Video signal amplification circuit for mobile phone

Abstract

The invention discloses a video signal amplification circuit for a mobile phone. The video signal amplification circuit comprises an OPA676 amplification circuit, first to third resistors, first to third capacitors, a potentiometer and a power supply, wherein the first end of the first resistor is the signal input end of the video signal amplification circuit, the second end of the first resistor is respectively connected with the second lead pin end of the OPA676 amplification circuit and the first end of the second resistor, the first lead pin end of the OPA676 amplification circuit, the fifteenth lead pin end of the OPA676 amplification circuit and the sixteenth lead pin end of the OPA676 amplification circuit are grounded after being connected, the third lead pin end of the OPA676 amplification circuit is connected with the first end of the potentiometer, and the fourth lead pin end of the OPA676 amplification circuit is connected with the second end of the potentiometer. The video signal amplification circuit for the mobile phone solves the the problems of complicated circuit structures and unstable work state of the video signal amplification circuit for the mobile phone in the prior.

Description

technical field [0001] The invention relates to a signal processing circuit used in a mobile phone, in particular to a video signal amplifying circuit used in a mobile phone. Background technique [0002] Mobile phones are divided into smart phones and non-smart phones. Generally, the performance of smart phones is better than that of non-smart phones, but non-smart phones are more stable than smart phones. Most non-smart phones and smart phones generally use the CPU of the British ARM company architecture. However, the main frequency of the smart phone is higher, the running speed is fast, and the smart phone processes program tasks faster. It is more convenient in daily life (for example: Nokia n81 also has a main frequency of 1000 MHz), while non-smart phones have a lower main frequency and slower operation speed (for example: Nokia 5000 has a main frequency of 50 MHz). [0003] Smartphone (Smartphone) refers to "like a personal computer, with an independent operating sy...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the video signal amplification circuits used in mobile phones have the problems of complicated circuit structure and unstable working state.

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