DOI: 10.1109/isscc.1982.1156401
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Abstract: Analog Devices Semiconductor Wilmington, M AA VARIETY of signal-processing functions common t o many electronic fields have been combined in a completely selfcontained monolithic circuit. These include modulation, demodulation, quadrature detection, synchronous detection, lock in amplification and square wave multiplication.The circuit provides an amplifying channel which can be changed rapidly betwen non-inverting and inverting gain under control of a second input. The gain is precisely preserved as the sign…

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