# Gain Linearity Adjustable Subtraction Circuit

2017-03-20 02:54

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As shown in the figure is a gainlinearity adjustable subtraction circuit. We can draw from circuit analysis : Changing the value of Rw can adjust that of the gain, which presents a linear change. Because the input end of this circuit uses two op-amps as voltage follower, input resistance can be increased greatly. The circuit chooses LM2900 (similar products like CF2900 / CF3900, LM3900) as its component. This series of devices is monolithic integrated current differential four operational amplifier, which is usually referred to as “NORTON amplifier. Its characteristic is that it has a wide range of the power supply, both single and dual powers are feasible, and the output is protected by short circuit.The typical values of the main parameters of LM2900 is as follows:

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