Patent
Digitally compensated voltage controlled oscillator
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TLDR
In this article, an apparatus consisting of a digitally controlled oscillator and a frequency tuning array is described, where the oscillator is configured to tune an output signal having a frequency in response to a digital signal.Abstract:
An apparatus comprising a digitally controlled oscillator and a frequency tuning array. The digitally controlled oscillator may be configured to finely tune an output signal having a frequency in response to a digital signal. The frequency tuning array may be configured to generate the digital signal.read more
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Patent
Digitally controlled crystal oscillator with integrated coarse and fine control
TL;DR: In this article, a coarse tuning array and a fine tuning array of capacitors fabricated on the same integrated circuit die are adjusted until the difference between a desired frequency and the output frequency corresponds to a change in capacitance no greater than half the range of the fine-tuning array.
Patent
Multi-mode crystal oscillator system selectively configurable to minimize power consumption or noise generation
TL;DR: In this article, a multi-mode crystal oscillator system (100) selectively configurable to minimize power consumption or noise generation is presented, which is particularly applicable to the communication system of an implantable device such as the microstimulator/sensor device described in U.S. Patents 6, 164, 284 and 6, 185, 452.
Patent
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TL;DR: In this article, a frequency synthesis/multiplication circuit and method for multiplying the frequency of a reference signal is presented, in which multiple versions of the reference signal are generated having different phases relative to one another, and these multiple versions are combined to form an output signal having a frequency that is a multiple of the original reference signal.
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Frequency synthesizer having a more versatile and efficient fractional-N control circuit and method
TL;DR: In this paper, a frequency synthesizer is provided having a fractional-N control circuit and method that can selectively apply any fractional ratio to a frequency divider within the feedback loop of a PLL.
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Oscillator Comprising a Startup Control Device
TL;DR: In this article, the amplitude of an oscillator signal is measured and the starting-time instant for the operational time period is chosen as the time instant when the amplitude exceeds a predetermined threshold value.
References
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Patent
Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications
David R. Welland,Caiyi Wang +1 more
TL;DR: In this paper, a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) was proposed to synthesize high frequency signals, such as wireless communication signals.
Patent
Method and apparatus for operating a PLL for synthesizing high-frequency signals for wireless communications
David R. Welland,Caiyi Wang +1 more
TL;DR: In this article, a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) was used to synthesize high frequency signals, such as wireless communication signals.
Patent
High-linearity, low-spread variable capacitance array
TL;DR: In this article, a variable capacitance array with multiple capacitance modules (508, 540 and 550) is proposed to calibrate a wide range of devices to improve the response to power fluctuations by maintaining a consistent relationship between the capacitive value (510, 542, 544, 552 and 556) and the parasitic capacitance in each capacitance module.
Patent
Crystal oscillator with frequency trim
TL;DR: A timing crystal oscillator circuit as mentioned in this paper is a type of circuit that can be tuned after production to produce a timing signal with a frequency dependent on the number of load devices activated.