| 主权项 |
1. A switchable capacitance circuit comprising:
a plurality of capacitance-switch cells, wherein each capacitance-switch cell comprises:
a capacitance circuit having a capacitance between a first terminal and a second terminal of the capacitance circuit; anda semiconductor switching circuit comprising
a first terminal coupled to the first terminal of the capacitance circuit,a plurality of series connected radio-frequency (RF) switch cells comprising a load path and a common node, wherein each of the plurality of series connected RF switch cells comprises a switch transistor and a gate resistor having a first end coupled to a gate of the switch transistor and a second end coupled to the common node, anda resistance circuit having a first end coupled to the common node and a second end coupled to a control node, wherein the resistance circuit comprises a resistance between the first end and the second end,wherein the gate resistor in each of the plurality of RF switch cells has a same resistance value,wherein the switch transistors in a first of the plurality of capacitance-switch cells has a first width, the switch transistors in a second of the plurality of capacitance-switch cells has a second width, and the first width is different from the second width, andwherein the resistance circuit in the first of the plurality of capacitance-switch cells is configured to set a switching time of the first of the plurality of capacitance-switch cells to substantially match a switching time of the second of the plurality of capacitance-switch cells, the resistance of the resistance circuit for first of the plurality of capacitance-switch cells being different from the resistance of the resistance circuit for the second of the plurality of capacitance-switch cells. |
