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Liu, Qilong (author), Breems, Lucien (author), Zhang, Chenming (author), Bajoria, Shagun (author), Bolatkale, M. (author), Rutten, Robert (author), Radulov, Georgi (author)In the pursuit of ever larger bandwidths, in recent years GHz-rate continuous-time (CT) oversampled ADCs have been reported in literature that achieve bandwidths of hundreds of MHz and have even exceeded the GHz barrier [1]-[3]. As impressive as these bandwidths are for CT ADCs, the required ADC architectures are complex, are sensitive to...conference paper 2022
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Zhang, H. (author), Karmakar, S. (author), Breems, Lucien (author), Sandifort, Quino (author), Berkhout, M. (author), Makinwa, K.A.A. (author), Fan, Q. (author)This paper describes a class-D audio amplifier with a multilevel output stage that reduces both EMI and idle power. High loop gain, and thus high linearity, are enabled by a relatively high (4.2 MHz) switching frequency, which relaxes the requirements on its output LC filter. Fabricated in a 180nm BCD technology, it can drive 14 W into an 8-Ω...conference paper 2020
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Karmakar, S. (author), Zhang, H. (author), Van Veldhoven, Robert (author), Breems, Lucien (author), Berkhout, M. (author), Fan, Q. (author), Makinwa, K.A.A. (author)Class-D amplifiers are often used in high-power audio applications due to their high power efficiency. They typically employ pulse-width modulation (PWM) at a fixed carrier frequency, which may cause electromagnetic interference (EMI). Setting this frequency f<sub>PWM</sub>) below the AM band (535 to 1605kHz) helps mitigate this, but its...conference paper 2020
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Karmakar, S. (author), Zhang, H. (author), van Veldhoven, Robert (author), Breems, Lucien J. (author), Berkhout, M. (author), Fan, Q. (author), Makinwa, K.A.A. (author)This article presents a 28-W class-D amplifier for automotive applications. The combination of a high switching frequency and a hybrid multibit Δ Σ M-PWM scheme results in high linearity over a wide range of output power, as well as low AM-band EMI. As a result, only a small (150-kHz cutoff frequency), and thus low-cost, LC filter is needed...journal article 2020
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Zhang, H. (author), Karmakar, S. (author), Breems, Lucien J. (author), Sandifort, Quino (author), Berkhout, Marco (author), Makinwa, K.A.A. (author), Fan, Q. (author)This article presents a Class-D audio amplifier for automotive applications. Low electromagnetic interference (EMI) and, hence, smaller LC filter size are obtained by employing a fully differential multilevel output stage switching at 4.2 MHz. A modulation scheme with minimal switching activity at zero input reduces idle power, which is...journal article 2020
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Cenci, P. (author), Bolatkale, M. (author), Rutten, R. (author), Ganzerli, M. (author), Lassche, G. (author), Makinwa, K.A.A. (author), Breems, Lucien (author)This paper presents a SAR-assisted Continuous-time Delta-Sigma (CT Δ Σ ) ADC, which combines the energy efficiency of SAR ADCs with the relaxed driving requirements of CT Δ Σ ADCs, as well as similar anti-alias filtering. When clocked at 2.4GHz, the ADC achieves 77.5dB SNDR in 40MHz BW. It consumes 3.2mW, resulting in a state-of-the-art...conference paper 2019