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This paper presents a design example of an ultra-low power single-channel analog front-end (AFE) integrated circuits (IC) and system for biomedical sensing applications. The 0.18-µm CMOS AFE IC design includes a low noise instrumentation amplifier (INA), a low-pass filter (LPF), a variable gain amplifier (VGA), and a successive approximation register (SAR) analog-to-digital converter (ADC). The AFE...
In this work, a balun low-noise amplifier (LNA) is designed and implemented in 0.18-µm CMOS process. The bulk cross-coupling (BCC) and capacitance cross-coupling (CCC) techniques are introduced in this LNA, which not only increase gain and linearity but also decrease noise figure. The 3 dB bandwidth extends from 1.27 GHz to 5.31 GHz. The maximum differential gain is 10.13 dB. Measured at 3 GHz, P1dB...
A low-power frequency tripler is designed by using the sub-harmonic mixer configuration for K-band applications. The proposed circuit features quadrature signal generation, applicable to LO signal synthesis in millimeter-wave wireless transceivers. It achieves conversion gain of -5.7 dB at the output frequency of 21 GHz. Implemented in a 0.18 mum CMOS technology, the circuit consumes power of 7.5...
In this paper, a direct up-conversion mixer with wide intermediate frequency (IF) bandwidth is designed and fabricated for 60-GHz applications. The up-converted differential signal is transformed to single-ended signal through an on-chip balun. In addition, an injection-locked frequency tripler is integrated for local oscillator signal generation. The measured results shows the maximum conversion...
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