Transmitter having a phase control loop whose frequency bandwidth is varied in accordance with modulation modes
US7085544B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 26, 2003 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Jan 8, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/0433
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted from a power amplification circuit, and designed to be capable of performing transmission using a GMSK modulation mode and transmission using an 8-PSK modulation mode. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode. A component similar to any one of components constituting a loop filter is provided in parallel therewith so that the component can be connected or disconnected in accordance with the modulation mode, for example, by use of a switching element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.