Log conversion circuit

Details Log conversion circuit Log conversion circuit

1994-09-15

1996-06-11

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

327563, H03G 1108

Patent

active

055259243

ABSTRACT:
A log conversion circuit comprising first and second input terminals to which voltage signals are input, first and second resistors, first ends of which are respectively connected to the first and second input terminals, first and second PN junction element sections connected in series and in opposite polarities, between a second end of the first resistor and a second end of the second resistor, a biasing circuit connected between a first source terminal and a node between the first and second PN junction element sections, first and second current sources for determining potentials at both ends of the first resistor, the first current source means connected between the first end of the first resistor and the first and second source terminals, and the second current source means being connected between the second end of the first resistor and the first and second source terminals, third and fourth current sources for determining potentials at both ends of the second resistor, the third current source means connected between the first end of the second resistor and the first and second source terminals, and the fourth current source means being connected between the second end of the second resistor and the first and second source terminals, and first and second output terminals for outputting voltage signals generated in the first and second PN junction element sections.

REFERENCES:
patent: 3870964 (1975-03-01), Mills
patent: 5162678 (1992-11-01), Yamasaki

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