Rockford Fosgate PUNCH 4020 DSM manual transana, MOSFET Devices, Technical Design Features

TECHNICAL DESIGN FEATURES

◆trans•ana

The trans•ana (TRANS conductance Advanced Non-multiplying Amplifier) is a novel circuit that utilizes a short-loop complemen- tary topology and advanced Real Time Protection circuitry.

THE RESULT: An amplifier design with the benefits of tube and bi- polar transistor amplifier design without the limitations of either.

◆MOSFET Devices

Rockford Fosgate is one of the few manufacturers in any of the sound communities to utilize MOSFET devices in both the power supply and the output stages. MOSFET (Metal Oxide Semicon- ductor Field Effect Transistor) devices offer several important inherent advantages over the 30 year old technology of bi-polar design. These advantages include: thermal stability, switching speed, ultra low output impedance and wider bandwidth linear- ity. In addition, MOSFET and vacuum tubes share many impor- tant operating characteristics. However, the MOSFET device is much faster, wider in bandwidth, measurably lower in distortion and far more linear than vacuum tubes.

THE RESULT: Operational characteristics of vacuum tubes without the performance limitations of tube design.

◆DSM (Discrete Surface Mount) Technology

The DSM (Discrete Surface Mount) manufacturing process com- bines the advantages of both discrete components and integrated circuitry. Rockford Fosgate is the only American amplifier manu- facturer to have invested millions into this process. DSM compo- nents differ from conventional discrete components in three different ways. They are more compact and more rugged, and they take much better advantage of the PC board to allow them to get rid of any heat they generate. Using them wherever appropriate allows the advantages associated with discrete thru- hole circuitry to be retained while also providing room for both highly advanced processing features and generous PC board copper paths where needed. Their short lead-out structures allow maximum audio performance and highest signal-to-noise ratios

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