Modulation amplifier for radio transmitters
US5621351A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1995 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Jan 27, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/2178
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A modulation amplifier includes a signal converter, a summator and a plurality of high frequency stages (3.sub.1-m or 4.sub.1-n). The high frequency stages (3.sub.1-m) are driven by equiphased control signals (s.sub.1-m); the high frequency stages (4.sub.1-n) are driven by control signals (t.sub.1-n) of different phase .PHI..sub.1-n. The high frequency stages (3.sub.1-m or 4.sub.1-n) can be selected in an arbitrary manner by the control signals (s.sub.1-m or t.sub.1-n). The summator adds the high frequency output signals (x.sub.1-m or y.sub.1-n) of the high frequency stages (3.sub.1-m or 4.sub.1-n). The output signal can be conveyed, for example, to a low pass and a subsequent load. The phases (.PHI..sub.1-n) of the output signals (y.sub.1-n) of the high frequency stages (4.sub.1-n) correspond to those of the control signals (t.sub.1-m). So many high frequency stages (3.sub.1-m) are selected that there is at the output of the summator a high frequency oscillation, whose amplitude changes by steps in accordance with the low frequency signal. In addition, so many high frequency stages (4.sub.1-n) with different phases (.PHI..sub.1-n) are selected that the sum of the outputs (y.sub.1-…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.