- Tytuł:
- Linearized 9-Bit Hybrid LBDD PWM Modulator for Digital Class-BD Amplifier
- Autorzy:
-
Kołodziejski, Wojciech
Kuta, Stanisław - Powiązania:
- https://bibliotekanauki.pl/articles/1844591.pdf
- Data publikacji:
- 2021
- Wydawca:
- Polska Akademia Nauk. Czytelnia Czasopism PAN
- Tematy:
-
class-BD digital audio amplifier
linearized pulse width modulation (LPWM)
Linearized Class-BD Double sided (LBDD)
Digital to Time Converter (DTC) - Opis:
- The paper presents an original architecture and implementation of 9-bit Linearized Pulse Width Modulator (LPWM) for Class-BD amplifier, based on the hybrid method using STM32 microcontroller and Programmable Tapped Delay Line (PTDL). The analog input signals are converted into 12-bit PCM signals, then are directly transformed into 32-bit LBDD DPWM data of the pulse-edge locations within n-th period of the switching frequency, next requantized to the 9-bit digital outputs, and finally converted into the two physical trains of 1-bit PWM signals, to control the output stage of the Class-BD audio amplifier. The hybrid 9-bit quantizer converts 6 MSB bits using counter method, based on the peripherals of STM32 microcontroller, while the remaining 3 LSB bits - using a method based on the PTDL. In the paper extensive verification of algorithm and circuit operation as well as simulation in MATLAB and experimental results of the proposed 9-bit hybrid LBDD DPWM circuit have been performed. It allows to attain SNR of 80 dB and THD about 0,3% within the audio baseband.
- Źródło:
-
International Journal of Electronics and Telecommunications; 2021, 67, 1; 49-57
2300-1933 - Pojawia się w:
- International Journal of Electronics and Telecommunications
- Dostawca treści:
- Biblioteka Nauki
Artykuł