Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1982-09-24
1985-09-03
Mullins, James B.
Amplifiers
Signal feedback
Phase shift means in loop path
330306, H03F 304, H03F 134
Patent
active
045395250
ABSTRACT:
A two-stage band-pass amplifier filter circuit which uses a bi-quad amplifier in each stage, the bi-quad amplifier being connected between an AC feedback amplifier in the signal transmission path and ground. The bi-quad amplifiers each provide a variable impedance and effectively operate as series-resonant circuits such that, during closed loop operation, the overall amplifier-filter circuit has a high gain at or near resonance and a very low gain off-resonance and has a phase shift of 0.degree. at resonance and .+-.90.degree. substantially off-resonance. The bi-quad amplifiers are connected to the feedback resistance of the signal path amplifier via a coupling resistance, the signal path amplifier feedback resistance being greater than the coupling resistance, normally by a factor as high as 20 to 1, so that the bi-quad amplifier is thereby prevented from overloading during operation.
REFERENCES:
patent: 4122417 (1978-10-01), Takasaki et al.
Mullins James B.
Neil Brown Instrument Systems, Inc.
Wan G.
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