Doherty amplifier with input network optimized for MMIC
US8354882B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 2009 |
| Grant date | Jan 15, 2013 |
| Priority date | — |
| Expiry date | Jul 1, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/451
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a Doherty amplifier (100), the amplifier's input is connected to a main device (102) via a first branch and to a peak device via a second branch. The first branch has a first frequency-dependent input impedance with a first real part and a first imaginary part. The second branch has a second frequency-dependent input impedance with a second real part and a second imaginary part. The first and second imaginary parts have opposite polarity. The first and 5 second imaginary parts have a same magnitude so as to compensate each other in the frequency band. The first imaginary part and the second imaginary part implement a first phase shift in the. first branch and a second phase shift in the second branch, respectively. The first and second phase shifts each have a magnitude of substantially 45 degrees substantially in the middle of the frequency band and are of opposite polarity. The phase difference of the 10 input signals to the main (102) and peak (104) devices stays largely constant over the frequency band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.