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Wednesday, October 21, 2009

Simple High Input Impedance DC Summing Amplifier Using CMOS

This is a design circuit for DC summing amplifier that has high input impedance of 10 MOhm. This circuit is built by CMOS op amps. This is the figure of the circuit.


10 MOhmis used as basic summing amplifier input resistor. The input leakage current of the op amps therefore limits the input voltage resolution and the minimum discernable voltage signals. The CMOS op amps that used is very low input leakage current specifications guaranteed would be required for the application. This circuit is simplest form of the circuit. The recommended CMOS op amps that can be used is ALD1701, ALD1702 and ALD1704. [Circuit source: Advanced Linear Technology, Inc].

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