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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 325

4 × 4 video crosspoint has 100MHz bandwidth and 85dB rejection at 10MHz

John Wright

Abstract

A 4 × 4 video crosspoint that has 100MHz bandwidth and 85dB rejection at 10MHz is described.

Keywords

4 × 4 video crosspoint

LT1205

4 × 4 crosspoint

The compact high performance 4 × 4 crosspoint shown in Figure 325.1 uses four LT1205s to route any input to any or all outputs. The complete crosspoint uses only six SO packages, and less than six square inches of PC board space. The LT1254 quad current feedback amplifier serves as a cable driver with a gain of 2. A ±5V supply is used to ensure that the maximum 150°C junction temperature of the LT1254 is not exceeded in the SO package. With this supply voltage the crosspoint can operate ...

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