Stepless adjustable active DTV digital television amplifier with display and timing functions

Abstract

The invention provides a stepless adjustable active DTV digital television amplifier with display and timing functions. The amplifier is connected between an antenna and a coaxial cable, aims to adjust the amplification factor of the amplifier and detect and display the amplification factor of the amplifier, and is characterized by comprising an LNA amplification unit, an electrodeless adjustmentunit and a gain detection and display unit; the LNA amplification unit is provided with a source end, a radio frequency input end and a radio frequency output end, the source end is connected with a direct current source, the radio frequency input end is used for being connected with an antenna, and the radio frequency output end is used for being connected with a coaxial cable; the stepless adjusting unit comprises a potentiometer connected with a direct current source, and the output end of the potentiometer is connected to the source end of the LNA amplifying unit so as to provide bias voltage. The gain detection and display unit comprises a control chip, a display drive circuit and a display screen, and the control chip is connected to the stepless adjustment unit to collect real-timevoltage and display the magnification times corresponding to the real-time voltage on the display screen.

Description

technical field [0001] The invention relates to digital television technology, in particular to an active DTV digital television amplifier with infinitely adjustable band display timing. Background technique [0002] The working principle of the existing common active DTV digital TV antennas in the market is: the antenna vibrator sends the weak electromagnetic waves (including useful signals and interference signals) received in the air to the amplifier (LNA) through the coaxial cable to do the most basic For signal amplification, the multiple of the amplifier is fixed, and the antenna signal cannot achieve the best effect. The amplifier signal cannot be intuitively felt. Adding display technology can make people see the amplified signal more intuitively. Contents of the invention [0003] In order to overcome the problems mentioned in the background technology, the present invention proposes an active DTV digital television amplifier with a stepless adjustable band displa...

AI Technical Summary

Problems solved by technology

[0002] The working principle of the existing common active DTV digital TV antennas in the market is: the antenna vibrator sends the weak electromagnetic waves (including useful signals and interference signals) received in the air to the amplifier (LNA) through the coaxial cable to do the most basic Signal amplification, the amplifier multiple is fixed, the antenna signal cannot achieve the best effect, the amplifier signal cannot be intuitively felt, adding display technology can make people see the amplified signal more intuitively

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