Circuit arrangement having a pre-amplifier connected to an opto-

Details Circuit arrangement having a pre-amplifier connected to an opto- Circuit arrangement having a pre-amplifier connected to an opto-

1988-10-18

1989-09-26

Mullins, James B.

Amplifiers

Having light-controlled or activated device

330133, 330134, 330282, 330308, 250214A, 250214AG, H03G 330, H01J 4014

Patent

active

048703699

ABSTRACT:
A circuit arrangement has a pre-amplifier that has its input connected to an opto-electric transducer and whose gain is controllable by a final control element formed by a field effect transistor. In order to achieve an especially great range of dynamics, the pre-amplifier contains the drain-source path of a field effect transistor that is connected in parallel to a resistor in a feedback branch. This field effect transistor is activated or inhibited by a regulator. In this way, the range of control of a controllable amplifier arrangement following the pre-amplifier is doubly utilized. The circuit arrangement can be advantageously used in optical transmission equipment of PCM technology.

REFERENCES:
patent: 4053847 (1977-10-01), Kumahara et al.
patent: 4459475 (1984-07-01), Flint et al.
patent: 4495410 (1985-01-01), Minami et al.

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