Amplifier circuit with bipolar transistors

Details Amplifier circuit with bipolar transistors Amplifier circuit with bipolar transistors

1988-05-18

1989-07-04

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330149, 330306, H03F 3191

Patent

active

048454419

ABSTRACT:
The invention relates to a circuit comprising an amplifier with bipolar transistors, which amplifier is fed by a signal source with a complex internal resistance and which has a signal negative feedback path connecting the amplifier output to the signal source. For reducing the noise, especially the input noise current which is particularly predominant in circuits of this kind which have a sufficiently large source impedance, a reactance network is arranged between the amplifier and the signal source. The network, in connection with the signal source and the negative feedback path, constitutes a filter which is parallel to the amplifier input and which has at least a series resonance frequency within the signal frequency range.

REFERENCES:
patent: 4186360 (1980-01-01), Ohashi
patent: 4559503 (1985-12-01), Camand et al.
patent: 4779056 (1988-10-01), Moore et al.
Y. Netzer, "The Design of Low Noise Amplifiers", IEEE proc., vol. 69, No. 6, Jun. 1981, pp. 728-741.
K. B. Niclas, "Noise in Broad Band GaAs MESFET Amplifiers with Parallel Feedback", IEEE Trans. Microwave T & T, vol. 30, No. 1, Jan. 1982, pp. 63-70.
E. H. Nordholdt et al., "The Design of Extremely Low Noise Camera Tube Preamps", IEEE Trans. Inst. & Meas., vol. 32, No. 2, Jun. 1983, pp. 331-336.

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