Patent ID: 9483666
Filing Date: 2016-11-01
CPC Classification: G06G

Claim Text:
1. A logarithmic and exponential function generator for analog signal processing, comprising: a pair of current mirrors having an input accepting an input current I a square root current amplifier circuit having an input accepting the first I where α is a current gain provided by the square root current amplifier circuit; a linear current amplifier accepting the second I where β is a current gain provided by the linear current amplifier; a DC current amplifier accepting a DC current I where γ is a current gain provided by the DC current amplifier, the outputs from the square root current amplifier circuit, the linear current amplifier, and the DC current amplifier being summed to provide a total output characterized by the expression: where α, β and γ are selected so that the total output expression represents an approximation of a function selected from the group consisting of a logarithmic function and an exponential function.