Color video switching circuit

Details Color video switching circuit Color video switching circuit

1987-05-01

1988-09-27

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358181, H04N 5262

Patent

active

047745630

ABSTRACT:
A color video switching circuit comprises a first and a second emitter-follower transistor receiving color video input signals from different sources and being connected at their emitters to a pair of oppositely poled diodes having a junction connected to a common output terminal. An AND gate and an inverter are coupled to the emitters of the transistors for applying complementary voltages thereto to simultaneously bias one transistor into saturation to preclude passage of its associated color video signal to the output terminal and bias the other transistor into its active region for coupling its associated color video signal to the output terminal. The diode associated with the saturated transistor is also back-biased to enhanced isolation of the non-selected video signal from the output terminal.

REFERENCES:
patent: 3702898 (1972-11-01), Webb
patent: 4104678 (1978-08-01), Van Roessel
patent: 4678929 (1987-07-01), Alpaiwalla

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