This study aimed to formulate a hydrogel membrane containing chitosan (CS) and virgin coconut oil (VCO) using repeated cycles of freezing thawing (F-T) for wound dressing applications. evaluated the effects degree hydrolysis polyvinyl alcohol (PVA), solution concentration thickness, number F-T cycles, CS proportion on sensory properties, swelling ratio, gel fraction hydrogels. The antibacterial...

This paper presents a K-band CMOS cross-coupled pair voltage-controlled oscillator (VCO) that utilizes the varactor-only capacitor network. The proposed circuit features low parasitics and compact network, such varactor in analog tuning path directly affects oscillation frequency with large gain of VCO, digital results minimal noise sources, thus achieving phase for automotive FMCW radar applic...

We demonstrate the design of a novel voltage-controlled oscillator (VCO), which is based on a metal-oxide-semiconductor field-effect transistor (MOS) differential amplifier with active load. This VCO achieves low phase noise and wide tuning range. The phase noise is –120 dBc/Hz at 600 KHz offset from a 1.216 GHz carrier frequency. This value is comparable to that of a LC-based integrated oscill...

In this paper, a new Voicing Cut-Off Frequency (VCO) estimation method based on inverse filtering is presented. The spectrum of residual signal got from inverse filtering is split into sub-bands which are clustered into two classes by using K-means algorithm. And then, the Viterbi algorithm is used to search a smoothed VCO contour. Based on this new VCO estimation method, an adaptation of Harmo...

This paper reports of a method for design of Extreme Environment (EE) electronics using the MOSFET body bias as a temperature compensation method A Quadrature 435 MHz Voltage Controlled Oscillator (VCO) was used as the test element for design, modeling, and simulation. The VCO was simulated in an EE temperature environment between -250C to +200C and designed in the Honeywell 0.35 CMOS Partially...

The use of a VCO-based integrator and quantizer within a continuous-time (CT) analog-to-digital converter (ADC) structure is explored, and a custom prototype in a 0.13 m CMOS with a measured performance of 81.2/78.1 dB SNR/SNDR over a 20 MHz bandwidth while consuming 87 mW from a 1.5 V supply and occupying an active area of 0.45 mm demonstrated. A key innovation is the explicit use of the oscil...

A 2.5 GHz fully integrated voltage controlled oscillator (VCO) for wireless application has been designed in a 0.35μm CMOS technology. A method for compensating the effect of temperature on the carrier oscillation frequency has been presented in this work. We compare also different VCOs topologies in order to select one with low phase noise, low supply sensitivity and large tuning frequency. Go...

A voltage-controlled oscillator (VCO) tolerant to process variations at lower supply voltage was proposed. The circuit consists of an on-chip threshold-voltage-monitoring circuit, a current-source circuit, a bodybiasing control circuit, and the delay cells of the VCO. Because variations in low-voltage VCO frequency are mainly determined by that of the current in delay cells, a current-compensat...

In this paper we introduce a CMOS low voltage/low power (LV/LP) voltage controlled oscillator (VCO). It includes a simple V-I converter, a current controlled ring oscillator based on new differential delay cells, and a source-coupled differential pair to convert differential signal to single-ended signal. The V-I converter is implemented as a source follower type, exhibiting excellent linearity...

A fully integrated 5.8 GHz ETC transceiver LSI has been developed. The transceiver consists of LNA, down-conversion MIX, ASK detector, ASK modulator, DA VCO, and ∆Σ-fractional-N PLL. The features of the transceiver are integrated matching circuitry for LNA input and for DA output, ASK modulator with VGA for local signal control to avoid local leakage and to keep suitable modulation index, and L...