Harmonic filtering for high power radio frequency (RF) communications
US11349448B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2019 |
| Grant date | May 31, 2022 |
| Priority date | — |
| Expiry date | Feb 26, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/0408
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Systems and methods are disclosed for on-chip harmonic filtering for radio frequency (RF) communications. For disclosed embodiments, a filter circuit is coupled between a first internal node and a connection pad for an integrated circuit. The filter circuit includes a first inductance, a variable capacitance, and a second inductance. The capacitance amount for the variable capacitance is controlled to tune filtering for the filter circuit to a harmonic of a frequency for a transmit output signal. A power amplifier outputs the transmit output signal to the connection pad without passing through the filter circuit. The filter circuit filters the harmonic of the frequency for the transmit output signal, shunting harmonic current to ground. For one embodiment, the filtered harmonic is a third harmonic of the transmit frequency. For one embodiment, the transmit output signal has an output power greater than or equal to 15 dBm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.