Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1981-09-10
1983-11-22
Mullins, James B.
Amplifiers
Signal feedback
Phase shift means in loop path
330109, H03F 134
Patent
active
044172150
ABSTRACT:
A non-inverting, direct current amplifier stage is cascaded into an integrator stage to form a two stage tuned network (10) having a single input junction common to both stages. The network provides independent adjustment of center frequency, bandwidth and voltage gain. The insertion of a positive feedback loop between the stages provides a very narrow bandwidth network (10'). The addition of back-to-back zener diodes between the common input node and ground converts the network into an oscillator (10").
REFERENCES:
Wireless World Oct. 1977, vol. 83, No. 1502 "Low Noise RIAA Amplifier".
Active Filter Has Separate Band and Frequency Controls, John Jenkins, p. 132 NSWC/WOL/TR 75-170, FIG. 4.
Bushnell Robert E.
Manning John R.
Mullins James B.
The United States of America as represented by the Administrator
Tresansky John O.
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