Logarithmic and exponential converter circuits

Details Logarithmic and exponential converter circuits Logarithmic and exponential converter circuits

1993-06-01

1995-11-28

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

327350, G05F 326

Patent

active

054711320

ABSTRACT:
A logarithmic amplifier has first and second mirror circuits, each having active transistors interconnected by a resistor. The current input is applied within one of the mirror circuits so that a logarithmic function thereof is generated for output by an output current mirror circuit. The mirror circuits are similarly constructed with an active transistor, a cascode transistor, and a base current compensating transistor. The cascode and active transistors are connected in series between an input node and a reference potential, or ground, with the base current compensating transistor connected between a supply voltage source and a base of the active transistor. The base of the base current compensating transistor is connected to the reference current input node. Through modification of the basic circuit by injection of an input current to the active transistor with respect to the reference potential, an exponential converter is presented.

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