| 摘要 |
A switched varactor circuit for use at least one operating frequency comprises a first resistive element having a first terminal and a second terminal, wherein the first terminal is coupled to receive a switching voltage; a hetero-junction bipolar transistor (HBT) having a base terminal, a first conducting terminal, and a second conducting terminal, wherein the base terminal of the HBT is coupled to a second terminal of the resistive element, and wherein the first conducting terminal is coupled to a first circuit node; and a first varactor having an anode coupled to the second conductive terminal of the HBT and a cathode coupled to a second circuit node, and wherein a capacitance value at the first circuit node is a function of the switching voltage. |
