High-Q HF microelectromechanical filters

Microelectromechanical Filters for Signal Processing

Microelectromechanical filters based on coupled lateral microresonators are demonstrated. This new class of microelectromechanical systems (MEMS) has potential signalprocessing applications for filters which require narrow bandwidth (high Q), good signal-to-noise ratio, and stable temperature and aging characteristics. Microfilters presented in this paper are made by surface-micromachining tech...

Tunable Microelectromechanical Filters that Exploit Parametric Resonance

Background: This paper describes an analytical study of a bandpass filter that is based on the dynamic response of electrostatically-driven MEMS oscillators. Method of Approach: Unlike most mechanical and electrical filters that rely on direct linear resonance for filtering, the MEM filter presented in this work employs parametric resonance. Results: While the use of parametric resonance improv...

High-Q variable bandwidth passive filters for Software Defined Radio

An important aspect of Software Defined Radio is the ability to define the bandwidth of the filter that selects the desired channel. This paper describes a technique for channel filtering, in which two passive filters are combined to obtain a variable bandwidth. Passive filters have the advantage of high linearity, low noise and inherent energy efficiency. After an explanation of the concept, t...

CMOS High Q-enhanced Filters for Radio Receivers

Q-enhanced LC filters are presented as an alternative to off-chip filters in a High-IF type heterodyne receiver. The dynamic range limitations of this type of filter are analyzed and a closed form expression is given for the dynamic range given circuit parameters and operating Q. Test chips are implemented that include both on and off-chip inductors to obtain filters in the frequency range of 5...

Microelectromechanical bandpass filters based on cyclic coupling architectures