Circuit arrangement comprising a logarithmic transfer function

Details Circuit arrangement comprising a logarithmic transfer function Circuit arrangement comprising a logarithmic transfer function

1997-03-06

1998-10-06

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

327352, H03G 1108

Patent

active

058182799

ABSTRACT:
A circuit arrangement having a logarithmic transfer function between an input signal and an output signal in a predefined level range of the input signal circuit which has a very low power consumption and low circuit complexity, includes a first pair of amplifier elements, namely transistors, forming a first differential amplifier and a second pair of amplifier elements, namely transistors, forming a second differential amplifier. The first pair of transistors have their emitters connected to each other and to a first current source, their collectors connected to working impedances subdivided by respective taps, and their bases receive the input signal between them. The second pair of transistors have their emitters connected to each other and to a second current source, their collectors connected to the collectors of the first pair of transistors, respectively, and their bases cross-connected to the taps of the working impedances. A rectifier stage has inputs connected to the collectors of the first and second pairs of transistors and an output at which the output signal is formed.

REFERENCES:
patent: 4442549 (1984-04-01), Main
patent: 4972512 (1990-11-01), Garskamp
patent: 5345185 (1994-09-01), Gilbert
patent: 5561392 (1996-10-01), Kimura

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