Loss compensation in radio-frequency filters
US12020858B2 · kind B2 · utility
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8References
14Claims
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Key dates
| Filing date | Jun 24, 2021 |
| Grant date | Jun 25, 2024 |
| Priority date | — |
| Expiry date | Nov 6, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2201/1003
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A Q-enhanced radio-frequency filter featuring loss-compensating circuits with values that can be controlled to optimize loss compensation. Instabilities are avoided by temporarily introducing a reflection at a port (such as via short-circuiting the port) and testing for the beginning of oscillations. Certain embodiments provide negative-resistance circuits for loss compensation, including cross-coupled transistor pairs and adjustable capacitance. Further embodiments provide loss-compensating RF filters with planar inductors, including overlapping planar inductors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.