Amplifiers – With semiconductor amplifying device – Including signal feedback means
Patent
1988-10-27
1989-10-03
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including signal feedback means
330260, M03F 134
Patent
active
048722090
ABSTRACT:
In an amplifier arrangement, including a transadmittance circuit having an input coupled to an input of the amplifier arrangement, and a transimpedance amplifier having an input coupled to an output of the transadmittance circuit and an output coupled to an output of the amplifier arrangement, in which the transfer function modulus of the transimpedance amplifier has a first-order decrease above a first frequency F1 and a second-order decrease above a second frequency F2, which transimpedance amplifier is negatively fed back by means of a negative current feedback circuit, the negative current feed back circuit is constituted by a negative feedback impedance whose inverse of the transfer function modulus below the second frequency F2 is smaller than the transfer function modulus of the transimpedance amplifier and which transfer function modulus has a first-order increase above a third frequency F3 so that the transfer function modulus of the negatively fed back transimpedance amplifier has a first-order decrease above a fourth frequency F4 which is substantially equal to the third frequency F3, and a second-order decrease above the fifth frequency F5 which is located above the second frequency F2, the transfer function modulus of the transadmittance circuit has a first-order increase above a sixth frequency F6 which is substantially equal to the fourth frequency F4, so that the transfer function modulus of the amplifier arrangement has a first-order decrease above the fifth frequency F5, and the transimpedance amplifier has a low-ohmic current input with an input impedance whose modulus, at least for frequencies below the fifth frequency F5, is smaller than the modulus of the negative feedback impedance, so that the bandwidth of the amplifier arrangement is enlarged.
REFERENCES:
patent: 4540952 (1985-09-01), Williams
patent: 4555676 (1985-11-01), van de Plassche et al.
patent: 4574249 (1986-03-01), Williams
IEEE Journal of Solid-State Circuits, vol. SC-6, No. 6, Dec. 1971, pp. 347-352, van de Plassche, "A Wide-Band Operational Amplifier with a New . . . ".
Patent Abstracts of Japan, vol. 4, No. 48, (E-6)(530), 12 Apr. 1980.
Goodman Edward W.
Mottola Steven
U.S. Philips Corporation
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