Accuphase A 35 Brochure

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Accuphase A 35 Brochure

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n Power amplifi er assemblyPower amplifi er assembly with three parallel push-pull power MOS-FET pairs per channel mounted directly to large heat sink, MCS+ circuitry, and current feedback amplifi er. Current feedback principle assures excellent phase characteristics in high range As shown in the illustration, the A-35 uses the output signal current rather than voltage for feedback. Since the impedance at the current feedback point is very low, there is almost no phase shift. A minimal amount of NFB therefore results in maximum improvement of circuit parameters. INPUT OUTPUT INPUT Current NFB network I/V converter Current adder Trans-impedance amplifi er Amp- lifi er Principle of current feedback amplifi er Buffer Buffer Instrumentation amp confi guration allows fully balanced signal paths The newly adopted “instrumentation amplifi er” principle ensures that all signal paths from the inputs to the power amp stage are fully balanced. This results in excellent CMRR (common mode rejection ratio) and minimal distortion. Another signifi cant advantage is the fact that external noise and other external infl uences are virtually shut out. The result is a power amplifi er with drastically improved operation stability and reliability. Further refined MCS+ topology reduces noise even further Accuphase’s original MCS (Multiple Circuit Summing) principle uses a number of identical circuits connected in parallel to achieve superior performance characteristics. MCS+ is a further refi ned version of this approach. By extending parallel operation to the class A drive stage of the current/voltage converter, the noise fl oor has been further lowered. INPUT NFB NETWORK GAIN CONTROL CIRCUIT INPUT NFB NETWORK Signal input stage Power amplifi er stage OUTPUT Instrumentation amplifi er confi guration Instrumentation amplifi er and further refi ned MCS+ topology