Method and circuit for increasing the output impedance of an ina

Details Method and circuit for increasing the output impedance of an ina Method and circuit for increasing the output impedance of an ina

1993-02-19

1994-07-05

Mullins, James B.

Amplifiers

Signal feedback

330255, 330260, 330 84, 330291, 330295, 330124R, H03F 136

Patent

active

053270959

ABSTRACT:
A method and circuit for increasing the output impedance of an inactive amplifier is provided. The method and circuit allows an increased number of amplifiers to be coupled in parallel to a single transmission line for distributing a plurality of video or other electrical signals to a remote location. The method and circuit increasing the impedance of an amplifier feedback network during inactive operation using a bootstrapping technique (i.e., by driving the feedback network) so as to increase the overall impedance of the amplifier during such operation.

REFERENCES:
patent: 4799026 (1989-01-01), La Barge et al.
"Maxim CMOS Video Multiplexer/Amplifier," data sheet published by Maxim Integrated Products, dated 1992, Sunnyvale, Calif., pp. 1-8.
"Maxim High-Speed Video Multiplexer/Amplifier," data sheet published by Maxim Integrated Products, dated 1992, Sunnyvale, Calif., pp. 1-12.
"Elantec EL2021C Monolithic Pin Driver," data sheet (dated Jul. 1991) published by Elantec, Inc. in the 1992 Data Book-Elantex, Milpitas, Calif., pp. 7-3 to 7-12.
"GX4314 Wideband, Monolithic 4x1 Video Crosspoint Switch," Preliminary Data Sheet published by Gennum Corporation in the Gennum 1992 Data Book, Ontario, Canada, pp. 2-41 to 2-43.
"GX434 Monolithic 4x1 Video Crosspoint Switch," data sheet published by Gennum Corporation in the Gennum 1992 Data Book, Ontario, Canada, pp. 2-31 to 2-39.
"CA3080, CA3080A Types-Operational Transconductance Amplifiers (OTA's)," data sheet published by RCA Corporation in the RCA Solid State Linear Integrated Circuits data book, dated 1978, USA, pp. 146-151.

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