Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1989-10-10
1991-04-09
Mottola, Steven
Amplifiers
Signal feedback
Phase shift means in loop path
330150, 330310, H03F 368
Patent
active
050068148
ABSTRACT:
A current amplifier including two stages. A first stage is formed by a primary operational amplifier (IC1) connected in a virtual earth feedback configuration and having a feedback loop formed by a resistor (R1) and capacitor (C1) connected in parallel so that the primary operational amplifier has a frequency response up to a predetermined frequency and thereafter the frequency response rolls off at a predetermined rate. A second stage including another operational amplifier (IC2) connected in a virtual earth or non-inverting feedback configuration having a frequency characteristic chosen to provide in combination with the frequency characteristic of the primary amplifier a desired operating range for the amplifier. The predetermined frequency lies between the frequency extremes of the operating range and the frequency characteristic of the second stage has a constant gain up to said predetermined frequency and a gain matched with and complementary to the roll-off of the primary operational amplifier (IC1) above the predetermined frequency so that the overall frequency response of the current amplifier is flat over its operating range.
REFERENCES:
Space Science Instrumentation, vol. 1, No. 4, Nov. 1975, pp. 471-492, D. Reidel Publishing Co., Dordrecht, NL; J. N. Stanley et al.: "An Alkali Vapour Magnetometer Using Integrated Circuits".
Mottola Steven
W.A. Technology Limited
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