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As global consumption of mobile network is increasing, 4G base station must be designed in a context of improvement in power efficiency. This article presents a new concept of managing the DC-to-DC converter supplying power amplifiers in base stations, targeting a factor two reduction in power consumption. This new concepts provide new specifications for base stations but also for DC-DC converter. Details of the concept and the practical implementation of a 500 kHz and zero to 112W buck converter are discussed. Losses are analyzed and dynamic response is discussed. The prototype achieves 94% power efficiency and a good stability over the complete power range.

Despite the constant improvement in power efficiency of macro-cell base stations, the continuous capacity expansion increases considerably the global power consumption of the mobile network. This article presents a new concept of managing the DC-to-DC converter supplying power amplifiers in base stations, targeting a factor two reduction in power consumption. Details of the concept and the practical implementation of a 500 kHz and zero to 112W buck converter are discussed. The prototype achieves 94% power efficiency and a good stability over the complete power range.

This article presents a new problematic in DC-to-DC converter realized for 4G macro cell base station with efficiency improvement concepts. These concepts from EARTH project target a factor two reduction in 4G base station power consumption. The concepts are presented and detailed. DC-to-DC converter specifications needed are discussed. A practical implementation of a 500 kHz and zero to 112W buck converter is presented. The prototype achieves 94% power efficiency and a good stability over the complete power range.

In this paper we present a 2.7 V fully differential fourth-order bandpass filter developed and realised around four inductors electrically coupled using MOSFETs. Varactors are used for frequency tuning. An amplifier is cascaded at the input for noise and impedance matching. Philips QUBIC4 Si BiCMOS technology is used [1].

In this paper, we present a novel single-ended active integrated bandpass filter employing recursive principles. This circuit is based upon an original method to combine input and delayed feedback signals of a first-order recursive structure thanks to a differential pair combination. The chip surface is 1.12 mm². The filter performs a simulated gain close to 10 dB with a 160 MHz bandwidth. Power consumption is about 32 mW. Noise figure is 4.6 dB at the center frequency. Philips QUBIC4 Si BiCMOS technology is used [1].