| 摘要 |
<p>An amplifier comprising a power stage (1) the output (VO) of which is compared with a reference level (VR1, VR2) by a comparator (7). If the output (VO) exceeds the reference level, a reduction is made in the gain of a variable-gain cell (5) upstream from the power stage. The reference level varies with temperature, and, more specifically, presents a high constant value (e.g. greater than the supply voltage) when temperature is below a predetermined threshold (e.g. 130 DEG C), and falls alongside an increase in temperature, when this exceeds the predetermined threshold. Thus, the input signal (VIN) is only attenuated in the event the output signal exceeds given values inversely proportional to temperature, and with no reduction in peak output at high temperature. <IMAGE></p> |
