Rockford Fosgate 250.1 Manuel d'utilisateur télécharger pdf (Page 5)

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TECHNICAL DESIGN FEATURES

Many of the solutions to common design problems encountered by Rockford Fosgate engineers created entire

new circuit designs as well as new ways to construct the Punch 250.

2 and 250.1 Power Amplifiers. In our flagship

amplifiers, no expense was spared in design and construction from the unique circuitry design to the

manufacturing process that has proven to be the industry reference for many years. Described below are just some

of the accomplishments achieved by our engineering and manufacturing staff.

◆ trans•

nova

(TRANSconductance NOdal Voltage Amplifier)

The trans•

nova

(TRANS conductance NOdal Voltage Amplifier) is a patented circuit (U.S. Patent 4,467,288) that

allows the audio signal to pass through the amplifier at

low voltage

. Each amplifier channel utilizes its own “fully

floating” power supply and is configured to increase power gain. The increase in power gain allows the drive

stage to operate at a lower voltage. A low voltage drive stage is the same principle used in high quality

preamplifiers to produce high linearity and wide bandwidth.

E-I I-E

trans•nova circuitry

The resulting design utilizes an output stage with a simpler gain structure and a shorter total signal path than

conventional high voltage (bi-polar) designs. The number of stages is reduced from five or more to three. The

output stage is further refined into a trans-impedance stage (current to voltage converter) to achieve a short loop

(fast) negative feedback. The output stage is driven cooperatively by a transconductance stage (voltage to current

converter).

THE RESULT: Superior sound quality, greater efficiency and higher reliability.

◆ DIABLO (Dynamically Invariant A-B Linear Operation)

DIABLO

(Dynamically Invariant A-B Linear Operation - patent application in process) is an important advance

in circuit design which reduces high frequency distortion. Amplifiers which utilize a large array of output

MOSFETs cause a high capacitive load on the driver stage. This load can make the high frequencies sound harsh.

The DIABLO circuit eliminates high frequency distortion by allowing the driver to operate with 20dB or more

of current headroom, whereas traditional drives have only 6dB of current headroom.

THE RESULT: Lower distortion and greater inherent stability.

◆ TOPAZ (Tracking Operation Pre-Amplifier Zone)

The

TOPAZ

(Tracking Operation Pre-Amplifier Zone) circuitry solves ground loop noise problems common to

automotive amplifier design. This innovative new development allows vastly improved isolation of the input

signal grounds from the power supply ground of the amplifier. This is accomplished by allowing the source unit

to control the potential “environment” of the entire input structure or “zone” of the amplifier. This process

improves the noise rejection of the amplifier by 30-40dB – an astounding 20-100 times better than amplifiers

without TOPAZ.

THE RESULT: Elimination of troublesome ground loop noise between source and amplifier.

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Rockford Fosgate 250.1 Manuel d'utilisateur Page 5

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