An electronic tuner for improving the intermediate-frequency circuit anti-interference ability
An electronic tuning and intermediate frequency technology, applied to color TV parts, TV system parts, TVs, etc., can solve the problems of poor stability of the whole machine, reverse interference of the whole machine in the connection mode, etc., and achieve the effect of improving adaptability
Inactive Publication Date: 2019-01-22
李志明
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The purpose of the present invention is to solve the problem that the existing electronic tuner and the connection mode of the whole machine equipment are susceptible to the reverse interference generated by the whole machine, resulting in poor stability of the whole machine
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0009] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.
[0010] In order to solve the problem that the existing electronic tuner and the complete device are easily connected by the reverse interference generated by the complete device, resulting in poor stability of the complete device, the present invention provides an electronic tuner that improves the anti-interference ability of the intermediate frequency circuit, such as figure 1 As shown, it includes an electronic tuner main chip, and the electronic tuner main chip includes a first intermediate frequency circuit output terminal and a second intermediate frequency circuit output terminal, and also includes a first resistor, a second resistor, a third resistor, a first capacitor, The second capacitor, the third capacitor and the fourth capacitor, the output end of the first intermediate frequency circuit is connected to one end of the first capac...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to an electronic tuner, which aims at solving the problem that the connection mode between the prior electronic tuner and the whole machine equipment is susceptible to reverse interference generated by the whole machine, and leads to poor stability of the whole machine. The electronic tuner of the invention comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor. Since a first resistor is added to the prior art, Second resistance, a resistor network composed of a third resistor, the high impedance characteristic of the low frequency signal can ensure that the intermediate frequency signal of the electronic tuner can be transmitted to the chip end of the whole machine without interference of the low frequency signal. The low impedance characteristic of the third capacitor and the fourth capacitor to the high frequency signal can filter the high frequency component of the intermediate frequency signal sufficiently to avoid the high frequency signal from interfering with the main chip of the whole machine through the intermediate frequency signal path. The invention is applicable to the connection of an electronic tuner and a whole machine equipment.
Description
technical field [0001] The invention relates to an electronic tuner, in particular to an electronic tuner which improves the anti-interference ability of an intermediate frequency circuit. Background technique [0002] The connection between the IF signal of the existing electronic tuner and the whole machine (including set-top boxes and TVs and other equipment applied to the electronic tuner) is directly connected through a DC blocking capacitor. The disadvantage of the existing solution is that the electronic tuner is easily affected by the whole machine. The reverse interference generated, such as frequency multiplication interference of the chip crystal oscillator at the end of the whole machine and power glitch interference, leads to poor stability of the whole machine. Contents of the invention [0003] The purpose of the present invention is to solve the problem that the existing electronic tuner and the complete machine equipment are susceptible to reverse interfer...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/50
CPCH04N5/50
Inventor 李志明
Owner 李志明