Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1985-12-20
1987-08-04
James, Andrew J.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
357 231, 357 2314, 357 51, 330253, 330286, 437 8, H01L 2950, H01L 2952
Patent
active
046849653
ABSTRACT:
A programmable attenuator includes a plurality of field effect transistors (FETS) arranged together to provide an attenuation network. Each one of the FETS has a plurality of cell portions, each cell portion having drain, gate and source regions, the source and drain regions of the cell portions being connected in parallel. A first selected portion of the gate regions of each one of said FETS is connected to a gate electrode. A second selected remaining portion of the gate regions of each one of the FETS has the gate regions thereof isolated from the gate electrode. A signal fed to the gate electrode of each FET is distributed to the connected gate regions of each field effect transistor. In response to such signal, the total drain-source resistance of such FET is changed between a predetermined low value and a predetermined high value, with the resistance of the predetermined high value being determined, in part, by the number of such isolated gate regions.
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Sze Physics of Semiconductor Devices Wiley N.Y. 1981, pp 314-316.
Tajima Yusuke
Tsukii Toshikazu
Jackson Jerome
James Andrew J.
Maloney Denis G.
Raytheon Company
Sharkansky Richard M.
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