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US 2002/0055376 A1Published application
Power amplifier
AssigneeNEC Corporation
InventorHidehiko Norimatsu
Life of this patent
Estimating the term…
Abstract
In a power-amplifier for amplifying power using a transistor, the transistor includes a plurality of transistor units connected in parallel and having different static characteristics or pinch-off voltages. When a bias voltage applied to the plurality of transistor units is lowered, predetermined transistor units of the plurality of transistor units are turned off by pinch-off, and the remaining transistor units are in an ON state.
Claims21
A power amplifier for amplifying power using a transistor,
- wherein said transistor comprises a plurality of transistor units connected in parallel and having different static characteristics.
A power amplifier for amplifying power using a transistor,
- wherein said transistor comprises a plurality of transistor units connected in parallel and having different pinch-off voltages, and when a bias voltage applied to said plurality of transistor units is lowered, predetermined transistor units of said plurality of transistor units are turned off by pinch-off, and the remaining transistor units are in an ON state.
A power amplifier for amplifying power using a transistor,
- wherein said transistor comprises- a plurality of transistor units connected in parallel and having different pinch-off voltages, each of said plurality of transistor units comprises a transistor group having a plurality of transistors, when a bias voltage applied to said plurality of transistor units is lowered, predetermined transistor units of said plurality of transistor units are turned off by pinch-off, and the remaining transistor units are in an ON state, a size of said transistor group of each transistor unit turned off by pinch-off when the bias voltage is lowered is set to cover output power in a high power output mode, and a size of said transistor group of each transistor unit in the ON state when the bias voltage is lowered is set to cover output power in a low power output mode, and said amplifier is designed to increase an efficiency of said transistor group in the ON state when the bias voltage is lowered in the low power output mode.
Dependencies are inferred from the claim text.