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...

The liquid streams in a microchannel are hardly mixed to form laminar flow, and the mixing issue is well described by a low Reynolds number scheme. The staggered herringbone mixer (SHM) using repeated patterns of grooves in the microchannel have been proved to be an efficient passive micro-mixer. However, only a negative pattern of the staggered herringbone mixer has been used so far after it w...

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...

This paper describes the implementation of the image rejection mixer block in the 5GHz frequency band using 0.18μm CMOS technology. The image rejection mixer block adopts the double-quadrature topology for high image-rejection ratio in the high frequency applications and is designed for the dual-conversion receiver. The loss of the polyphase filter in the signal path can be reduced with simple ...

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 proposed a 24-GHz frequency synthesizer (FS) for automotive radar application, which consists of a phaselocked loop (PLL) and an injection-locked frequency multiplier (ILFM). Based on a novel topology, the multiply-by2 ILFM consists of a double-balanced mixer and an injectionlocked oscillator (ILO). The PLL is designed with a 12-GHz voltage-controlled oscillator (VCO) and an injection-locked...

CMOS technology has reached its maturity. Therefore, design engineers used it for developing RF circuits. The advantages of CMOS technology are the higher integration, low-power consumption, low-voltage supply and low-cost compared with Bipolar technology. The use of CMOS process with low length for the channels of the MOSFETs is very important for high-frequency devices. This paper describes a...