at 25 GHz with a bandwidth of 22 MHz and demonstrates a tuning range of 110 MHz, while the quality factor is better than 374 (1300-374 over the tuning range) The six-pole tunable filter with RF-MEMS capacitor banks operates from 2634 to 259 GHz (44-MHz tuning range) The proposed tunable filter structures can also be implemented using alternative technologies such as barium-strontium-titanate varactors
91 citations
01 Oct 2008
TL;DR: In this paper, a switchable bandstop filter is presented to switch between two different central frequency states while precisely maintaining a fixed bandwidth, which is achieved by choosing adequate resonator sections which are switched by PIN diodes.
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32 citations