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公开(公告)号：US11005424B2
公开(公告)日：2021-05-11
申请号：US16453152
申请日：2019-06-26
Inventor： Kathiravan Krishnamurthi , Souleymane Gnanou , Douglas S. Jansen
Abstract: A power efficient (PE) amplifier includes a cascode amplifier, a transistor amplifier, and a voltage supply. The transistor amplifier includes at least one differential pair of transistors and a plurality of transformers having a primary winding and a tapped secondary winding. The secondary winding is connected across emitters or sources of each transistor pair. The tap of each secondary has a current source. The primary windings of the plurality of transformers are connected in series. The transistor bases or gates are alternating current (AC) grounded. The collector or drain terminal pairs are connected in parallel. The voltage supply is low voltage and supplies a current to the cascode amplifier. The PE amplifier further includes a plurality of current sources which provide a total current to the transistor amplifier. The PE amplifier has, among other things, improved power gain, improved reverse isolation, improved power dissipation, and improved peak differential swing.
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公开(公告)号：US10367243B2
公开(公告)日：2019-07-30
申请号：US15584191
申请日：2017-05-02
Inventor： Souleymane Gnanou , James M. Huggett
Abstract: Low temperature co-fired ceramic (LTCC)-coupled stripline resonator filters for use as bandpass filters are implemented with combline topology or with interdigital topology. The filter bandwidths range from about 0.3 GHz to less than 1 GHz with frequency operation of about 0.1 GHz to 100 GHz. The filters have vias between adjacent resonators with via spacing significantly smaller than the wavelength at the filter center frequency to generate electrical walls between adjacent resonators resulting in coupling reduction for narrowband filter implementation. A narrowband filter transformer loading structure launches the input and the output to the first and last resonators.
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