Logarithmic amplifier comprising MESFET distributed amplifiers c

Details Logarithmic amplifier comprising MESFET distributed amplifiers c Logarithmic amplifier comprising MESFET distributed amplifiers c

1989-03-09

1990-03-13

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307497, 328145, G06G 724, H03K 508

Patent

active

049085298

ABSTRACT:
Logarithmic amplifiers which have a logarithmic transfer characteristic are used, for example, in microwave instrumentation. Such an amplifier comprises a series of MESFET distributed amplifiers (DA1-DA8), each having a substantially linear transfer characteristic, connected in cascade. An input for the logarithmic amplifier is connected to an input end of the gate transmission line (G) of a first distributed amplifier (DA1) and the output end of the gate transmission line of each distributed amplifier is terminated by a demodulator (DM1-DM8) for demodulating amplitude modulation. Summing means (OP1) are connected to the output of each of the demodulators (DM1-DM8) to sum their outputs and thereby provide the output of the logarithmic amplifier.

REFERENCES:
patent: 3061789 (1962-10-01), Mace
patent: 3373294 (1964-11-01), Fujinami
patent: 4209714 (1980-06-01), Miyamoto
patent: 4531069 (1985-07-01), Parker
patent: 4720673 (1988-01-01), Hatfield
patent: 4812772 (1989-03-01), Hatfield
patent: 4853564 (1989-08-01), Smith et al.

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