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Low phase noise, wide tuning range oscillator utilizing a one port SAW resonator and method of operation
Low phase noise, wide tuning range oscillator utilizing a one port SAW resonator and method of operation
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机译:利用一个端口SAW谐振器的低相位噪声,宽调谐范围的振荡器及其工作方法
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摘要
There is disclosed a SAW resonator-based oscillator circuit having low phase noise that is tunable across a comparatively wide frequency range. The oscillator circuit comprises: 1) a tuning element coupled to the input port and having a variable capacitance responsive to the frequency tuning signal; 2) a first inductor coupled in series with the tuning element; 3) a SAW resonator coupled in series with first inductor; 4) a second inductor coupled in parallel with the SAW resonator; 5) a negative resistance generating circuit coupled to the SAW resonator. Across the tunable operating frequency range of the oscillator circuit, the reactance looking into the input port is maintained at approximately zero and the resistance looking into the input port remains negative.
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