System and method for driving radio frequency switch
First Claim
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1. A radio frequency (RF) switching circuit comprising:
- a plurality of series connected RF switch cells comprising a load path and a control node, wherein each of the plurality of series connected RF switch cells comprises a switch transistor andan impedance element, wherein an impedance of the impedance element decreases from a first RF switch cell at a first end of the plurality of series connected RF switch cells to a last RF switch cell at a second end of the plurality of series connected RF switch cells, the plurality of series RF connected switch cells comprises a first terminal coupled to a load path of the first RF switch cell at the first end of the plurality of series connected RF switch cells, and a second terminal coupled to a load path of the last RF switch cell at the second end of the plurality of series connected RF switch cells, the impedance element of each RF switch cell-comprises a parallel capacitor coupled in parallel with the load path of the switch transistor of the RF switch cell, and a capacitance of the parallel capacitor of the first RF switch cell is greater than a capacitance of the parallel capacitor of the last RF switch cell, the impedance element of each RF switch cell-comprises a parallel capacitor coupled in parallel with the load path of the switch transistor of the RF switch cell, and a capacitance of the parallel capacitor of the first RF switch cell is greater than a capacitance of the parallel capacitor of the last RF switch cell;
a plurality of first gate resistors coupled between control nodes of adjacent RF switch cells; and
an input resistor having a first end coupled to a control node of one of the plurality of RF switch cells and a second end configured to an output of a switch driver.
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Abstract
In accordance with an embodiment, a radio frequency (RF) switching circuit includes a plurality of series connected RF switch cells comprising a load path and a control node, a plurality of first gate resistors coupled between control nodes of adjacent RF switch cells, and an input resistor having a first end coupled to a control node of one of the plurality of RF switch cells and a second end configured to an output of a switch driver. Each of the plurality of series connected RF switch cells includes a switch transistor.
33 Citations
23 Claims
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1. A radio frequency (RF) switching circuit comprising:
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a plurality of series connected RF switch cells comprising a load path and a control node, wherein each of the plurality of series connected RF switch cells comprises a switch transistor and an impedance element, wherein an impedance of the impedance element decreases from a first RF switch cell at a first end of the plurality of series connected RF switch cells to a last RF switch cell at a second end of the plurality of series connected RF switch cells, the plurality of series RF connected switch cells comprises a first terminal coupled to a load path of the first RF switch cell at the first end of the plurality of series connected RF switch cells, and a second terminal coupled to a load path of the last RF switch cell at the second end of the plurality of series connected RF switch cells, the impedance element of each RF switch cell-comprises a parallel capacitor coupled in parallel with the load path of the switch transistor of the RF switch cell, and a capacitance of the parallel capacitor of the first RF switch cell is greater than a capacitance of the parallel capacitor of the last RF switch cell, the impedance element of each RF switch cell-comprises a parallel capacitor coupled in parallel with the load path of the switch transistor of the RF switch cell, and a capacitance of the parallel capacitor of the first RF switch cell is greater than a capacitance of the parallel capacitor of the last RF switch cell; a plurality of first gate resistors coupled between control nodes of adjacent RF switch cells; and an input resistor having a first end coupled to a control node of one of the plurality of RF switch cells and a second end configured to an output of a switch driver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radio frequency (RF) switching circuit comprising:
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a first plurality of series connected resistors; a second plurality of shunt resistors having first ends coupled between resistors of the first plurality of series connected resistors; an input coupling resistor having a first end coupled to a center tap of the first plurality of series connected resistors; a plurality of series connected transistors coupled between a first RF switch terminal and a second RF switch terminal, each of the plurality of series connected transistors having control nodes coupled to respective ends of the second plurality of shunt resistors, wherein a resistance of each of the first plurality of series connected resistors successively decreases from the center tap toward an end of the first plurality of series connected resistors; and a resistance of each of the second plurality of shunt resistors successively decreases from a first shunt resistor of the second plurality of shunt resistors coupled to the center tap to a first transistor coupled to the first RF switch terminal and successively decreases from the first shunt resistor of the second plurality of shunt resistors coupled to the center tap to a last transistor coupled to the second RF switch terminal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of operating a radio frequency (RF) switching circuit comprising a plurality of series connected RF switch cells having a load path and a control node, and an input resistor having a first end coupled to a control node of one of the plurality of RF switch cells, and a plurality of first gate resistors coupled between control nodes of adjacent RF switch cells, wherein each of the plurality of series connected RF switch cells comprises a switch transistor, and the method comprises:
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turning-on the RF switching circuit comprising applying an activation voltage to a second end of the input resistor, wherein the activation voltage corresponds to an on-voltage of the switch transistors of the RF switch cells; and turning-off the RF switching circuit comprising applying a de-activation voltage to a second end of the input resistor, wherein the de-activation voltage corresponds to an off-voltage of the switch transistors of the RF switch cells, wherein each RF switch cell further comprises a second gate resistor having a first end coupled to a gate of the switch transistor and a second end coupled to the control node of the RF switch cell; resistances of the first gate resistors coupled closer to the input resistor are higher than resistances of the first gate resistors coupled farther from the input resistor; and resistances of the second gate resistors coupled closer to the input resistor are higher than resistances of the second gate resistors coupled farther from the input resistor. - View Dependent Claims (22, 23)
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Specification