Reconfigurable RF Switch using Single or Multiple-Pole, Single or Multiple-Throw Switches
Methods and devices taught in the present disclosure address the need for reconfigurable multi-pole multi-throw switches for various RF applications having different design requirements. Such reconfigurable switches can be reused for different applications without having to go through long research, development and manufacturing cycles. Design of multi-pole multiple switches with improved performance metric such as insertion loss, parasitic capacitance and bandwidth is also made possible using the teachings of the disclosure.
1 . A reconfigurable RF switch comprising a plurality of single-pole N-throw (SPNT) switches, wherein:
the reconfigurable RF switch is implemented on a single die;
all poles and throws of the plurality of SPNT switches are configured to be connected externally with respect to the single die;
N is an integer equal to or greater than 1;
the plurality of SPNT switches are separate with no interconnection within the single die, and
using a subset of or all of the SPNT switches of the plurality of SPNT switches, the reconfigurable RF switch is reconfigurable to operate as one or more of a) a plurality of single-pole, single-throw switches, b) a plurality of multiple-pole, multiple-throw switches and c) a combination thereof.
2 . The reconfigurable RF switch of claim 1 , wherein at least one of the SPNT switches of the plurality of SPNT switches has a number of throws that is different from a number of throws of the other SPNT switches of the plurality of SPNT switches.
3 . The reconfigurable RF switch of claim 1 , wherein all of the SPNT switches of the plurality of SPNT switches have a same number of throws.
4 . The reconfigurable RF switch of claim 2 , wherein each of the SPNT switches of the plurality of SPNT switches has a number of throws that is different from the number of throws of any one of the other SPNT switches of the plurality of SPNT switches.
5 . The reconfigurable RF switch of claim 1 , wherein each of the plurality of SPNT switches is a single-pole single-throw (SPST) switch.
6 . The reconfigurable RF switch of claim 1 , wherein each of the plurality of SPNT switches is a single-pole double-throw (SPDT) switch.
7 . The reconfigurable RF switch of claim 6 , wherein the plurality of SPNT switches comprises a number N1 of SPDT switches and wherein poles of (N1-1) of the SPDT switches are externally connected to one another to build an SP(2N1-2)T switch and wherein a pole of a remaining SPDT switch remains disconnected.
8 . The reconfigurable RF switch of claim 6 , wherein the plurality of SPNT switches comprises six SPDT switches and wherein:
poles of a first, a second and a third SPDT switch of the plurality of SPNT switches are externally connected to one other, and
poles of a fourth and a fifth SPDT switch of the plurality of SPNT switches are externally connected to each other;
thereby generating an M-pole N-throw (MPNT) switch comprising an SP6T, an SP4T and an SPDT switch.
9 . The reconfigurable RF switch of claim 1 , wherein each SPNT switch of the plurality of SPNT switches comprises series and shunt switches.
10 . The reconfigurable RF switch of claim 9 , further comprising a control circuitry providing control signals to turn the series and shunt switches ON or OFF.
11 . The reconfigurable RF switch of claim 9 , wherein each of the series and shunt switches comprises one or a plurality of FET or MOSFET transistors.
12 . A method of building a reconfigurable RF switch on a single die, the method comprising the steps of:
providing a plurality of single-pole N-throw (SPNT) switches on the single die, and
using a subset of or all of the SPNT switches of the plurality of SPNT switches, to reconfigure the reconfigurable RF switch to operate as one or more of a) a plurality of single-pole, single-throw switches, b) a plurality of multiple-pole, multiple-throw switches and c) a combination thereof;
wherein poles and throws of SPNT switches of the plurality of SPNT switches are all configured to be connected externally with respect to the single die, and wherein the plurality of SPNT switches are separate with no interconnection within the die.
13 . The method of building a reconfigurable RF switch on a single die of claim 12 , wherein at least one of the SPNT switches of the plurality of SPNT switches has a different number throws from at least one other of the SPNT switches.
14 . The method of building a reconfigurable RF switch on a single die of claim 12 , wherein the plurality of SPNT switches are all the same.
15 . The method of building a reconfigurable RF switch on a single die of claim 12 , wherein each of the plurality of SPNT switches is either single-pole single-throw (SPST) switch or single-pole double-throw (SPDT) switch.
16 . A method of configuring the reconfigurable RF switch of claim 1 , the method comprising steps of:
dividing the the plurality of SPNT switches into a plurality of groupings of SPNT switches, and
within each grouping of the plurality of groupings of SPNT switches, externally connecting poles of the SPNT switches of the each grouping of the plurality of groupings of SPNT switches to one another.
17 . The method of claim 16 , wherein poles of at least one SPNT switches of the plurality of SPNT switches remains disconnected externally with respect to the single die.
18 . The reconfigurable RF switch of claim 7 , wherein N1 is six.