CAPT OF AN LGT ACR ACFT INADVERTENTLY TAXIED PAST THE ACTIVE RWY HOLD SHORT LINE CAUSING ANOTHER ACFT TO GAR.

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THE EVENTS DESCRIBED BELOW OCCURRED DURING THE NIGHT HRS AT APPROX RWY 30L. I WAS THE FO ON WHAT WAS THE BEGINNING OF A SEQUENCE OF TRIPS; WITH A NEWLY PAIRED CREW; OUT OF OUR NEW BASE ASSIGNMENT SAN DIEGO. AFTER RECEIVING THE RTE CLRNC WE CONTINUED WITH THE ROUTINE ITEMS OF THE WT AND BAL AND STARTED ALL 3 ENGS WHILE MONITORING ATC GND CTL. OUR POS ON THE RAMP; S OF B4 TO THE ASSIGNED RWY 27; INVOLVED TURNING R (E). ONE OBSTACLE WAS NOT BEING ABLE TO SEE AROUND 3 PARKED 'HVY ACFT' ON THE SAME RAMP AREA TO OUR L (ALSO NEAR B4) AND STAYING CLR OF NUMEROUS PIECES OF GND SUPPORT EQUIP. I CALLED ATC GND CTL AND ADVISED THAT WE WERE 'READY TO TAXI; CARGO B4.' THE CTLR CLRED US TO TAXI TO RWY 27. THE CAPT ADVANCED THE PWR; UNDER A MARHSALLER'S DIRECTION; AND CONTINUED TOWARD THE VERY SHORT DISTANCE TO THE TXWY INTXN. CONTINUING WE STRAINED TO SEE AROUND THE PARKED ACFT TO OUR L. WE THEN BEGAN THE CHKLIST WHEN THE GND CTLR CALLED AND ASSIGNED US A NEW DEP FREQ. I ACKNOWLEDGED HIM AND WROTE DOWN THE FREQ ON MY CLIPBOARD (ATTACHED TO THE SLIDING WINDOW ASSEMBLY). THIS CHANGE BECAME A TURNING POINT OF DIVERSION IN COMBINATION WITH THE CROWDED RAMP AT NIGHT. THIS PARTICULAR ACFT HAD ONLY 2 COM VHF RADIOS AVAILABLE AND OUR COMPANY PROC DELEGATES THE #2 RADIO TO THE FE; WHICH CAUSES US TO WRITE DOWN ANY ADDITIONAL FREQS. AT THIS TIME WE MUST HAVE INADVERTENTLY TAXIED PAST OUR TURN; BUT STILL THINKING OUR INTXN WAS SIMPLY A R TURN AHEAD OUT OF PARKING. WHEN I LOOKED UP IT TOOK ONLY PART OF A SECOND TO RECOGNIZE THE WHITE RWY MARKINGS/LIGHTS AND ANOTHER FRACTION TO MENTALLY DENY THAT THIS COULD BE HAPPENING. THE CAPT TOOK IMMEDIATE EVASIVE ACTION TO TURN BACK ONTO THE TXWY AND I ACKNOWLEDGED GND CTL'S REQUEST TO TURN AND REJOIN THE TXWY. WE WERE CLRED FOR TKOF AND CONTINUED ON COURSE. SUPPLEMENTAL INFO FROM ACN 266126: JUST BEFORE WE GOT TO THE SOUTH TXWY; THE GND CTLR CHANGED OUR DEP FREQ. SINCE I WAS GOING TO BE THE PNF ON THIS LEG OF OUR FLT; I HAD TO LOOK DOWN AND WRITE THE NEW FREQ DOWN. THE FO ALSO LOOKED DOWN AND CHANGED THE FREQ. AS I DID THIS; I MISSED THE HOLD LINE AND DID NOT REALIZE I WAS TAXIING PAST IT. AS I TAXIED ONTO WHAT I PERCEIVED AS THE SOUTH TXWY; I REALIZED I WAS ON THE RWY 27 (ACTIVE RWY). I PERFORMED A R 180 DEG TURN AND TAXIED CLR OF THE RWY. AS I DID THIS THE GND CTLR TOLD US THAT THE 'ACFT ON FINAL WAS GOING AROUND.'