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Video signal distribution system

  • US 6,177,963 B1
  • Filed: 12/01/1997
  • Issued: 01/23/2001
  • Est. Priority Date: 04/22/1996
  • Status: Expired due to Fees
First Claim
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1. A video signal distribution system including a video amplifier circuit having an input terminal connected to a video signal source and an output connected to a signal combiner that is arranged to receive signals from a video appliance, the signal combiner being arranged to provide signals input thereto to a television set, comprising:

  • a first transistor circuit arranged to receive video signals from the video signal source, the first transistor circuit including a first transistor circuit connected in a common emitter configuration with its base connected to an input terminal of the video amplifier circuit and arranged to provide a predetermined forward gain in signals input thereto such that signals output from the video amplifier circuit have amplitudes suitable for input to the television set;

    a second transistor circuit including a second transistor arranged in a common base configuration and having its emitter connected to the collector of the first transistor, the second transistor being arranged to provide a predetermined reverse loss to prevent transmission of RF signals from the video amplifier output to its input; and

    a third transistor circuit connected to the second transistor circuit and including a third transistor arranged in a common collector configuration to provide an impedance transformation such that the video amplifier has a predetermined output impedance at the emitter of the third transistor.

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