| 摘要 |
<p>A tunable electronic filter circuit (10) includes an input terminal (12) and an output terminal (14) with a node (13) therebetween. An inductor (16), a variable capacitor (18), and a variable resistor (20) are connected between the node (13) and ground (21). A feedback control circuit (22) is coupled to tune the variable capacitor (18) to set the center frequency of the filter circuit (10) and to tune the variable resistor (20) in order to calibrate the Q of the filter (10). Optionally, a 'slave' tunable electronic filter circuit may be provided which includes a second variable capacitor and variable resistor which are also controlled by the feedback control circuit (22) which allows the 'slave' filter circuit to be tuned while being used.</p> |
