Integrated circuit and mobile terminal comprising same

Abstract

The invention provides an integrated circuit which comprises a first blocking capacitor, an amplifier and a high-pass filter, the high-pass filter is formed by connecting a second blocking capacitor and a switch resistor in parallel, and the switch resistor is formed by connecting a switch and a resistor in series, wherein one end of the first blocking capacitor is connected with the signal input end of the integrated circuit, the other end of the first blocking capacitor is connected with the negative input end of the amplifier, the output end of the amplifier serves as the signal output end of the integrated circuit, and the high-pass filter is connected with the input end and the output end of the amplifier.

Description

technical field [0001] The present invention mainly relates to the field of integrated circuits, in particular to an integrated circuit and a mobile terminal including the integrated circuit. Background technique [0002] Consumer electronic products have been widely used in daily life, where the input processing of audio signals (such as calls or recordings) and the conversion of voice into digital signals that can be processed by electronic products require the use of amplifiers. [0003] The processing effect of audio signals, such as the voice quality of calls, the voice recognition rate of smart speakers or AI products, and the sound effects of voice recorders, are important factors for consumers to choose products. In order to improve voice quality, such as noise suppression during calls, and far-field sound pickup by smart speakers, multiple microphones are usually used, and then software algorithms are used to enhance the acoustic processing effect. For example, a s...

AI Technical Summary

Problems solved by technology

The increase of the DC blocking capacitor will bring the following problems: (1) increase the quantity and cost of the bill of materials (Bill of Material, BOM); (2) increase the layout area of ​​the printed circuit board (PCB) and the electronic Design automation (Electronic design automation, EDA) routing complexity, which increases the difficulty of design; (3) capacitance mismatch, commonly used X5R type 100nF capacitor capacitance accuracy is generally ± 10%, for the use of differential input As far as the amplifier is concerned, the two capacitors may produce a mismatch of ±20%, which will increase the total harmonic distortion plus noise (TotalHarmonic Distortion+Noise, THD+N), affecting the audio performance

in satisfying f -3dB Under the condition of <20Hz, the equivalent input impedance of the amplifier needs to be above 4G ohms. To realize such an order of magnitude resistance on a 155mm process chip needs to occupy an area of ​​about 4mm*4mm, which is unacceptable in actual chip design.

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