| 摘要 |
<p>The power regulator, for an RF communications transmitter, automatically reduces the transmitter's power as the degree of mismatch to the antenna increases. Overload of the individual amplifier stages is thus prevented. A directional coupler (3) is located between the load (4) and the output of the transmitter's amplifier (2). The coupler produces two output voltages: one proportional to the forward power (Uv) and the second proportional to the reflected power (Ur). The two outputs (5, 6 and 7, 8) are combined and used to regulate the output power. The combining operation may be simple addition.</p> |
