The interest in tiny wireless applications raises the demand for an integrated reference Oscillator with the same performance as the macroscopic quartz crystal reference Oscillators. The main challenge of the thesis is to prove that it is possible to build a MEMS based Oscillator that approaches the accuracy level of existing quartz crystal Oscillators. The MEMS resonator samples which Philips provides are measured and an equivalent electrical model is designed for them. This model is used in the simulations of the Pierce Oscillator and the transresistance amplifier Oscillator that are evaluated in this thesis. Finally the Pierce Oscillator is implemented in the A BCD2 process and manufactured at Philips Semiconductors in Nijmegen, The Netherlands.

This paper describes a method for wireless energy transfer via near-field electromagnetic inductionthat is inexpensive, simple and can be applied to almost any type of system, regardless of size andenergy demands.The method uses a primary unit consisting of an Oscillator, amplifier and inductive coil thattransfers energy to a secondary unit consisting of a coil, rectifier and voltage regulator. Two typesof Oscillators and several amplifier designs were realized and evaluated together with a multitudeof flat coils of both monofilar and bifilar type.The results show that it is important to use an Oscillator whose frequency is dependent on theinductance of the connected transmission coil, such as the Colpitts Oscillator. This is preferable toan Oscillator with a preset frequency, such as a Schmitt-trigger Oscillator..

This paper describes a method for wireless energy transfer via near-field electromagnetic inductionthat is inexpensive, simple and can be applied to almost any type of system, regardless of size andenergy demands.The method uses a primary unit consisting of an Oscillator, amplifier and inductive coil thattransfers energy to a secondary unit consisting of a coil, rectifier and voltage regulator. Two typesof Oscillators and several amplifier designs were realized and evaluated together with a multitudeof flat coils of both monofilar and bifilar type.The results show that it is important to use an Oscillator whose frequency is dependent on theinductance of the connected transmission coil, such as the Colpitts Oscillator. This is preferable toan Oscillator with a preset frequency, such as a Schmitt-trigger Oscillator..

In this Master's thesis, a direct-conversion receiver front-end has been designed in a 0.18um CMOS technology. Direct-conversion receivers (DCR) have obvious advantages over the heterodyne counterpart. Since the intermediate frequency (IF) is zero, the problem of image is circumvented. As a result, no front-end image reject filter is required and the channel selection requires only a low-pass filter, which makes it easy to integrate directly on chip. However, the DCR also suffers from several drawbacks such as extreme sensitivity to DC offsets, 1/f noise, local Oscillator (LO) leakage/radiation, front-end nonlinearity and I/Q mismatch.