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We describe a highly-programmable integrated sustaining amplifier for reconfigurable MEMS-referenced oscillators. The frequency response, voltage gain, and phase shift of the amplifier can be independently controlled using bias currents, thus enabling it to be interfaced with a variety of MEMS devices with resonant frequencies in the 10–120kHz range. The chip, which was designed in 0.5μm CMOS, also...
Efficient and smart techniques for analog data acquisition and processing may play crucial role in the design of miniature wearable devices, meant to continuously record, process and wirelessly transmit vital physiological parameters for real time health monitoring. In this work we propose a low-power, all-analog processing unit for an MPG (magneto-plethysmograph) based wearable device, which is meant...
In this paper, a technique for estimating frequency and amplitude of noncircular complex sinusoid has been presented. A cascade scheme of first-order complex notch filters has been introduced where complex sequence with negative frequency is rejected in the first section and sequence with positive frequency is removed in the second section. Closed-form expressions for bias and mean square error (MSE)...
Low delay maximally flat in passband and equiripple in stopband (MFER) FIR Digital Differentiators (DDs) are known to have high differential accuracy with low delay. The transfer function is defined as the subtraction of the stopband function from the passband function. The passband function and the stopband function realizes flatness characteristics and equiripple characteristics, respectively. However,...
A fourth-order Butterworth active Gm-C complex IF filter for dual-mode GNSS receiver is presented. This filter operates at center frequency of 7.161MHz and in bandwidth of 4MHz with pass-band gain of over 10dB and image rejection of over 35dB, which meets requirements of BD2 and Galileo Systems. The proposed CMOS fully differential transconductor has wide tuning range, high linearity and low power...
In this paper, a design architecture of a compact, concurrent quadband Doherty Power Amplifier (DPA) is proposed that relies on a new quadband band-pass filter comprising the input matching network. The filter — based on Quarter Wave Open Stubs (QWOS) at the desired operation frequencies — is embedded within the output arms of a wideband power divider to create the targeted four arbitrary frequencies...
This work presents a 180-nm CMOS bandpass ΣΔ Analog-to-Digital Converter (ADC) developed to fulfill the specifications of a fully-integrated receiver for Magnetic Resonance Imaging (MRI). CMOS integration of a multichannel digital receiver would increase the quality of the image without the need of using many coaxial cables to connect the RF coils (located close to the patient) with the digitizing...
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