Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1992-12-15
1997-06-03
Mullins, James B.
Amplifiers
Signal feedback
Phase shift means in loop path
330294, H03F 134
Patent
active
056358717
ABSTRACT:
The invention features an apparatus and technique for amplifying a signal without creating a phase error. The apparatus is an active device with a restricted band width selected to include desired frequencies of operation. The apparatus includes at least one amplifier with a local feedback loop, formed by a network, constructed and arranged to exhibit a high forward gain at the operating frequencies. The amplifier and the network are constructed and arranged to provide substantially 180 degree phase shift between an input voltage and an output voltage at the operating frequencies. The apparatus also includes a signal input node adapted to introduce the input voltage to the inverting input of the amplifier, a signal output node adapted to obtain the output voltage from the output of the amplifier, and a resistive global feedback loop that connects the signal input and signal output nodes and controls the closed loop gain of the amplifying apparatus.
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Doble Engineering Company
Mullins James B.
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