The external signal is used as a reference frequency to estimate the frequency error of an internal frequency source.
The frequency source can be a micromechanical resonator.
The present invention is directed towards a method and devices for regulating the frequency of a frequency source (22).
When a primary power source is unavailable, an output frequency is generated from the oscillator frequency, and the reference frequency source is powered-on only during calibration cycles.
The method reduces the effects of temperature variations on an operating frequency of the temperature controlled frequency source by temperature compensating the temperature controlled frequency source.
In normal operation the frequency source (1) is frequency locked to an external frequency reference (10).
The temperature-controlled frequency source may be an Overn-Controlled crystal oscillator (DCXO) and the temperature-controlled frequency source may be a TCXO ASIC.
The present invention relates to a frequency-control unit (310) for use in controlling an external controllable reference- frequency source.
The frequency of the RF frequency source is adjusted until the power of the RF gain stage is at a minimum level.
The electronic device monitors parameters that are determined to have an effect on the frequency accuracy of the internal frequency source.
The centralized frequency source (520) generates a reference signal, having a frequency below the RF band of interest, which is transmitted to a plurality of reader nodes (530a,b,c,d).
In addition, when a change in frequency from an external frequency source is detected, the electronic device will wake-up from the low power sleep mode.
In addition, when a change in frequency from an external frequency source is detected, the electronic device will wake-up from the low power sleep mode.
In addition, when a change in frequency from an external frequency source is detected, the electronic device will wake-up from the low power sleep mode.
In addition, when a change in frequency from an external frequency source is detected, the electronic device will wake-up from the low power sleep mode.
An integrated circuit (105) comprises frequency generation circuitry (100) for controlling a frequency source (110) for an automotive radar system.
The circuit comprises a reference frequency source (VCXO,2) which controls the frequency of the Voltage Controlled Oscillator (VCO,40), and a bypassed correcting integrator (58).
The one or more frequencies or phases may be selected from a plurality of frequency sources.
In particular, the GPS-based frequency/time source includes a GPS receiver (31), a variable frequency oscillator (35), and a microprocessor (33).
A SAW resonator fabricated on the same monolithic substrate provides the frequency source for the oscillator.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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