Amplifiers – Signal feedback – Plural amplifier channels
Patent
1988-04-28
1990-01-30
Mullins, James B.
Amplifiers
Signal feedback
Plural amplifier channels
330102, 330103, 330105, H03F 134
Patent
active
048976105
ABSTRACT:
Negative-feedback amplifier provided with an active amplifier section operating approximately as a nullor and a negative feedback section, the amplifier having a high loop gain. The active amplifier section is constructed in balanced form with two nullors connected in balance, and the negative-feedback section is composed of passive impedances and comprises two negative-feedback loops. In one embodiment each nullor has a series-coupling circuit and a parallel-coupling circuit at the input port. As a result an accurately defined or characteristic input impedance is obtained, and a series- or parallel-coupling circuit is formed in both negative-feedback loops at the output port, so that a high (current output) or low (voltage output) output impedance, respectively is obtained. In another embodiment each nullor has a series-coupling circuit and a parallel-coupling circuit at the output port. As a result an accurately defined or characteristic output impedance is obtained at the amplifier, and a current or voltage related both to the output current and voltage is fed to the input port, so that a low (current input) or high (voltage input) input impedance, respectively is obtained.
REFERENCES:
patent: 3260947 (1966-07-01), Dorsman
patent: 3516006 (1970-06-01), Donjon
patent: 3566298 (1971-02-01), Stevens
Hadley, "Isolation Amplifier", Wireless World, Jun.-1981, vol. 87, No. 1545, p. 67.
Huijsing et al., "Monolithic Nullor-A Universal Acitve Network", IEEE J. of Solid-State Circuits, vol. SC-12, No. 1, Feb. 1977, pp. 59-64.
Schwartz, "Transactors as Basic Linear Active Network Elements", Tijoschrift Van Het Nederlands Electronica-en Radiagenootechap, vol. 32, No. 2, 1967, pp. 45-54.
Electronik, vol. 21, No. 1, Jan. 1872, pp. 33-36.
Yanagisawa et al., "Realization of Arbitrary Conductance Matrix Using Operational Amplifiers" Electronics and Communications in Japan, vol. 59-A, No. 5, May 1976, pp. 45-52.
Mullins James B.
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