Oscillators – Solid state active element oscillator – Significant distributed parameter resonator
Patent
1995-11-03
1997-03-04
Mis, David
Oscillators
Solid state active element oscillator
Significant distributed parameter resonator
331108B, 331135, H03B 500, H03B 530
Patent
active
056083602
ABSTRACT:
Multiple resonator stages are connected in series to form a closed loop. Each of these cascaded resonator stages includes at least a high frequency resonator and an amplifier. The amplifier amplifies the output of the high frequency resonator. Each stage also includes a power divider connected to the amplifier output. The power divider has at least two outputs. One of the two power divider outputs serves as an output of the oscillator formed by the cascaded resonator stages. The other output of the power divider is connected to the input of the next high frequency resonator stage. The oscillator further includes a phase shifter connected between two of the high frequency resonator stages to achieve a closed loop phase shift of N(360) degrees at the oscillator operating frequency, where N is an integer. The high frequency resonators may be acoustic resonators such as surface acoustic wave resonators (SAWR). In this manner, the method and oscillator generate at least one high frequency oscillator signal having previously unattainable phase noise characteristics.
REFERENCES:
patent: 4590442 (1986-05-01), Saito et al.
patent: 4851790 (1989-07-01), Driscoll
patent: 5250871 (1993-10-01), Driscoll et al.
Florenzo Philip A.
Mis David
Northrop Grumman Corporation
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