Preamplifier

Details Preamplifier Preamplifier

1992-12-23

1994-04-12

Mottola, Steven

Amplifiers

Signal feedback

Nonlinear impedance element in loop path

330308, H03F 308

Patent

active

053029119

ABSTRACT:
A preamplifier converting an input current signal into an output voltage signal and outputting the voltage signal includes a voltage amplifier, a feedback resistor connected in parallel with the voltage amplifier, and a plurality of diodes connected in series to each other and in parallel with the feedback resistor. In this circuit, the voltage drop of the feedback resistor for turning on the diodes increases in proportion to the number of diodes, thereby changing the input signal level at which the feedback resistance switches. A fuse may be connected in parallel with each of the diodes, a bonding pad may be connected to each of them, or an FET may be connected in parallel with each them to enable short-circuiting of each of the diodes. Thereby, an increased dynamic input range is obtained while giving consideration to the sensitivity and the amplification factor of the amplifier.

REFERENCES:
patent: 4218613 (1980-08-01), Bletz
patent: 4679251 (1987-07-01), Chown
Muoi, "Receiver Design for High-Speed Optical-Fiber Systems", Journal of Lightwave Technology, vol. LT-2, No. 3, Jun. 1984, pp. 243-267.
Minasian, "Optimum Design of a 4-Gbit/s GaAs MESFET Optical Preamplifier", Journal of Lightwave Technology, vol. LT-5, No. 3, Mar. 1987, pp. 373-379.

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