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This paper presents a configurable 1/2/3 order Butterworth low pass(LP)/complex bandpass (CBP) filter for sub-GHz Applications in a 180-nm CMOS process. The filter employs operational transconductance amplifier (OTA) unit with feedforward capacitor instead of conventional two-stage amplifiers to broaden bandwidth while consuming no extra power. In order to achieve a good noise figure, extra noise...
This paper presents the design of a low-power 3rdorder continuous-time (CT) low-pass (LP) sigma-delta (ΣΔ) analog-to-digital converter (ADC) with 20MHz bandwidth. The bandwidth of the system is large enough to accommodate LTE and other wideband wireless network standards. A 3rd-order filter with feed-forward compensation is proposed to achieve low-power consumption and low complexity. A 3-bit flash...
Power consumption is one of the most critical issues in the portable software defined radio devices. A software radio receiver has to be able to select and, eventually, down convert a single narrowband channel from a collection of channels that in many practical cases are equally spaced and have equal bandwidth, while providing the minimum power consumption. In this paper we present an efficient solution...
An ultra-low-power four-channel sensor interface for wireless sensor networks employing semi-active RFID transponders as sensor nodes is described in the present paper. Each channel is based on a self-contained switched-capacitor second-order single-bit SigmaDelta-modulator operated in an incremental manner. The power consumption can be regulated through variation of the sampling frequency (max. 1...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
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