Class-D Amplifier Power Stage With PWM Feedback Loop

Lam, Candice C.; Tan, Margaret; Cox, Stephen M.; Yeo, Kiat Seng

doi:10.1109/tpel.2012.2230027

Cited by 22 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…3(a), and the sample signals of the input and output waveforms are shown in Fig. 3(b) [17], [18], [19]. The input voltage passes through an anti-aliasing low-pass filter before being applied to the non-inverting input of an analog comparator.…”

Section: G Rmentioning

confidence: 99%

Dynamic FPAA-based Mixed-Signal Processing Circuit for Thin-Film CdTe/Lead-Free Perovskite Photodetectors

Пандиев

Aleksandrova

2021

ELEKTRON ELEKTROTECH

View full text Add to dashboard Cite

New photodetector structure combining thinned CdTe film with lead-free perovskite photoelectric film was produced and investigated. This setting of the CdTe thickness results in photodetector parameters’ competitiveness to the state-of-the-art in the field of advanced photoelectric materials. The device shows a promising sensitivity of ~40 μA/W, maximum responsivity of 10.6 mA/W at 460 nm, equal rise and fall times of 30 ms, and high linearity (maximum linearization error is less than 0.6 %). However, the optoelectronic performance of CdTe/lead-free perovskite structures integrated with signal processing circuit remains unexplored. For this purpose, Field Programmable Analogue Array (FPAA)-based mixed-signal processing circuit is developed for pulse width modulated electrical signal with duty cycle controlled by the illumination degree of the detecting photoelement. This novel approach guarantees a smooth change of the electrical output at a smooth change of the input illumination between the light and dark switching states and can be practically applied as a precise position detector of moving objects. The paper represents a synergistic connection between microelectronics, electronics, and signal technology.

show abstract

Section: G Rmentioning

confidence: 99%

Dynamic FPAA-based Mixed-Signal Processing Circuit for Thin-Film CdTe/Lead-Free Perovskite Photodetectors

Пандиев

Aleksandrova

2021

ELEKTRON ELEKTROTECH

View full text Add to dashboard Cite

show abstract

“…Beberapa penelitian telah dikembangkan pada Penguat audio kelas D untuk mengurangi distorsi dan meningkatkan efisiensi antara lain penelitian yang dikhususkan pada sistem umpan balik negatif menggunakan inverter base OTAs [2], menggunakan PWM feedback loop [7], dan sistem selfoscillating modulation with complete feedback network [4]. Sistem umpan balik negatif terbukti dapat memperkecil Total harmonic Distortion (THD) dan meningkatkan efisiensi [6].…”

Section: Pendahuluanunclassified

Penurunan Total Harmonic Distortion Pada Penguat Audio Kelas D Menggunakan Metode MQPSO

2019

View full text Add to dashboard Cite

Penguat audio kelas D merupakan penguat audio switching yang mempunyai efisiensi tinggi dibanding penguat audio konvensional (analog). Dalam kondisi ideal, penguat ini mempunyai efisiensi lebih dari 90%. Permasalahan umum yang terjadi pada penguat ini adalah distorsi karena bekerja secara non linier. Sebuah kompensator Proportional Integral (PI) digunakan sebagai filter analog pada umpan balik negatif dibandingkan antara metode trial dan error dengan metode Modified Particle Swarm Optimization (MQPSO) untuk mengurangi Total harmonic Distortion (THD) pada sebuah sistem. Metode MQPSO memiliki keunggulan dalam kinerja yaitu proses sederhana, implementasikan ke sistem sangat mudah dan didalam perhitungan sangat efisien. Hasilnya menunjukkan bahwa nilai THD tanpa optimasi 13.53% sedangkan dengan tambahan metode MQPSO sebesar 13.46% dengan FFT Tool Simulink Matlab V17 dengan selisih THD optimal sebesar 0.07%. Sedangkan pengujian waktu kestabilan yang terdiri dari parameter C2, R2, dan R1 didapatkan THD 0.116% pada 0.174s tanpa optimasi dan 0.113s menggunakan optimasi dengan selisih waktu sebesar 0.063s untuk mencapai kestabilan.

show abstract

“…Most of the class-D reported in literature does not contain a module allowing the analog volume control for audio, voice and FM [18][19]. In this work we will propose a new architecture of a class-D audio amplifier with analog volume control for high efficiency and low THD.…”

Section: Introductionmentioning

confidence: 99%

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

Khadiri¹,

Qjidaa²

2016

International Journal of Electronics and Telecommunications

View full text Add to dashboard Cite

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.

show abstract

Class-D Amplifier Power Stage With PWM Feedback Loop

Cited by 22 publications

References 23 publications

Dynamic FPAA-based Mixed-Signal Processing Circuit for Thin-Film CdTe/Lead-Free Perovskite Photodetectors

Dynamic FPAA-based Mixed-Signal Processing Circuit for Thin-Film CdTe/Lead-Free Perovskite Photodetectors

Penurunan Total Harmonic Distortion Pada Penguat Audio Kelas D Menggunakan Metode MQPSO

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

Contact Info

Product

Resources

About