Multiple-push oscillator

Details Multiple-push oscillator Multiple-push oscillator

2000-09-07

2001-10-30

Mis, David (Department: 2817)

Oscillators

Plural oscillators

Parallel connected

C331S046000, C331S1170FE, C331S172000

Reexamination Certificate

active

06310522

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an improved high-frequency oscillator and, more particularly, to a multiple-push oscillator combining at least three fundamental oscillators to provide a high-frequency signal.
BACKGROUND OF THE INVENTION
In a millimeter-wave wireless communication system, the high-frequency signal source is a very important component. For instance, radar and communication systems require oscillators to provide high-frequency signals.
In prior art, the method of designing high-frequency oscillators is to use fundamental oscillators. However, when used in designing a high-frequency signal source, this method has the drawbacks of low transistor gain and low resonator quality factor (Q factor). Therefore, fundamental oscillators must be matched with frequency multipliers to provide a high-frequency signal. The oscillator of this configuration is designed to resonate at lower frequency of the output signal. Therefore, higher transistor gain and larger resonator Q factor can be obtained. However, amplifiers and filters usually are needed for oscillators of this configuration, hence resulting in large circuit area.
To overcome the drawbacks but maintain the original advantages of the fundamental oscillators, a push-push oscillator configuration has been proposed. The push-push oscillator combines two fundamental oscillators so that when the fundamentals are out of phase, the second harmonics will be in phase. Therefore, the in-phase second harmonics will combine at the output terminal, while the anti-phase fundamentals will cancel out each other. Using this configuration, the drawbacks of insufficient gain and low resonator Q factor of fundamental oscillators in high frequency range and the drawback of too large circuit area of fundamental oscillators combined with frequency multipliers can be resolved simultaneously.
The present invention aims to provide a multiple-push oscillator, which can resolve the drawbacks of insufficient gain and low resonator Q factor more easily than a fundamental oscillator or a push-push oscillator does.
SUMMARY AND OBJECTS OF THE PRESENT INVENTION
The primary object of the present invention is to provide a multiple-push oscillator, which uses phase differences to suppress fundamentals and second harmonics thereof so that the output of third harmonics can be increased.
Another object of the present invention is to provide a multiple-push oscillator having the advantages of high transistor gain, high resonator Q factor, and low phase noise.
According to the present invention, a triple-push oscillator combines three fundamental oscillators. Through the design of circuit connection, the three fundamental oscillators will operate at odd modes with phase differences of 120 degrees among their output currents. Thereby, an output of third harmonics interfering constructively can be obtained, while the fundamentals and the second harmonics are suppressed for the combined triple-push oscillator, hence raising the frequency of the output signal to be three times as large as that of the fundamentals.


REFERENCES:
patent: 5373260 (1994-12-01), Kato

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