A Feed-Forward Power-Supply Noise Cancellation Technique for Single-Ended Class-D Audio Amplifiers

2014 ◽  
Vol 49 (3) ◽  
pp. 718-728 ◽  
Author(s):  
Adrian I. Colli-Menchi ◽  
Joselyn Torres ◽  
Edgar Sanchez-Sinencio
Keyword(s):  
Power Supply ◽  
Noise Cancellation ◽  
Power Supply Noise ◽  
Feed Forward ◽  
Audio Amplifiers ◽  
Supply Noise ◽  
Class D

scholarly journals Improved Error Correction Methods for Filterless Digital Class D Audio Power Amplifier Based on FCLNF

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Li Li ◽  
Hong-jie Li ◽  
Yan-jing Sun
Keyword(s):  
Error Correction ◽  
Power Amplifier ◽  
Power Supply ◽  
Cmos Process ◽  
Power Supply Noise ◽  
First Order ◽  
Supply Noise ◽  
Class D ◽  
Power Stage ◽  
The Impact

Aiming at correcting the error caused by the nonlinear and power supply noise of the bridge-tied-load (BTL) power stage of the filterless digital class D power amplifier, an error correction method was proposed based on feedforward power supply noise suppression (FFPSNS) and first-order closed loop negative feedback (FCLNF) techniques. This method constructed the first-order LCLNF loop for the power stage and further reduced the impact of the power supply noise on the power amplifier output by using FFPSNS technology to introduce the power supply noise into the feedback loop at the same time. The 0.35 μm CMOS process is used for analysis and comparison in Cadence. Cadence simulation results indicate that PSRR at the power supply noise frequency of 200 Hz is improved with 36.02 dB. The power supply induced intermodulation distortion (PS-IMD) components are decreased by approximately 15.57 dB and the signal-to-noise ratio (SNR) of the power amplifier is increased by 17 dB. The total harmonic distortion + noise (THD + N) of the power amplifier is reduced to 0.02% by FCLNF + FFPSNS.

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