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A novel dualband impedance transformer based on fractional-order inductor and capacitor is proposed in this paper. This transformer is designed to transfer the arbitrary frequency-dependent complex impedances sources to loads at two irrelevant frequencies with one fractional-order inductor and two fractional-order capacitors. Each fractional-order element has two parameters to be determined: the order...
This paper presents an improved and generalized theoretical postulations of fractional order circuit elements based impedance matching networks. For the first time, fractional elements for multi frequency impedance matching has been explored and it has been identified that the fractional elements possess tremendous potential for such applications. The presented theory has been verified in a custom...
A reconfigurable dual-band radio frequency power amplifier topology (PA) is proposed in this work. The supply bias inductor is shared between two PAs that are designed to operate in two different frequency bands. The primary advantage is significant reduction in silicon area, without compromising on RF performance and power efficiency. To validate the proposed technique, a PA for the LTE cellular...
This paper presents a low power reconfigurable narrowband, concurrent multiband, wideband multimode LNA for multi-standard applications. Subthreshold region biasing, quality factor aware impedance matching, component sharing between different modes are employed. Input matching is unbounded from other performance parameter. Proposed LNA works in narrowband mode at 1.8GHz, 2.1GHz and 2.4GHz, dualband...
A frequency reconfigurable dualband antenna is demonstrated, where the antenna's conductor consists of a radiating conductor, lumped and distributed elements, and varactors. An analytical expression for current distribution, input impedance, and radiated power is derived by connecting electromagnetic fields inside and outside the antenna's sphere for an electrically small antenna. With the formulae,...
This paper presents two different switchless (concurrent) dual-band load networks for class E power amplifier at 800 MHz and 1.9 GHz for 4G LTE standards. The two presented load structures, the all-lumped element and the transformer-based structure not only provide optimal impedance at both fundamental frequencies but also present high impedance up to their 3rd harmonics. Simulated PAEs for the all-lumped...
<?Pub Dtl?>This paper presents a harmonic termination technique for single- and multi-band high-efficiency class-F monolithic microwave integrated circuit (MMIC) power amplifiers (PAs). The harmonic termination network (HTN), realized with the minimum possible number of elements, can be used to terminate an arbitrary number of harmonics in a single-band PA or harmonics of multiple frequencies...
To adapt to the rapid development of multi-standard mobile communication, a low noise amplifier (LNA) that can operate at two frequencies of 800MHz and 1.8GHz respectively was designed. SiGe HBTs with good noise performance were used in the design. The Cascode circuit topology was adopted to reduce the Miller effect of the transistor. Inductor degeneration in emitter was introduced to decouple the...
This article presents the design of a fully concurrent dual-band Low Noise Amplifier (LNA) operating in the GSM 0.9GHz & BLUETOOTH 2.4GHz communication standards. The fully concurrent LNA is designed and simulated in CADENCE using 130nm UMC technology. The dual-band LNA has been designed from the system viewpoint to provide a higher gain at the high band in order to compensate the high-band...
In this work, a dual-band current-reused LNA is designed with dual-band matching networks at input and output. The switched inductors are also used in the inter-stage to reject the unwanted signals from other frequencies. The configuration of current-reused has the advantages of cascode one, such as high isolation, reduced Miller effect, and low noise, and it could also decrease the power consumption...
This paper describes a dual-bands low noise amplifier design for WCDMA and WiMAX applications. The low-noise amplifier (LNA) is implemented with the proposed dual-band matching network that consists of a high-pass and low-pass ladder. The LNA is fabricated in 0.5 um enhancement- mode pHEMT (E-mode pHEMT) technology for high linearity and low noise application. The measured noise figures (NF) and insertion...
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