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This paper presents a CMOS 1.8 V–0.18 μm quadrature sinusoidal oscillator designed for its application as the actuation system in portable frequency-domain sensing devices, such as impedance spectroscopy or resonant readout systems. It is based on an analog implementation, to preserve low-voltage low-power operation with a compact topology. The oscillation frequency can be digitally set by a novel...
In this paper, a digitally-controlled oscillator (DCO) with differential output and eight different phases is proposed. The DCO is based on two-path ring oscillator (RO) with cross-coupled structure. The proposed DCO structure consists of four differential stages and two 9-bit digitally-controlled current sources, which guarantee high resolution and monotonic behavior of the DCO. The circuit is simulated...
This paper presents a 0.8V analog front-end (AFE) with referenceless time-based digitalization architecture for electrocardiogram (ECG) signal acquisition. Compared to the conventional voltage-domain architecture, the proposed AFE achieves a smaller chip area, lower power consumption, and self-calibration without the high-accuracy clock as well as voltage reference. The chip is fabricated using 0...
Miniaturized computing platforms typically operate under restricted battery capacity due to their size [1]. Due to low duty cycles in many sensing applications, sleep-mode power can dominate the total energy budget. Wakeup timers are a key always-on component in such sleep modes and must therefore be designed with aggressive power consumption targets (e.g., <10nW). Also, accurate timing generation...
A voltage controlled MEMS oscillator (VCMO) fabricated in 65nm CMOS process is proposed in this paper. The piezoelectric aluminum nitride (AlN) Contour-Mode MEMS resonator based oscillator can be operated under multiple frequencies from 204MHz, to 517MHz, to 850MHz. A maximum overall tuning range of 611ppm is achieved at a center frequency of 204MHz. The proposed oscillator operates in the sub-threshold...
A low-power oscillator based on a pulsed LC tank is presented in this article. The frequency is determined by a bondwire inductor and a MiM capacitor to obtain a high-Q LC tank. Due to a novel way of driving the LC tank, the power consumption is diminished. Since the driving technique only interacts during a very short period with the LC tank, the frequency mainly depends on the stable LC tank and...
This paper describes the modeling and design considerations of a low-power divide-by-two injection-locked frequency divider (ILFD) for 60GHz frequency synthesizer applications implemented in 90nm CMOS process. The paper proposes a divider's locking range model based on mixing analysis. The design uses a capacitor bank for the divider band selection and tail current injection. Measured results of the...
This article presents a current-mode quadrature oscillator using current controlled current feedback amplifiers (CC-CFAs) as active elements. The proposed circuit is realized from a lossy integrator and a lossy differentiator. The oscillation condition and oscillation frequency can be orthogonally controlled via input bias currents. The circuit description is very simple, consisting of merely 2 CC-CFAs,...
A delay-locked loop of multi-band selector with wide-locking range and low power dissipation is presented. The architecture of the proposed delay-locked loop consists of phase frequency detector, charge pump, band selector, multi-control delay line, and start-up circuit. The multi-band selector is used to extend operation frequency of delay-locked loop by switching the multi-control delay line. The...
A novel compact coupled planar resonator (CCPR) based VCO (voltage controlled oscillator) using mode-coupling technique was developed in response to expensive high Ceramic and SAW resonators based signal source for wireless communications. One of the problems related to the conventional Ceramic/SAW based resonators (with high Q and low phase noise) is the challenge for integration in IC form. Instead...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
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