| US 7,518,441 B2 | ||
| Signal processor for use with a power amplifier in a wireless circuit | ||
| Tayfun Nesimoglu, Bristol (United Kingdom); and Kevin A Morris, Bristol (United Kingdom) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Sep. 25, 2006, as Appl. No. 11/534,860. | ||
| Claims priority of application No. 0524426.4 (GB), filed on Nov. 30, 2005. | ||
| Prior Publication US 2007/0123184 A1, May 31, 2007 | ||
| Int. Cl. H03F 3/38 (2006.01) | ||
| U.S. Cl. 330—10 [330/136] | 16 Claims |
| 1. A signal processor for use in a wireless transmitter, for generating a radio frequency signal suitable for transmission, either with or without further power amplification, the signal processor comprising signal separating means for separating an input signal into first and second processing paths, the first processing path comprising signal envelope processing means for generating a pulse train signal being a digitized envelope signal, and the second processing path comprising phase processing means operable to generate a constant envelope phase signal, and further comprising an RF switch operable to switch said phase signal by means of said pulse train signal, and further comprising a digital signal processor implementing said envelope processing means, said phase processing means and said RF switch. |