| The wireless communication area is developing rapidly in both the technical and commercial sides. As a result, fully integrated RF transceivers have become a hot topic. A CMOS solution would be preferred, enabling single-chip solutions of the whole transceiver and resulting in substantially reduced cost.; This thesis deals with monolithic active filter design for RF receivers in CMOS technology, which is an important area for the fully integrated single-chip solution of RF transceivers. Since analog continuous-time filter is the most suitable choice for the receiver applications, we focus the research work in this area.; The filter synthesis method and the concept of gyrator are introduced first in this thesis, non-ideal effects of gyrator on filter performance are also summarized. Based on this knowledge, a simple biquadratic lowpass filter has been designed for a FSK demodulator, the structure of the OTAs in this filter and the use of MOSFET capacitors are discussed. The design of a 6th-order Chebyshev bandpass filter is then introduced in details. Design issues like synthesis of the filter, OTA performance and automatic tuning of the bandpass filter are covered. At higher frequencies, most filters are still realized by SAW filters that can not be integrated. New topology suitable for VHF/RF biquadratic filter design is then presented, it is followed by the discussion of a GHz bandpass filter design employing active inductors. All the above filters were fabricated in a 0.35μ m standard CMOS technology and experimental results are presented. |
