MOBIUS MICROSYSTEMS, INC. Patent applications |
Patent application number | Title | Published |
20100019856 | Monolithic Clock Generator and Timing/Frequency Reference - In various embodiments, the invention provides a clock generator and/or a timing and frequency reference, with multiple operating modes, such power conservation, clock, reference, and pulsed modes. The various apparatus embodiments include a resonator adapted to provide a first signal having a resonant frequency; an amplifier; a temperature compensator adapted to modify the resonant frequency in response to temperature; and a process variation compensator adapted to modify the resonant frequency in response to fabrication process variation. In addition, the various embodiments may also include a frequency divider adapted to divide the first signal having the resonant frequency into a plurality of second signals having a corresponding plurality of frequencies substantially equal to or lower than the resonant frequency; and a frequency selector adapted to provide an output signal from the plurality of second signals. The output signal may be provided in any of various forms, such as differential or single-ended, and substantially square-wave or sinusoidal. | 01-28-2010 |
20090167451 | Frequency Controller for a Monolithic Clock Generator and Timing/Frequency Reference - In various embodiments, the invention provides a frequency controller to control and provide a stable resonant frequency of a clock generator and/or a timing and frequency reference. Such stability is provided over variations in a selected parameter such as temperature and fabrication process variations. The various apparatus embodiments include a sensor adapted to provide a signal in response to at least one parameter of a plurality of parameters; and a frequency controller adapted to modify the resonant frequency in response to the second signal. In exemplary embodiments, the sensor is implemented as a current source responsive to temperature fluctuations, and the frequency controller is implemented as a plurality of controlled reactance modules which are selectively couplable to the resonator or to one or more control voltages. The controlled reactance modules may include fixed or variable capacitances or inductances, and may be binary weighted. Arrays of resistive modules are also provided, to generate one or more control voltages. | 07-02-2009 |
20090167444 | Inductor and Capacitor-Based Clock Generator and Timing/Frequency Reference - In various embodiments, the invention provides a clock generator and/or a timing and frequency reference comprising an LC oscillator with a frequency controller to control and provide a stable resonant frequency. Such stability is provided over variations in a selected parameter such as temperature and fabrication process variations. The various apparatus embodiments include a sensor to provide a signal in response to at least one parameter of a plurality of parameters; and a frequency controller to modify the resonant frequency in response to the second signal. In exemplary embodiments, the sensor is implemented as a current source responsive to temperature fluctuations, and the frequency controller is implemented as a plurality of controlled reactance modules which are selectively couplable to the oscillator or to one or more control voltages. The controlled reactance modules may include fixed or variable capacitances or inductances, and may be binary weighted. Arrays of resistive modules are also provided, to generate one or more control voltages. | 07-02-2009 |
20090146752 | Clock, Frequency Reference, and Other Reference Signal Generator with a Controlled Quality Factor - Exemplary embodiments of the invention provide a reference signal generator having a controlled quality (“Q”) factor. An exemplary apparatus to generate a harmonic reference signal includes a reference resonator, such as an LC-tank, which generates a first reference signal having a resonant frequency, and a plurality of reactance modules couplable to the reference resonator. Each reactance module comprises one or more reactance unit cells, and each reactance unit cell comprises a reactance element coupled in series to a switching element. In exemplary embodiments, the reactance element is a capacitor having a predetermined unit of capacitance, and the switching element is a transistor having a predetermined resistance when in an off state. The ratio of capacitance to resistance is substantially constant for all reactance modules of the plurality of reactance modules. | 06-11-2009 |
20090146751 | Clock, Frequency Reference, and Other Reference Signal Generator - Exemplary embodiments of the invention provide a reference signal generator, system and method. An exemplary apparatus to generate a harmonic reference signal includes a reference resonator, such as an LC-tank, and a frequency controller. The reference resonator generates a first reference signal having a resonant frequency, and the frequency controller maintains substantially constant a magnitude of a peak amplitude of the first reference signal and maintains substantially constant a common mode voltage level of the reference resonator. A temperature-dependent control voltage is also generated and utilized to maintain the resonant frequency substantially constant or within a predetermined variance of a calibrated or selected frequency. | 06-11-2009 |
20090146750 | Common Mode Controller for a Clock, Frequency Reference, and Other Reference Signal Generator - Exemplary embodiments of the invention provide a reference signal generator, system and method. An exemplary apparatus to generate a harmonic reference signal includes a reference resonator, such as an LC-tank, and a common mode controller. The reference resonator generates a first reference signal having a resonant frequency, and the common mode controller maintains substantially constant a common mode voltage level of the reference resonator. An amplitude controller may also be included to maintain substantially constant a magnitude of a peak amplitude of the first reference signal. A temperature-dependent control voltage also may be generated and utilized to maintain the resonant frequency substantially constant or within a predetermined variance of a calibrated or selected frequency. | 06-11-2009 |
20090146748 | Amplitude Controller for a Clock, Frequency Reference, and Other Reference Signal Generator - Exemplary embodiments of the invention provide a reference signal generator, system and method. An exemplary apparatus to generate a harmonic reference signal includes a reference resonator, such as an LC-tank, and an amplitude controller. The reference resonator generates a first reference signal having a resonant frequency, and the amplitude controller maintains substantially constant a magnitude of a peak amplitude of the first reference signal. A common mode controller may also be included to maintain substantially constant a common mode voltage level of the reference resonator. A temperature-dependent control voltage also may be generated and utilized to maintain the resonant frequency substantially constant or within a predetermined variance of a calibrated or selected frequency. | 06-11-2009 |
20090146719 | Control Voltage Generator for a Clock, Frequency Reference, and Other Reference Signal Generator - Exemplary embodiments of the invention provide a reference signal generator, system and method. An exemplary apparatus to generate a harmonic reference signal includes a reference resonator, such as an LC-tank, a control voltage generator adapted to provide a temperature-dependent control voltage; and a plurality of variable reactance modules. The reference resonator generates a first reference signal having a resonant frequency, and each reactance module is adapted to modify a corresponding reactance in response to the control voltage to maintain the resonant frequency substantially constant or within a predetermined variance over a predetermined temperature range. A frequency controller may also be included to maintain substantially constant a magnitude of a peak amplitude of the first reference signal and maintains substantially constant a common mode voltage level of the reference resonator. | 06-11-2009 |