Patent ID: 7904108

Claim:
A double transformer balun that is implemented in an integrated circuit, comprising: a double transformer operably coupled to convert a differential signal to an on-chip single-ended signal, wherein: the double transformer includes a first transformer and a second transformer communicatively coupled in a parallel manner such that the first transformer includes a first primary winding and a first secondary winding and the second transformer includes a second primary winding and a second secondary winding; a first leg of the differential signal provided to a first end of the first secondary winding connected to a first end of the second secondary winding; a second leg of the differential signal provided to a second end of the first secondary winding connected to a second end of the second secondary winding; the on-chip single-ended signal provided from a first end of the first primary winding connected to a first end of the second primary winding; and a second end of the first primary winding connected to a second end of the second primary winding and grounded; a matching impedance block, having a first end connected to the first end of the first primary winding and connected to the first end of the second primary winding for receiving the on-chip single-ended and having a second end for providing an off-chip single-ended signal to at least one of an antenna and a line and for providing impedance matching therefore.