Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1987-06-26
1988-11-08
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
330255, 330257, G11C 2702, H03F 345
Patent
active
047836024
ABSTRACT:
An improved operational transconductance amplifier (OTA) for use in sample-and-hold circuits or the like requiring very low output leakage currents and equalized output current transients when the OTA is placed in stand-by (disabled.) The OTA has an output stage that is referenced to ground by having two darlington pairs with common collector outputs as the output for the OTA in a common base configuration such that when the OTA is disabled, any leakage paths from the output of the OTA are coupled to ground. Further, the OTA is compensated internally to equalize any current transient output when the OTA is placed in stand-by such that the integral of the current transient out of the OTA is substantially the same as the integral of the current transient into the OTA from the integrator. A sample-and-hold circuit is also described utilizing the improved OTA.
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patent: 4267519 (1981-05-01), Schade, Jr.
patent: 4636744 (1987-01-01), King et al.
B. J. Hosticka, Dynamic Amplifiers in CMOS Technology Electronics Letters, Dec. 1979, vol. 15, No. 25, pp. 819-820.
"Microelectronic Circuits", Adel S. Sedra and Kenneth E. Smith, 1982, MOS Amplifier with Enhancement MOS Load, pp. 323 and 324.
"Active Filter Design Using Operational Transconductance Amplifiers: A Tutorial", Randall L. Geiger and Edgar Sanchez-Sinencio, IEEE Circuits and Devices Magazine, Mar. 1985, pp. 20 through 32.
"A Precision Autozeroing Sample and Hold Integrated Circuit", Frank Gasparik, IEEE Journal of Solid-State Circuits, vol. SC-15, No. 6, Dec. 1980, pp. 945 through 949.
"A Precision FET-Less Sample-and-Hold with High Charge-to-Droop Current Ratio", George Erdi and Paul R. Henneuse, IEEE Journal of Solid-State Circuits, vol. SC-13, No. 6, Dec. 1978, pp. 864 through 873.
American Telephone and Telegraph Company AT&T Bell Laboratories
McLellan Scott W.
Zazworsky John
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