Loss cancelling resonator and filters
阅读：454发布：2022-11-22
专利汇可以提供Loss cancelling resonator and filters专利检索，专利查询，专利分析的服务。并且A loss cancelling resonator is disclosed which comprises a passive LC circuit coupled to a transistor in the invertedcommon-collector configuration. Typical notch filter configurations are also disclosed including notch filters with more than one resonator. Switchable notch filters are disclosed as well as a frequency synthesizer which utilizes a plurality of switchable notch filters.，下面是Loss cancelling resonator and filters专利的具体信息内容。
1. An active inductive loss cancelling filter element having first and second terminals and including first and second inductances, and a transistor having base emitter and collector electrodes, base circuit means for connecting said base electrode to said first terminal, collector circuit means for connecting said collector to said first terminal, emitter circuit means for connecting said emitter through said first inductance to said second terminal, said second inductance connected between said emitter electrode and said collector electrode.
2. The active inductive filter element of claim 1 wherein said base circuit means for connecting said base electrode to said first terminal includes a third inductance.
3. The active inductive filter element of claim 1 including dc power source means coupled to said emitter electrode and said collector electrode for biasing said transistor.
4. The active inductive filter element of claim 3 wherein said dc power source means includes switch means for disconnecting dc power from said base electrode and said collector electrodes whereby bias is removed from said transistor.
5. An active notch filter for operation at high frequencies including a transmission line, a reference potential terminal, and a resonator, said resonator connected between said transmission line and said reference potential terminal and including a capacitance and an active inductive filter element, said active inductive filter element having first and second terminals and including a first inductance, a second inductance, and a transistor having base emitter and collector electrodes, base circuit means connecting said base electrode to said first terminal, collector circuit means connecting said collector electrode to said first terminal, emitter circuit means connecting said emitter electrode through said first inductance to said second terminal, and said second inductance connected between said emitter electrode and said collector electrode.
6. The active notch filter of claim 5 wherein said base circuit means connecting said base electrode to said first terminal includes a third inductance.
7. The active notch filter of claim 5 wherein said capacitance is adjustable for varying the notch frequency.
8. The active notch filter of claim 5 including dc power source means coupled to said emitter electrode and said base electrode for biasing said transistor.
9. The active notch filter of claiM 8 wherein said dc power supply means is adjustable to vary the bias on said transistor.
10. The active notch filter of claim 8 wherein said dc power supply means includes switch means for removing the bias from said transistor.
11. A filter network for operation at high frequencies including a transmission line, band-pass filter means including a capacitance and an inductance disposed along said transmission line, an active notch resonator, means for coupling said active notch resonator to said bandpass filter means whereby characteristics of said active notch resonator are superimposed on characteristics of said passive bandpass filter means, and wherein said active notch resonator comprises a capacitance and an active inductive filter element having first and second terminals and including a first inductance, a second inductance and a transistor having base emitter and collector electrodes, base circuit means connecting said base electrode to said first terminal, collector circuit means connecting said collector electrode to said first terminal, emitter circuit means connecting said emitter electrode through said first inductance to said second terminal, and said second inductance connected between said emitter electrode and said collector electrode.
12. The filter network of claim 11 wherein said inductance in said bandpass filter means comprises active inductive elements.
13. The filter network of claim 11 wherein said bandpass filter means is a low pass filter.
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