Topic
Relaxation oscillator
About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.
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TL;DR: The proposed linearized MOSFET model allows the accurate prediction of the operating frequency while the phase noise evaluation technique makes it possible to determine, through simulation, the relative phase-noise performance of different oscillator architectures.
Abstract: CMOS inductorless voltage controlled oscillator (VCO) design is discussed with the emphasis on low-noise, low-power, gigahertz-range circuits suitable for portable wireless equipment. The paper considers three VCO structures-one simple ring oscillator and two differential circuits. The design methodology followed optimization for high-speed and low-power consumption. The proposed linearized MOSFET model allows the accurate prediction of the operating frequency while the phase noise evaluation technique makes it possible to determine, through simulation, the relative phase-noise performance of different oscillator architectures. The measurement results of three VCO's implemented in 1.2-/spl mu/m CMOS technology confirm with the simulation predictions. The prototype VCO's exhibits 926-MHz operation with -83 dBc/Hz phase noise (@ 100 kHz carrier offset) and 5 mW (5 V) power consumption.
75 citations
Patent•
30 Jan 2002
TL;DR: In this paper, a capacitive sensor system for controlling operation of a device in response to a rate of change in capacitance due to motion of a proximate object is described.
Abstract: A capacitive sensor system for controlling operation of a device in response to a rate of change in capacitance due to motion of a proximate object includes at least two sense electrodes (14,16) disposed on a surface and a phase locked loop (12), including a voltage controlled oscillator (22) and a phase/frequency comparator (24), connected between the sense electrodes and an RC network (20) for providing an operating frequency to the sense electrodes. A circuit loop, including a reference oscillator (32), provides a fixed frequency references for the phase locked loop to follow and a phase delay circuit (34) connected between the phase/frequency comparator and the voltage controlled oscillator causes the voltage controlled oscillation to run ahead of the reference oscillator. A trigger circuit (30) provides a control output in response to a change in phase shift between the fixed frequency and the operating frequency.
73 citations
Patent•
05 Feb 1997
TL;DR: In this article, a method and system for calibrating a batch of devices each containing a circuit which is responsive to a control signal for producing a desired output which varies in accordance with a first predetermined function of a specific ambient condition, the second function being based on data stored as a look-up table in a memory of the device and which must be individually calibrated for each device.
Abstract: A method and system are provided for calibrating a batch of devices each containing a circuit which is responsive to a control signal for producing a desired output which varies in accordance with a first predetermined function of a specific ambient condition, the control signal having a magnitude which varies as a second predetermined function of the specific ambient condition, the second function being based on data stored as a look-up table in a memory of the device and which must be individually calibrated for each device. In a preferred embodiment, the device is a digital temperature controlled crystal oscillator which produces a desired output frequency and includes a voltage controlled oscillator (VCO) responsive to a control signal having a magnitude which varies as a predetermined function of ambient temperature in order to compensate for temperature variations in the oscillator output frequency. For such an application, the invention requires the connection of an accurate frequency source to each oscillator in the batch so as to enable the output frequency of the oscillator to be equalized thereto or to a multiple thereof. In calibration mode, the digital equivalent of the resulting analog control voltage is stored; whilst in compensation mode it is extracted from the memory, converted to an equivalent analog voltage and applied to the VCO. The invention is also applicable to compensate for aging of crystal oscillators in the field without requiring reconfiguring the complete look-up table.
73 citations
TL;DR: In this article, with analog simulators, the dynamics of a system consisting of a van der Pol oscillator coupled to a Duffing oscillator are analyzed. And the jump or hysteresis phenomenon is found.
Abstract: This paper studies, with analog simulators, the dynamics of a system consisting of a van der Pol oscillator coupled to a Duffing oscillator. Amplitude-response curves are obtained in the case of internal resonance. The jump or hysteresis phenomenon is found. Various bifurcations are observed, and it is found that chaos can appear suddenly, through period-adding or through torus breakdown. The experimental results are compared with the numerical solutions.
71 citations
13 Jun 2012
TL;DR: A self-chopped relaxation oscillator with adaptive supply generation provides the stable output clock against variations in temperature and supply voltages and is implemented in a 60-nm CMOS technology.
Abstract: A self-chopped relaxation oscillator with adaptive supply generation provides the stable output clock against variations in temperature and supply voltages. The frequency drift is less than ±0.1% for the supply voltage changing from 1.6 to 3.2 V and ±0.1% for a temperature range from −20 to 100°C, which is reduced by 83% with the self-chopped technique. This relaxation oscillator is implemented in a 60-nm CMOS technology with its active area equals to 0.048 mm2. It consumes 2.8 uA from a 1.6-V supply.
71 citations