Logarithmic amplifier

Details Logarithmic amplifier Logarithmic amplifier

1989-03-09

1989-12-05

Mullins, James B.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328145, 329354, 330 54, G06G 724

Patent

active

048854832

ABSTRACT:
Logarithmic amplifiers which have a logarithmic transfer characteristic may be used in microwave instrumentation. Such an amplifier includes a series of MESFET distributed amplifiers (DA1-DA8) connected in cascade, with each of the MESFET distributed amplifiers (DA1-DA8) having a gate transmission line (G1-G8) and a drain transmission line (D1-D8) which share a common ground or source line (5), and a number of MESFETs (1-4) connected in parallel with their gate electrodes (g) connected at spaced intervals along the gate transmission line (G1-G8) their drain electrodes (d) connected at spaced intervals along the drain transmission line (D1-D8) and their source electrodes (s) connected to the source line (5). A low pass filter (LPF1-LPF8) is connected to the downstream end of the gate transmission line (G1-G8) of each distributed amplifier (DA1-DA8) with each low pass filter (LPF1-LPF8) passing only the rectified component of the travelling wave passing along each gate transmission line (G1-G 8). A summer (OP1) is connected to the outputs of each of the low pass filters (LPF4-LPF8) to sum them and provide an output (O/P) which provides the output of the logarithmic amplifier.

REFERENCES:
patent: 3668535 (1972-06-01), Lansdowne

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