In this thesis, three broadband low-noise mixing circuits which use CMOS 130 nm technology are presented. As one of the first few stages in a receiving front-end, stringent requirements are posted on mixer performance. The Gilbert cell mixers have presented excellent properties and achieved wide applications. However, the noise of a conventional active Gilbert cell mixer is high. This thesis de...

A sandwich mixer consists of mixing two solutions in a channel, one central laminar flow being sandwiched between two outer flow solutions. The present numerical study considers the convection-diffusion of two reacting species A and B, provided respectively by the two incoming solutions. The simulations show how the diffusion coefficient, flow rate and species concentration ratios influence, vi...

A 2.4 GHz CMOS RF front-end using for ZigBee application is described. The front-end consists of a low noise amplifier and a down-mixer and uses a 2 MHz IF frequency. A common source with resistive feedback and an inductive degeneration are adopted for a low noise amplifier, and a 20 dB gain control step is digitally controlled. A passive mixer for low current consumption is employed. The RF fr...

We introduce a new dielectrophoretic particle microconcentrator that combines interdigitated electrodes with a chaotic mixer to achieve high-throughput (>100 microL/min) particle concentration. The interdigitated electrodes use positive dielectrophoresis to attract particles to the surface, while the chaotic mixer circulates the particles to increase the number brought in proximity with the sur...

This paper presents a passive mixer combined with a 1st-order active low-pass filter implemented in a purely digital low-power 65 nm CMOS technology. The filter consists of a four-stage operational amplifier with two feed-forward paths for a 3 dB corner frequency of 4 MHz. The mixer offers a very low flicker noise corner frequency of 80 Hz for DVB-H application. A fabricated test chip with inte...

This study presents a Ka-band direct-conversion receiver using 28-nm CMOS (Complimentary Metal Oxide Semiconductor) process for radar applications. The designed includes LNA (Low-Noise Amplifier), Mixer, and Baseband amplifier. adopts two-stage cascode amplifier structure. Then, the mixer is single-balanced passive with low flicker noise. At end, baseband transimpedance fat FET (Field-Effect-tr...

In microfluidics mixing of different fluids is a highly non-trivial task due to the absence of turbulence. The dominant process allowing mixing at low Reynolds number is therefore diffusion, thus rendering mixing in plain channels very inefficient. Recently, passive chaotic micromixers such as the staggered herringbone mixer were developed, allowing efficient mixing of fluids by repeated stretc...