Mobile communication apparatus and method
US5574993A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 19, 1994 |
| Grant date | Nov 12, 1996 |
| Priority date | — |
| Expiry date | Sep 19, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3042
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A mobile communication apparatus is provided, in which the linearity during a small output power of a radio-frequency power amplifier can be maintained as during a large output power. The input signal power to a radio-frequency power amplifier is decreased by an attenuator during a small power output. The resulting downward trend of the transmission signal power is compensated for by increasing the gain of the radio-frequency amplifier circuit through a transmission power control circuit. Under this condition, the radio-frequency power amplifier is made operable in a linear region of the transistor in the same manner as during a large power output. As a result, the linearity of the amplifier is guaranteed over the whole operating range of the transmission power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.