Abstract
Current addition, an approach to the design of linear transconductance elements with a very large linear input range, is explored. Design tradeoffs are discussed and a specific circuit is simulated by SPICE as an example. The results show that for a power supply of +or-5 V, the nonlinearity error of the sample circuit is controlled to +or-0.3% over a +or-3-V input range. OTA (operational transconductance amplifier) parameters such as tuning capability, frequency response, and output impedance are examined. The body effect is considered. A second-order filter is presented as an application. >
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