Driver amplifiers with low noise standby mode characteristics

Details Driver amplifiers with low noise standby mode characteristics Driver amplifiers with low noise standby mode characteristics

1998-06-26

1999-11-30

Pascal, Robert

Amplifiers

Combined with automatic amplifier disabling switch means

330124D, H03F 114, H03F 368

Patent

active

059949554

ABSTRACT:
The present invention teaches a variety of driver amplifiers having a transmit mode suitable for driving the load resistance of a network with an amplified version of the input signal, and a standby mode wherein the driver amplifier consumes substantially no current and isolates the load resistance from the input signal. These amplifiers are also characterized in that during transitions back and forth between standby mode and transmit mode, a minimum of standby transient leaks out onto the network. Further, the noise power delivered to the network in standby mode is substantially minimized, the remaining noise being primarily due to thermal noise produced by a resistor utilized to provide matched termination to the network.

REFERENCES:
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patent: 4924191 (1990-05-01), Erb et al.
patent: 5325000 (1994-06-01), Birkeland et al.
patent: 5451907 (1995-09-01), Keane et al.
patent: 5488413 (1996-01-01), Elder et al.
patent: 5506544 (1996-04-01), Staudinger et al.
patent: 5631846 (1997-05-01), Snurkowski
patent: 5742591 (1998-04-01), Himayat et al.
patent: 5896062 (1999-04-01), Tiller et al.
Maxim Integrated Products, Product Data Sheet 19-1331; Rev O; Feb. 1998, "Upstream CATV Driver Amplifier--MAX3532".

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