| 摘要 |
<p>A feedforward amplifier and notch filter (300) according to the present invention uses a direct coupling of an amplifier stage (370) with the amplifier's load (RL). The main amplifier (304) is coupled through a transmission line (308) to the load (ZL). This direct coupled amplifier stage (370) is driven by an signal that induces a very low impedance in parallel with the load at the receive frequency, but appears as an open circuit at the desired frequencies so that the desired signal from the main amplifier (304) is virtually unaffected while output components at the receive frequency are cancelled.</p> |
