Low noise tuned amplifier

Details Low noise tuned amplifier Low noise tuned amplifier

1981-06-12

1984-03-13

Mullins, James B.

Amplifiers

Signal feedback

Frequency responsive feedback means

330277, 330294, H03F 134

Patent

active

044370695

ABSTRACT:
A bandpass amplifier employing a field effect transistor amplifier first stage (10) with a resistive load (R.sub.2) either a.c. or directly coupled to the non-inverting input of an operational amplifier second stage (20) which is loaded in a Wien Bridge configuration. The bandpass amplifier may be operated with a signal injected into the gate terminal (G) of the field effect transistor and the signal output taken from the output terminal of the operational amplifier. The operational amplifier stage appears as an inductive reactance, capacitive reactance and negative resistance at the non-inverting input of the operational amplifier, all of which appear in parallel with the resistive load (R.sub.2) of the field effect transistor.

REFERENCES:
patent: 3405368 (1968-10-01), Howe
patent: 3597696 (1971-08-01), Rabindran
patent: 3967209 (1976-06-01), Skoures et al.
Anderson et al., "A Low Noise Amplifier with Application to Noise Thermometry Between 300 and 4k", Review of Scientific Instruments, vol. 45, No. 1, Jan. 1974, pp. 42-44.
Smith, "Transistor R-C Oscillators and Selective Amplifiers", Wireless World, Apr. 1963, pp. 183-185.

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