757N 757P

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Decade, High Accuracy Ratio Amplifiers
Models 757N, 757P
FEATURES Decade Operation 1/2% Conformity Symmetrical Inputs Voltage Current Operation Temperature Compensated APPLICATIONS Absorbence Measurements Ratios Voltages Currents Data Compression Transducer Linearization
GENERAL DESCRIPTION Model complete, temperature compensated, dc-coupled ratio amplifier. comprised input channels processing signals spanning decades dynamic range (1nA 1mA). virtue symmetrical input stages, accommodate this decade signal range either channel. conformity maintained within 1/2% over decades input (10nA 100µA) with over full input range. Unlike other ratio designs, model does restrict relative magnitude signal inputs achieve rated performance. Either input operated within specified range regardless signal level other channel. model log-ratio amplifier design makes available both input amplifier summing junctions. result, directly interface with photo diodes operating short-circuit current mode without need additional input circuitry. excellent performance model further improved means external scale factor output offset adjustments. significant feature model found competing devices that, when offset adjustment used establish fixed bias output, output offset level does vary function input signal magnitude. other designs, sensitivity output offset input levels results output effects resembling conformity errors. Model operate with either current voltage inputs. excellent performance makes ideally suited ratio applications such blood analysis, chromatography, chemical analysis liquids absorbence measurements.
CURRENT RATIO
Current ratio accomplished model when currents, ISIG IREF, applied directly input terminals (see Figure amps process these signals providing voltages which proportional their respective inputs. These voltages then subtracted applied output amplifier. scale factor, when connected shown, 1V/dec. However, higher scale factors achieved connecting external scale factor adjusting resistors.
Information furnished Intronics believed accurate reliable. However, responsibility assumed Intronics use; infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Intronics.
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757N 757P

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