| 摘要 |
A radio paging receiver having a primary power source, and outputs boosted by DC-DC converters as its secondary power sources. The radio paging receiver is provided with a first DC-DC converter which operates all the time or while the power source is on and a second DC-DC converter which operates intermittently to be active only when the load current is greater. The first DC-DC converter is so set as to be higher in source efficiency under light load and the second, as to normally operate even under heavy load. The first DC-DC converter supplies power to the circuits including a decoder in all the modes including the standby mode and the battery saving mode, both imposing only a light load. The second DC-DC converter intermittently operates to be active only in the heavy-load message data processing and message display modes, and supplies power to a CPU and an LCD signal processor in these modes. The voltages of the first and second DC-DC converters may be different from each other and, if they are, the output of the first DC-DC converter is supplied only to less loaded circuits.
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