Accuphase P 4100 Brochure

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Accuphase P 4100 Brochure

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Instrumentation amp conļ¬ guration allows fully balanced signal paths The newly adopted -œinstrumentation amplifier- 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 significant advantage is that external noise and other external influences are virtually shut out. The result is a drastic improvement in operation stability and reliability. Current feedback principle assures excel- lent phase characteristics in high range As shown in the illustration, the P-4100 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. Further reļ¬ ned MCS+ topology for even lower noise 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 refined version of this approach. By extending parallel operation to the class-A drive stage of the current/voltage converter, the noise floor has been lowered further. n Power ampliļ¬ er assembly with three parallel push-pull high-power transistor pairs per channel mounted directly to large heat sink, MCS+ circuitry, and current feedback ampliļ¬ er. Instrumentation ampliļ¬ er conļ¬ guration Signal input stage Power ampliļ¬ er stage + INPUT -“ INPUT Instrumentation ampliļ¬ er and further reļ¬ ned MCS+ topology Principle of current feedback ampliļ¬ er NFB NETWORK NFB NETWORK GAIN CONTROL CIRCUIT OUTPUT -“ INPUT Buffer + INPUT Buffer I/V converter Current NFB network Trans-impedance ampliļ¬ er Current adder Ampliļ¬ er Output