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This work demonstrates the design and implementation of a multi-band multi-standard WLAN system consisting of a 5 - 6 GHz receiver and a 24 GHz down-converter. The main challenges are high frequency, broadband, and adaptive operation, power consumption and high integration level. This thesis introduces a multi-standard adaptive receiver concept to fulfill those requirements. The receivers are implemented in a standard 0.13 µm CMOS technology. A direct-conversion architecture for the 5 - 6 GHz band and a heterodyne architecture for a multi-band system are proposed. The most common receiver architectures are analyzed and the wave propagation effects are discussed. Then the most important receiver parameters are derived. Active and passive integrated components are investigated because understanding the device characteristic is a key requirement for a successful high frequency design. Finally, the multi-standard adaptive receiver concept is introduced. The choice of architecture, design and implementation of each of the receiver building blocks are discussed. The functionality of the 5 - 6 GHz receiver and the 24 GHz down-converter is demonstrated by the performance measurements. The main achievements of this work include: Firstly, a 5-6 GHz LNA integrated in 0.13 µm CMOS technology. The amplifier exhibits a gain of 16.5 dB, noise figure of 2.9 dB and 1 dB input compression point of -6.5dBm at power consumption of 7.5mW. The circuit features robust built-in input ESD protection. Secondly, a 5-6 GHz zero-IF receiver with analog pre-processing features a noise figure of 3.8 dB at the conversion gain of 43.4 dB. The channel select filter corner frequency is tunable to 6.5, 10, 20 and 50 MHz. The implemented analog pre-processing loop allows to adopt the linearity of the receiver to the input signal level. Thirdly, a 23-24 GHz tuned down-converter achieved the gain of 21.8 dB, noise figure of 6.8 dB and 1 dB input compression point of -16.7dBm at power consumption of 58.5mW.