KR840006585A - Signal sampling circuit - Google Patents

Abstract

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Description

Signal sampling circuit

Since this is an open matter, no full text was included.

1 is a partial view of a color television receiver having an automatic kinescope bias (AKB) control system including a signal sampling circuit and a level shifting circuit.

2 is a signal waveform related to the operation of the control system of FIG.

3 is a detailed view relating to the operation of the level shifting circuit of FIG.

Claims (18)

A signal sampling circuit operating during a reference interval and a subsequent signal sampling interval, comprising: a power supply of a reference voltage V _REF biasing means 51, a signal utilization means 58, an input and an input connected to the biasing means A first amplifier 53 and first switching means for selectively connecting said reference voltage source to said biasing means during said reference interval to establish a reference condition for said biasing means ( 40), (Vc) and second leveling means (40) (Vc) for selectively coupling the output of the second amplifier to the signal utilization means during the sampling interval, whereby And the first and second amplifiers exhibit substantially the same output signal at the end of the reference interval. 2. A signal sampling circuit as claimed in claim 1, wherein said signal utilization means (58) comprise an output capacitor and said biasing means (51) comprise an input capacitor. The signal sampling circuit according to claim 1, wherein said biasing means (51) comprises an input signal coupling capacitor. 2. A signal sampling circuit as claimed in claim 1, wherein said first amplifier (53) and said second amplifier (57) comprise a cross-conductance amplifier to provide an output current in response to an input voltage. 2. A signal sampling circuit according to claim 1, characterized in that the first amplifier (53) and the second amplifier (57) match each other and exhibit substantially similar operating characteristics. A signal input (base) according to claim 1, wherein an input amplifier 52 connects the biasing means to the inputs of the first and second amplifiers and the input amplifier 80 is connected to the biasing means ( A reference input (+) is connected to the reference voltage source (V _REF ) and an output is commonly connected to the inputs of the first and second amplifiers, the reference condition of the biasing means being connected to the input amplifier. And a signal sampling circuit for setting the input and output reference bias conditions. 7. The signal sampling circuit according to claim 6, wherein the input amplifier (52) exhibits a gain greater than the individual gains of the first and second amplifiers. 7. A signal sampling circuit as claimed in claim 6, wherein said biasing means (51) has a capacitance for alternatingly coupling a signal to a signal input of said input amplifier. 7. The signal sampling of claim 6, wherein said output of said input amplifier 52 comprises differential output circuits 80,81 commonly coupled to said inputs of said first and second amplifiers. Circuit. The method of claim 1, wherein the first amplifier 53 is in the conducting state during the reference interval and is in the nonconductive state during the sampling interval and the second amplifier 57 is in the nonconducting state during the reference interval and A signal sampling circuit characterized in that it is in a conducting state during a sampling interval. 2. The buffer circuit according to claim 1, wherein the biasing means has an input capacitance 51, a buffer circuit having a high impedance input connected to the output of the first amplifier and a low impedance input connected to the input capacitance. 56) supplies current to the input capacitance during the reference interval, and a low pass filter (54) is provided between the output of the first amplifier and the input of the buffer circuit. 2. The circuit of claim 1, in combination with an automatic black image current controller conducted by an image display device associated with a video signal processing system, wherein the system performs a video image blanking interval to derive the magnitude indication signal of the black image current. A means for activating and said derived signal is processed during a control interval comprising a reference interval and a subsequent sampling interval, said means 51 receiving said derived signal and said utilization means 58 processing said signal. An output capacitor connected to the system, wherein the second switching means 40, Vs are the sampling intervals to generate a bias control voltage to the output capacitor in accordance with the magnitude of the derived signal and to flow the required black current level. Selectively connect the output of the second amplifier to the output capacitor during Signal sampling circuit for a. The circuit of claim 1, wherein the black image current control system is operated during a control interval within an image blanking interval and is combined with a black image current level control system conducted by the image display device in a video signal channel of the video information display device. The biasing means 31 is connected to the means 30 for generating the magnitude-displayed output signal of the black image current, and the third amplifier 52 is a bias control signal to maintain the required black current level. Is provided with an output and a signal input for providing a video display device, and the level shifting means (55) is provided with the biasing means (51) for biasing the input of the signal meeting the requirements of the input bias of the third amplifier. Is connected to the signal input of the third amplifier 52, and the third switching means 40, V _B are at the level during the control short. And causing the movement means to be conducted and suppressing the input current to the level movement number during an interval other than the control interval. 15. The apparatus according to claim 13, wherein the display signal generating means (30) is connected to the video channel and the output of the signal generating means changes the signal in accordance with the video signal fluctuation change during the video signal image interval. And a reference condition is associated with a transient voltage of maximum amplitude by said video signal during an image interval. 14. A signal sampling circuit as claimed in claim 13, wherein said level shifting means (55) is in a nonconductive state during said other interval. 14. The apparatus according to claim 13, wherein said biasing means (51) comprises an alternating current coupling capacitor for coupling said display signal to said third amplifier (52) through a level shifting means (55), said capacitor being provided in said signal generating means. And a first terminal (+) connected to the output and a second terminal (-) connected to the level moving means, wherein the reference condition is set at the second terminal of the capacitor. 14. The third amplifier (52) according to claim 13, wherein the third amplifier (52) comprises differential input amplifiers (80) and (82) with differential outputs, wherein the third amplifier is provided for vision during the other interval by the level shifting means. And a signal sampling circuit, wherein the signal sampling circuit is provided. 14. The signal sampling circuit according to claim 13, wherein said level shifting means provides signal coupling lines (70), (71), and (72) from said biasing means to said third amplifier configured as semiconductor bonding means. . ※ Note: The disclosure is based on the original application.