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A 1.8-V 250-mA CMOS low-dropout regulator (LDO) with a current-efficiency rail-to-rail buffer to enhance load regulation is presented. The proposed buffer provides a push-pull output stage for driving pass device and pushes the parasitic pole far beyond the unity-gain frequency to improve phase margin of the LDO loop response. The proposed LDO has been implemented in a 0.35-μm CMOS process technology...
In this paper a low-power low-noise amplifier for neural recording and biomedical applications is presented. The frequency band of the amplifier is tunable. It has a gain of 28.3 dB. The low and the high cut-off frequency can be adjusted from 24 mHz to 30.6 Hz and 4.5 kHz to 7.47 kHz, respectively. The circuit is designed in 0.18μm CMOS process, and it consumes only 77.8 nW at 1.8V supply voltage...
A 100μW, 13bit ADC used for sensor array applications is presented in this paper. The ADC employs an extended counting architecture in which the residual error from a first-order incremental ΣΔ modulator is encoded by a cyclic ADC to achieve high accuracy at a relatively high speed. Hardware reuse technique is utilized for low power consumption and small silicon area. The prototype ADC is implemented...
A low-noise amplifier (LNA) employing novel self-biased shunt-feedback mechanism for X band applications is presented. The shunt-shunt feedback impedance is not only used to eliminate the use of gate-biased voltage, but also neutralize the miller capacitor of the input transistor. With combining current-reused technique into the amplifier, it is benefit to boost power gain and maintain low power consumption...
This paper proposes a new remote frequency calibration method that allows a passive wireless microsensor to adjust the oscillation frequency of its local oscillator using a calibrating reference signal sent by its reader. The reference signal is transmitted wirelessly by the reader in the form of a modulated tone. Frequency calibration is achieved by employing an injection-locking phase-locked loop...
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