Amplifiers – Combined with automatic amplifier disabling switch means
Patent
1996-04-12
1997-02-25
Mullins, James B.
Amplifiers
Combined with automatic amplifier disabling switch means
250214A, 330110, 330308, 360114, H03F 308
Patent
active
056062826
ABSTRACT:
A transimpedance amplifier has an amplifier unit, a feedback resistor arranged between the output and input ends of the amplifier unit, a voltage clamp unit connected to the opposite ends of the feedback resistor, to clamp a voltage applied to the ends of the feedback resistor and prevent the amplifier unit from saturating, a current absorption unit arranged on the input side of the amplifier unit, to absorb any large input current supplied to the amplifier unit, and a switching selection unit to activate or deactivate the current absorption unit according to an external control signal. The current absorption unit is activated through the switching selection unit when a large input current is produced to write data to a magneto-optic disk in a magneto-optic disk unit in which the transimpedance amplifier is installed.
REFERENCES:
patent: 3968361 (1976-07-01), Bumgardner
patent: 4218613 (1980-08-01), Bletz
patent: 5007038 (1991-04-01), Nakane et al.
patent: 5030925 (1991-07-01), Taylor
IEEE Transactions on Consumer Electronics, vol. CE-32, No. 3, Aug. 1986, New US, pp. 651-657, Y. Fukushima et al `Integrated Circuits for Tape Recorder Operated by Single Dry Battery`, p. 656; figure 10.
Elektronik, vol. 40, No. 15, Jul. 1991 Munchen DE, pp. 59-62, XP 000243104 W. S. Ludolf `Digitale Ubertragung Mit Lichtwellenleitern 3. Teil: Optische Empfanger`; p. 60; figures 12-15.
Translation of pp. 59 and 60 of the reference Elektronik 40 (1991), 23 Jul., No. 15, Munich, Germany.
European Search Report dated Nov. 27, 1995.
Fujitsu Limited
Mullins James B.
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