| 摘要 |
<p>An amplifier circuit includes a calibration circuit (300) with a controllable circuit element such as a digital resistor (310). One or more properties of the controllable circuit element (e.g., the resistance in a digital resistor (310)) is varied by a digital calibration word such that the voltage drop across the resistor (310) matches a reference voltage. The calibration word is also used to control the resistance of a transistor (420) that forms a part of a power amplifier to compensate for temperature and process variations. The amplifier may be a switching power amplifier, and the transistor may be a segmented transistor (420a-d) with the width (and hence the channel resistance) controlled by the digital calibration word.</p> |
