IC Design of the Band-Gap Reference and the Triangular Waveform Generator of Class D Audio Amplifier

2014 ◽  
Vol 511-512 ◽  
pp. 757-763
Author(s):  
Si Min Zhang
Keyword(s):  
Band Gap ◽  
Power Supply ◽  
High Speed ◽  
High Efficiency ◽  
Battery Life ◽  
Waveform Generator ◽  
Rejection Ratio ◽  
Power Supply Rejection Ratio ◽  
Audio Amplifier ◽  
Class D

Class D audio amplifier can extend battery life for its small cubage and high efficiency. In connection with the advantages of Class D audio amplifier, a class D audio amplifier with high efficiency and low distortion is designed in this paper. A negative feedback is established to improve the linearity of the amplifier and power supply ripple rejection ratio. Minimizing the distortion of the system requires high-speed sampling. High-speed comparator is designed to meet this requirement. Moreover, the work requires that the chip has a band-gap reference with low temperature coefficient and high power supply rejection ratio.

One Kind of Band-Gap Voltage Reference Source with Piecewise High-Order Temperature Compensation and Power Supply Rejection Ratio

2014 ◽  
Vol 644-650 ◽  
pp. 3575-3578
Author(s):  
Zheng Da Li ◽  
Lin Xie
Keyword(s):  
Band Gap ◽  
Power Supply ◽  
Temperature Compensation ◽  
Supply Voltage ◽  
Voltage Regulation ◽  
Reference Source ◽  
Voltage Reference ◽  
Rejection Ratio ◽  
Power Supply Rejection Ratio ◽  
Supply Rejection

This paper designed a new band-gap voltage reference circuit with two-stage temperature compensation.It realizes non-linear temperature compensation by using NMOS-pipe leakage current and increases the power supply rejection ratio of the band-gap voltage reference source by introducing negative feedback between the operational amplifier and the power supply. What is more, the paper simulates the band-gap voltage reference source based on CSMC 0.5μm CMOS technique. The result as follow: the band-gap voltage reference source has the temperature coefficient of 8.2ppm/oC among-40-120oC with the supply voltage of 3V, the low-frequency power supply rejection ratio is 83dBat 27oC and the power supply rejection ratio is 71dB in 1KHz, the output voltage regulation is 1.05mV/V in the supply voltage range from 2.4V to 5V.

High Efficiency Half Bridge Class-D Audio Amplifier System With Front-End Symmetric Bipolar Outputs LLC Converter

2021 ◽  
Vol 68 (2) ◽  
pp. 1220-1230
Author(s):  
Duo Xu ◽  
Guohua Zhou ◽  
Rui Huang ◽  
Xianghong Liu ◽  
Feiming Liu
Keyword(s):  
High Efficiency ◽  
Audio Amplifier ◽  
Front End ◽  
Class D

scholarly journals Design of a Class-D Audio Amplifier With Analog Volume Control for Mobile Applications

2016 ◽  
Vol 62 (2) ◽  
pp. 187-196
Author(s):  
Karim El khadiri ◽  
Hassan Qjidaa
Keyword(s):  
Power Efficiency ◽  
High Efficiency ◽  
Harmonic Distortion ◽  
Cmos Technology ◽  
Volume Control ◽  
Ramp Generator ◽  
Audio Amplifier ◽  
Class D ◽  
Level Shifter ◽  
Programmable Gain

Abstract A class-D audio amplifier with analog volume control (AVC) for portable applications is proposed in this paper. The proposed class-D consist of two sections. First section is an analog volume control which consists of an integrator, an analog MUX and a programmable gain amplifier (PGA). The AVC is implemented with three analog inputs (Audio, Voice, FM). Second section is a driver which consists of a ramp generator, a comparator, a level shifter and a gate driver. The driver is designed to obtain a low distortion and a high efficiency. Designed with 0.18 um 1P6M CMOS technology, the class-D audio amplifier with AVC achieves a total root-mean-square (RMS) output power of 0.5W, a total harmonic distortion plus noise (THD+N) at the 8-Ω load less than 0.06% and a power efficiency of 90% with a total area of 1.74 mm2.

scholarly journals Design of Novel Low-Power and High-Efficiency Class-d Audio Amplifier

2017 ◽  
Vol 10 (3) ◽  
pp. 53-64
Author(s):  
Mohammad Mahdi Hajhashemkhani ◽  
Abdalhossein Rezai ◽  
Ahmad Karimi
Keyword(s):  
Low Power ◽  
High Efficiency ◽  
Audio Amplifier ◽  
Class D

A Bandgap Reference without Passive Components Based on Standard CMOS

2013 ◽  
Vol 475-476 ◽  
pp. 1679-1684
Author(s):  
Ye Chao Sun ◽  
Zhuo Lei Huang ◽  
Wei Bing Wang
Keyword(s):  
Power Supply ◽  
Supply Voltage ◽  
Inverse Function ◽  
Function Technique ◽  
Bandgap Reference ◽  
Micro Electro Mechanical Systems ◽  
Passive Components ◽  
Rejection Ratio ◽  
Power Supply Rejection Ratio ◽  
Temperature Ranges

A bandgap reference without passive components based on standard CMOS is proposed. Using an improved inverse-function technique without any curvature-compensated techniques, two reference voltages are got in different temperature ranges. One is 1.56V with a temperature coefficient of 9.2ppm/°C in the range [0, 14 °C at 3.3V supply voltage, and the other is 1.546V with 47ppm/°C in [-25, 15 °C at 3.3V. Its PSRR (power supply rejection ratio) is below-60dB at 10kHz, and it is quite suitable for integration in processing circuits of MEMS (micro-electro-mechanical systems) devices.

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