MIXED SIGNAL DESIGN DOUBTS

mixed sinal routing

Hello Frends,

Currently I am working on 4 layer motherboard of LCD TV. This board contains high speed digital signals, Audio, video signals, Tuner ( RF) signals. Since the board size is very small at some places I have to route digital signals like HDMI ( Main controller to HDMI Receiver IC) below regulator section. Regulator is on the bottom side & big copper patch is also provided for all i/p & o/p current flows. HDMI Routing is on the Top side.Inner two layers are Power & Gnd planes. Will heating of regulator affect the HDMI signals ? Since I cannnot change the placement is there any other solution ? Pls help.

Also can I convert in anyway Cadence Allegro file ( .brd) to PADS (.pcb ) File ?

Pls let me know if anyone from Mumbai, India knows Cadence Allegro. I need urgent help.

Thanks in advance.... Kindly waiting for the replies !!
Byeee

Is regulator linear or switching? Noise is much more concern than heat I believe,

Converting BRD to PCB is not possible directly, you may need third party tools like Altium Designer.

Hi,

Thanks for the reply.

It is switching regulator ..i think switching regulators generate more noise than liner regulators (??),If we add GND shielding & copper pours with mutiple vias will this help to reduce the noise ?

Bye..

Yes, switching regulator operation is based on turning on/off a power supply on inductor and filter which means large amount of noise. Filtering and good baypassing is crucial, also take care of placement, separated plane also helps.