SU1401644A1 - Video amplifier - Google Patents

Abstract

The invention relates to a TV technique. The purpose of the invention is to reduce power consumption. The device contains amplifying elements I and 2, transition capacitor 3, current source 8.

Description

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Key 4, integrator 5, adjustable resistance (PC) 6, current repeater (PT) 7, are entered. During horizontal sync pulses fed to the control input of key 4, the through current of the elec and 2 through the PT 7 and key 4 passes to the integrator 5. Moreover, at its input the current of the source 8 is subtracted from the through current. Thus, during the horizontal sync pulse, when a constant is present at the device input

the voltage equal to the level of quenching closes the feedback circuit, ensuring the maintenance of the constancy of the through current by means of the PC 6 adjustment unit. This stabilization of the through current allows it to be set to a very small value for any input signal and, consequently, reduces the power consumed in 1.5-2 times compared with the prototype. 1 il.

one

The invention relates to television technology and can be used to display devices. .

The purpose of the invention is to reduce power consumption.

The drawing shows a structural electrical circuit of video amplifiers. .

The video amplifier contains the first 1 and second 2 amplifying elements, i junction capacitor 3, switch 4, integrator 5, adjustable resistance; current repeater 6, and current source 8.

The video amplifier works as follows.

: The video signal is fed to the first: or second input of the video amplifier, which is determined by the convenience of connecting to previous devices. In alternating current, both inputs are connected via a transition capacitor 3 connected between the signal inputs of the first 1 and second 2 amplifying elements. With a positive drop in the input video signal, the second amplifying element 2 is unlocked and the first amplifying element I is locked, and if the input signal is negative, the reverse process is reversed.

During the horizontal sync pulses of a key 4 coming to the control input, the first 1 and second through-through current of the 2 amplifying elements through the current repeater 7 and the key 4 passes to the input of the integrator 5, and at the input

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de integrator 5 from the through current subtracts the current source 8 current. Meanwhile, during the horizontal sync pulse, when a constant voltage equal to the level of damping is present at the input of the video amplifier, the feedback circuit is closed, ensuring the maintenance of the constant through-current of the video amplifier by adjusting the value of the adjustable resistance 6.

Such a stabilization of the through current allows it to be set to a very small value for any input signal character and, as a result, leads to a reduction in power consumption compared to the known video amplifier by 1.5–2 times.

Claims (1)

Invention Formula The video amplifier containing the first amplifying element, the input of which is a constant voltage input, the signal input is the first input of the video amplifier, and the output is the output of the video amplifier and connected to the output of the second amplifier element, the signal input of which is the second input of the video amplifier and through the transition capacitor is connected to the signal input of the first amplifying element, as well as the current source, the first output of which is connected to the common bus, which is characterized by the fact that rebl emoy power introduced current repeater key in - 1401644 Tegrator and adjustable resistor with a key output, a control input, the first and second transducers of which is the input of the lower-case sync connected to the signal inputs of the corresponding impulses, and the input connected to the second first and second force output of the current source and the input of the rotation elements, and the control current amplifier, whose output is connected to the integrator's output, is connected to the input of the second amplifying whose inverting input is connected by an element.