SU1633514A1 - Tv signal generator - Google Patents

Abstract

This invention relates to a television (TV) technique. The purpose of the invention is to improve the accuracy and stability of the generated TV signal in case of supply voltage instability. The TV signal conditioner contains a transition capacitor 1, the first and second differential amplifiers (DU) on transistors 2, 3 and 4, 5. emitter follower on transistor 6, collector load on resistor 7, voltage divider on resistors 8 and 9, fixation unit 10 level, reference voltage source 11, switching unit 12 and current source 13. The image signal through the capacitor I goes to the first remote control, is allocated to the resistor 7 and, repeating on the transistor 6. enters the output of the driver, amplifying twice as the resistors 8 and 9 are equal. The black level of the image signal is equal to the potential of the first source output 11. When a damping pulse arrives at block 12, the current of source 13 connects the second remote control. and the output voltage of the driver becomes equal to the potential of the second output of source II. 1 il. Ch1ss S (L

Description

The invention relates to television (TV) technology and can be used in TV transmitting equipment for various purposes.

The purpose of the invention is to improve the accuracy and stability of the generated TV signal with instability of the supply voltage.

The drawing shows a structural E. geographic scheme of the shaper.

The shaper contains a transitional horse, ιτιιρ I, the first 2 and second 3 trans’s of the First Differential Force οι. the first 4 and second 5 transistors of the second, differential amplifier, trans. and.-6 emitter follower, resistor> collector npgrk. the first 8 and second 9 resistors of the voltage divider, block 10 fixing ’, ροιΐΗΗ. source 11 reference point | loaded) ‘I. b. kk | about switching and source 13 goka.

Form m and ro v: l. ' ’, Works as follows.

The signal and <ob |> and / Kenya, arriving at the input of the shaper through the transition capacitor I. The signal comes from the inverting input of the first diffsncdia. π .шн., \ rn.niie A la formed by the first 2 and second 3 transistors, standing out on the resistor 7 and repeating on the transistor 6. appears at the output of the former, amplifying twice with the equality of the first 8 and second 9 resistors and the level of “black "The image signal at the output of the shaper is fixed relative to a constant voltage equal to the potential of the first output of source II, while the current of the source 13 through the first output of block 12 connects the first differential antenna. lite.ty

When a quenching pulse appears on the reference input of block 12, the current of source 13 from the second output of block 12 connects a second differential amplifier formed by the first 4 and second 5 transistors, and the output voltage of the former becomes equal to the potential of the second output of source 11. The second output of which is connected to the output of block 10 The damping pulse amplitude thus formed is determined only by the reference voltage of the source 11.

With e <m, the damping pulse rhythms depend little on the instability of the supply voltage and the temperature instability of the parameters of the circuit elements. The accuracy of the generated TV signal is determined by the accuracy of the ratios of the first 8 and second 9 resistors, the accuracy of the reference voltage levels of the source 11.

Claims (1)

Claim A television signal generator containing a transition capacitor, the first output of which is an input for a video signal, and the second output is connected to the output of a level fixing unit, a collector load resistor, the first output of which is connected to a positive potential of the supply voltage, the negative potential of which is connected to the ground bus, and emitter a repeater made on a transistor, the emitter of which is the output of the generated television signal. characterized in that, in order to increase the accuracy and stability of the generated television signal with instability of the supply voltage, a first differential amplifier made of two transistors is introduced, the second differential amplifier. made on LPCH transistors, a voltage divider consisting of series-connected primary and second resistors, a reference voltage source, a switching unit and a power supply τ ·, κ; · .. whose input is connected to the ground bus, and the output of the current source SoynoBii h signal input of the switching unit. the control input of which is the input of d. d.! I am the blanking signal, and the first and ilora 31, .3.). 11) 1 block switching sospon.i. . respectively with the pairwise combined emitters of the first and second gangway spurs of the first differential amplifier and the first and second transistors of the first differential amplifier, the bases of the first and second transistors of the first differential amplifier are connected respectively to the second terminal of the transition capacitor and to the first terminal of the first resistor of the voltage divider, which is combined with the first output of the second resistor of the voltage divider, the second output of which is connected to the first output of the voltage reference , the second output of which is connected to the input of the level fixing unit, the bases of the first and second transistors of the second differential amplifier are connected respectively to the input of the level fixing unit, and to the second output of the first resistor, which is connected to the emitter of the emitter transistor. w. κίι. The hectors of the first and second granistors of the first differential amplifier are combined respectively with the collectors of the first and second transistors of the second differential amplifier and are connected respectively to the first and second terminals of the collector load resistor, the second terminal of which is connected to the base of the emitter follower transistor.