Circuit and method for impedance matching
US6414562B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1997 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | May 27, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/0458
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An impedance matching circuit (10) matches the impedance of a load (19) coupled to an RF amplifier (12) to that of the RF amplifier (12). The impedance matching circuit (10) samples a transmitted signal from the RF amplifier (12) and a reflected signal from the load (19). The amplitude and the phase of the sampled reflected signal are compared with those of the sampled transmitted signal to calculate the impedance mismatch. A control logic circuit (80) adjusts the capacitance and inductance values of variable capacitance (23; 27) and inductance (35) elements in the impedance matching circuit (10), thereby matching the impedance of the load (19) to that of the RF amplifier (12).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.