| 主权项 |
1. An apparatus comprising:
an input port; an output port; a low-pass filter connected between said input port and said output port; a bandpass filter; an inverter structure connected in series with said bandpass filter, said series-connected inverter structure and bandpass filter being connected in parallel with said low-pass filter between said input port and said output port, said inverter structure in turn comprising:
a transmission line; andan inverter connected in parallel with said transmission line by at least one fusible link without the use of any switch; and a controller coupled to said at least one fusible link; wherein said inverter structure, said bandpass filter, and said at least one fusible link, are configured, and wherein said controller is configurable, such that signals of a first frequency range, equal to a passband of said low-pass filter, are passed from said input port to said output port under a first condition when said at least one fusible link is intact, and such that signals of a second frequency range, equal to said passband of said low-pass filter plus a passband of said bandpass filter, are passed from said input port to said output port under a second condition when said at least one fusible link is caused to be blown by said controller. |
