- Tytuł:
- Hybrid Linearized Class-BD Double Sided (LBDD) Digital Pulse Width Modulator (DPWM) for Class-BD audio amplifiers
- Autorzy:
-
Kuta, S.
Kołodziejski, W.
Jasielski, J. - Powiązania:
- https://bibliotekanauki.pl/articles/93116.pdf
- Data publikacji:
- 2017
- Wydawca:
- Państwowa Wyższa Szkoła Zawodowa w Tarnowie
- Tematy:
-
class-D digital audio amplifier
Digital Pulse Width Modulator (DPWM)
Linearized Pulse Width Modulation (LPWM)
Linearized Class-AD Double sided (LADD)
Linearized Class-BD Double sided (LBDD)
Programmable Tapped Delay Line (PTDL)
Analog Delay Locked Loop (ADLL)
Digital to Time Converter (DTC)
cyfrowy wzmacniacz audio klasy D
modulator szerokości impulsu cyfrowego (DPWM)
zlinearyzowana klasa AD dwustronna (LADD)
programowalna opóźniona linia opóźnienia (PTDL)
pętla z opóźnieniem analogowym (ADLL)
konwerter cyfrowo-czasowy (DTC) - Opis:
- The paper presents an original architecture and implementation of 9-bit LBDD hybrid DPWM circuit for Class-BD digital audio amplifier. The input PCM signals are directly transformed into 24-bit LBDD DPWM signals and then are requanized to the 9-bit digital outputs using noise-shaping process to support high fidelity with practical values of time resolution, and finally are converted by the DTCs into the two physical trains of 1-bit PWM signals. The architecture of the proposed Class-BD hybrid DPWM circuit is composed of two Class-AD ones. The hybrid quantizer converts 6 MSB bits using counter method, based on the STM32F407xx microcontroller, while the remaining 3 LSB bits - using a method based on the Programmable Tapped Delay Line (PTDL). All necessary time waveforms are generated on the base of the internal microcontroller oscillator 168 MHz. The proposed 9-bit Class-DB DPWM circuit allows to attain SNR of 110 dB and THD about 0,2% within the audio baseband, at switching frequency of 328.1 kHz, clock frequency of 42 MHz and modulation index M = 0.95. Basic verification of algorithm and circuit operation as well as simulation and preliminary experimental results have been performed.
- Źródło:
-
Science, Technology and Innovation; 2017, 1, 1; 1-10
2544-9125 - Pojawia się w:
- Science, Technology and Innovation
- Dostawca treści:
- Biblioteka Nauki
Artykuł