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This paper presents a novel 8.8 GHz voltage-controlled oscillator (V CO), which employs a dual-tank structure and the impulse sensitivity function (ISF) manipulation technique. By utilizing these techniques, the behavior of both the tail and the cross-coupled transistors is optimized compared to the conventional VCO; therefore, the noise from the transistors and the low quality of tank is reduced;...
Based on the border effect and relevant theories, it is found that measurement precision depends on resolution stability which is much higher than resolution itself. With the help of this new theory and the more sensitive discrimination of the border of a fuzzy area, it is possible to greatly improve the measurement precision. Since there are a lot of complicated frequency signals in quantum frequency...
A novel phase noise measurement method is proposed based on phase group processing and phase coincidence detection. Using the regularity variation of the phase difference between frequency signals, phase group processing can be made without the normalization of the frequency signals. The phase group characteristics, such as phase group synchronization, and the regularity of phase coincidence detection...
Based on the achievement of phase coincidence detection, the processing and elimination of quantization error is possible in digital frequency measurement. Because of the limited resolution of phase detection, a fuzzy area is to be formed. The higher precision can be obtained using the border stability of fuzzy areas. The decisive factor of the actual precision is the resolution stability of the border...
This paper presents a wide-tuning frequency generation scheme based on bottom-series coupled quadrature VCO (QVCO). The low band and middle band frequency signal is generated from the QVCO while the high band signal is obtained from a gilbert mixer. The tuning-range enhancement technique allows a three band frequency generation in the range from 2.4GHz to 8.4GHz without penalizing its phase noise...
In the precise phase difference measurement, we developed the dual phase coincidence detection method combined with a common oscillator. There is a certain frequency difference between the common oscillator and the two standard frequency signals which have the same nominal frequency. Utilizing the phase coincidence detection and a suitable processing, the time interval with the phase difference information...
A wide-frequency and high-resolution frequency measurement method based on the quantized phase step law is presented in this paper. Utilizing a variation law of the phase differences, the direct different frequency phase processing, and the phase group synchronization phenomenon, combining an A/D converter and the adaptive phase shifting principle, a counter gate is established in the phase coincidences...
On the basis of the concepts like the least common multiple period, the phase quantum and the group phase comparison between two signals with different frequencies, this paper explores a novel principle for PLL. The application of this principle in the digital circuit innovation experiment of active hydrogen maser can simplify its frequency transformation circuits, reduce the noise brought in by those...
Accurate navigation orientation technique can be realized not only by the measurement of time delay in the transmission, but also by the analysis of periodicity phenomenon and phase relations between signals. This paper proposes a method of accurate navigation orientation technique which is based on dual-frequency signals group phase difference disposal technique by analyzing the carrier wave phase...
Conventional phase processing is only for the continuous phase comparison at the same nominal frequency. In this case the processing resolution is limited, PLL and synthesizer are complicated, and linking between ultra high and ultra low frequency signals is very difficult. In most cases the comparison and control of frequency signals occur between the different nominal frequencies. To two signals...
Equivalent phase comparison frequency (EPCF) is an important parameter between two frequency signals, and it shows their phase correlation. It is much higher than anyone of the two frequencies, and its period is equal to the group phase shift corresponding two most adjacent phase coincidences between the signals. For example, to two frequency signals with several MHz frequency, their EPCF can be several...
Phase difference measurement techniques can be used widely in positioning and length measurement, and high resolution is necessary especially for some science research purposes. In this situation the request to the measuring device is different from that to the frequency standard comparison. It is difficult to improve the resolution of conventional counting measurement method with some high-resolution...
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