Electrical laser fuse hybrid cell

Claim 3

The apparatus of claim 1, wherein said reference circuit comprises: a voltage terminal; a resistor, a reference transistor, a reference laser fuse and a reference electrical fuse coupled in a serial order; wherein said reference input of said current mirror is coupled to said reference transistor via said resistor, and said reference transistor is further coupled to said voltage terminal via said serially coupled reference laser fuse and reference electrical fuse.

Claim 4

The apparatus of claim 1, wherein said output current generated by said current mirror is equivalent to two times said reference current.

Claim 5

The apparatus of claim 1, wherein said current mirror comprises: voltage terminal; a first and a second transistor each having first, second and third terminals; wherein said first terminals of said first and second transistors are coupled to said voltage terminal, said second and third terminals of said first transistor are coupled to said reference input of said current mirror and to said second terminal of said second transistor, said third terminal of said second transistor is coupled to one of said at least one current output of said current mirror.

Claim 6

The apparatus of claim 2, said programming circuit further comprising: a transistor coupled with said electrical fuse and said laser fuse in a serial order; wherein one of said at least one current output of said current mirror is coupled to said transistor, said transistor is further coupled to said voltage terminal of said reference circuit via said serially coupled electrical fuse and laser fuse.

Claim 7

The apparatus of claim 5, further comprising: at least one inverter, having an input and an output, for inverting said first and second voltage levels; wherein each of said at least one current output of said current mirror is coupled to said output of said programming circuit and said input of said inverter.

Claim 8

The apparatus of claim 5, wherein said reference transistor and said transistor have identical sizes, said reference electrical fuse and said electrical fuse have identical resistive values, and said reference laser fuse and said laser fuse have identical resistive values.

Claim 9

The apparatus of claim 5, wherein said programming circuit further comprises: a programming input, a first input, and a second input; wherein during programming of said hybrid fuse circuit, said programming input is coupled to a programming signal via a first pad, said first input is coupled to said voltage terminal of said reference circuit via a second pad, and said second input is coupled to said voltage terminal of said reference circuit via a third pad such that when said programming signal is at a programming voltage level said electrical fuse is blown.

Claim 10

The apparatus of claim 5, wherein said laser fuse is blown by a applying a laser beam to said laser fuse.

Claim 11

The apparatus of claim 1, wherein said first voltage level is a logical "0" when one of said laser fuse and said electrical fuse is blown and said second voltage level is a logical "1" when both said laser fuse and said electrical fuse are left intact.

Claim 12

The apparatus of claim 4, wherein said voltage terminal of said current mirror is at Vcc.

Claim 13

The apparatus of claim 5, wherein said voltage terminal of said reference circuit is at Vss.

Claim 14

A programmable hybrid fuse circuit comprising: at least one programming circuit having an output, including, a voltage terminal, a laser fuse, an electrical fuse serially coupled to said laser fuse such that during programming one of said laser fuse and said electrical fuse is broken, a transistor coupled to said output of said at least one programming circuit and further coupled to said voltage terminal via said serially coupled electrical fuse and laser fuse; and a reference circuit for generating a reference current to a reference output terminal, including, a resistor, a reference transistor, a reference laser fuse and a reference electrical fuse-coupled serially, and said reference output terminal coupled to said reference transistor via said resistor, said reference transistor further coupled to said transistor and said voltage terminal of each said at least one programming circuit via said serially coupled reference laser fuse and reference electrical fuse; wherein said at least one programming circuit generates an output signal having a first voltage level or a second voltage level dependent on whether one of said laser fuse and said electrical fuse is broken.

Claim 15

A programmable hybrid fuse circuit comprising: at least one programming circuit having an output, including, a voltage terminal, a laser fuse, an electrical fuse serially coupled to said laser fuse such that during programming one of said laser fuse and said electrical fuse is broken, a transistor coupled to said output of said at least one programming circuit and further coupled to said voltage terminal via said serially coupled electrical fuse and laser fuse; and a reference circuit for generating a reference current to a reference output terminal, including, a resistor, a reference transistor, a reference laser fuse and a reference electrical fuse-coupled serially, and said reference output terminal coupled to said reference transistor via said resistor, said reference transistor further coupled to said transistor and said voltage terminal of each said at least one programming circuit via said serially coupled reference laser fuse and reference electrical fuse; wherein said at least one programming circuit generates an output signal having a first voltage level or a second voltage level dependent on whether one of said laser fuse and said electrical fuse is broken.

Claim 16

The programmable hybrid fuse circuit of claim 13, wherein the at least one programming circuit further comprises: an inverter coupled to said transistor.

Claim 17

The programmable hybrid fuse circuit of claim 13, further comprising: a current mirror having a reference input and at least one current output; wherein said reference input is coupled to said reference output of said reference circuit and each said at least one current output is coupled to each said output of each said at least one programming circuit, and said current mirror generates an output current for each said at least one current output in response to said reference current.

Claim 18

The programmable hybrid fuse circuit of claim 15, wherein said reference transistor and said transistor have identical sizes, said reference electrical fuse and said electrical fuse have identical resistive values, and said reference laser fuse and said laser fuse have identical resistive values.

Claim 19

The programmable hybrid fuse circuit of claim 16, wherein said first voltage level is a logical "0" when one of said laser fuse and said electrical fuse is broken, and said second voltage level is a logical "1" when both said laser fuse and said electrical fuse are left intact.

Claim 20

The programmable hybrid fuse circuit of claim 13, wherein said voltage terminal is at Vss.