Low voltage, simplified and temperature compensated logarithmic

Details Low voltage, simplified and temperature compensated logarithmic Low voltage, simplified and temperature compensated logarithmic

1993-04-28

1994-08-16

Kuntz, Curtis

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307490, 307491, 328145, H03G 300, G06G 712

Patent

active

053389859

ABSTRACT:
An electronic circuit with a logarithmic detector performs the following operations: receiving an input voltage, generating a series of subsequently amplified versions of the input voltage, rectifying the versions, thereupon rescaling and converting the versions into currents, summing the currents and applying the summed current to a resistor. With regard to the prior art the order of rectification and rescaling has been interchanged. As a result, the design is simplified, the circuit's supply voltage is lower than that of the prior art, and the circuit is more accurate and easier to compensate for temperature dependence.

REFERENCES:
patent: 3605027 (1971-09-01), Nichols
patent: 3992622 (1976-11-01), Numata et al.
patent: 4593268 (1986-06-01), Blauschild
patent: 4604532 (1986-08-01), Gilbert
patent: 4972512 (1990-11-01), Garskamp
patent: 4990803 (1991-02-01), Gilbert
"An Eight-Stage Log Amplifier", by D. Tran-Nguyen, RF Design Feature, Nov., 1986, pp. 84-89.
"Totally-Implantable Multichannel Biomedical Dimension Telemetry: Signal Generation and Detection Integrated Circuits and Telemetry Receivers", by K. K. Abadi, Integrated Circuits Laboratory, May, 1989, pp. 57-71.
"Monolithic Design Shrinks Logamp Architecture", by M. Parkyn, Microwaves & RF, Sep., 1990, pp. 179-183.
Signetics IC NE605 (FM IF/demodulator).

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