Component to composite video signal converter circuit

Apparatus, comprising:

• a first source for providing a luminance signal;
• a second source for providing a chrominance signal;
• a summing amplifier having a first summing input AC coupled to said first source, having a second summing input AC coupled to said second source, and having an output for providing a composite video output signal;
• a first DC coupled output amplifier for coupling said composite video output signal from said output of said summing amplifier to a first load;
• a second DC coupled output amplifier for coupling said luminance signal from said first summing input of said summing amplifier to a second load;
• a third DC coupled output amplifier for coupling said chrominance signal from said second summing input of said summing amplifier to a third load;
• and
• a bias source in said summing amplifier for producing a first DC bias at the output of said summing amplifier for DC biasing said first output amplifier and for producing a second DC bias at said first and second summing inputs of said summing amplifier for DC biasing said second and third output amplifiers.

A component to composite video converter, comprising:

• a source (18) for providing a component video input signal including a luminance component Y1 and a chrominance component C1;
• first and second circuit nodes (A, B) AC coupled to said source for receiving respective ones of said video input signal components;
• a summing amplifier (Q1) having a relatively low impedance signal input terminal for summing currents supplied thereto, having an output load (R5) for developing a composite video signal proportional to the summed currents at said input terminal and having a bias input terminal coupled to a bias voltage source (R7,R8,24,Vcc) for establishing a first predetermined DC level at said signal input terminal and a second predetermined DC level at an output of said amplifier;
• first and second resistors connected between respective ones of said circuit nodes and said signal input terminal of said summing amplifier for (i) applying the currents to said input terminal proportional to the AC components of said video input signal components for forming said composite video signal, for (ii) applying said first predetermined DC level produced at said signal input terminal of said summing amplifier to each of said first and second circuit nodes and (iii) providing resistance values selected relative to said output load of said summing amplifier for determining a relative gain for each component video signal summed;
• at least first, second and third utilization devices;
• a first DC coupled amplifier for coupling said output load of said summing amplifier to said first utilization device, a second DC coupled amplifier for coupling said first circuit node to said second utilization device and a third DC coupled amplifier for coupling said second circuit node to said third utilization device.