Design of coplanar waveguide matching circuit for RF-CMOS front-end

Abstract

SUMMARYFor enhanced performance with smaller transceiver size at microwave frequencies, a design method is proposed in which the impedance matching network is included in the filter and integrated with the antenna. In this paper, a low noise amplifier (LNA) and a power amplifier (PA) are designed by the CMOS process. A method is presented in which the input and output impedances are matched on the chip by a matching circuit using distributed transmission lines. As the distributed transmission lines, coplanar waveguides (CPW) are used for realization of miniaturized design. First, the RF characteristics of the CPW meander line are evaluated by an electromagnetic field simulator and are compared with measured results. Next, an amplifier integrated with matching circuits is designed and its performance is predicted by a simulator. The targeted frequency of operation is 2.4 GHz for wireless LAN (IEEE802.11b).

Ultra-wide-band coplanar waveguide based impedance transformer using slow-wave electrodes

“…These proposed impedance transformers would operate below 20 GHz and are several centimeters long. Also, miniaturized impedance matching circuits utilizing meandered coplanar waveguide (CPW) were demonstrated 4,5 for MMIC wireless RF front-end applications. In these structures, the λ/4 CPW transmission lines are folded together to achieve size reduction.…”

Miniaturized high-band UWB monopole antenna

“…5 To realize the single metal layer, coplanar waveguide (CPW) is applied as a feed line. 6,7 CPW structure is suitable for three dimensional (3D) integration or stacking of the multilayer of the printed circuit board. Therefore, the antenna which is composed of a single metal layer is required for cost effective and thin devices.…”

A reconfigurable MEMS-less CMOS tuner for software defined radio

“…A reconfigurable tuner placed at the input of a low noise amplifier improves the noise figure, gain and linearity as the operating frequency is varied. As the output programmable tuner of a power amplifier, reconfigurable tuners can improve the power gain, efficiency and linearity as the frequency band, modulation scheme or power level is varied [1][2][3]. Implementing reconfigurable matching networks based on microelectromechanical systems (MEMS) has been previously reported [4][5][6].…”