A multi step electromechanical converter for micro g capacitive accelerometers

A multi-step electromechanical Sigma Delta converter for micro-g capacitive accelerometers Külah, Haluk; Yazdi, N; Najafi, K (2003-01-01) A multi-step electromechanical /spl Sigma//spl Delta/ modulator for /spl mu/g accelerometers is described. A two-element sensor array is used in two /spl Sigma//spl Delta/ loops and resolution improves by >2x compared to a conventional 2nd-order /spl Sigma//spl Delta/ modulator. This CMOS chip operates at 1 MHz and provides 0.2-1.2V/pF sensitivity, <20aF resolution, >120dB dynamic range, and dissipates <12mW
A CMOS Based Current-to-Frequency Converter for Current Output Analog Accelerometers Nuzumlali, Omer Lutfi; Eren, Murat; Külah, Haluk (2013-04-25) This paper presents a novel design of a high resolution CMOS based current to frequency converter (CFC), also known as integrating analog to digital converter (IADC), especially for current output navigation grade accelerometers. Different from the traditional design, positive and negative input currents are separated from each other to eliminate the error due to both comparator offset voltages and mismatch in the value of integrating capacitor. Also, the output current of the accelerometer is directly inte...
A 180 nm Self-Powered Rectifier Circuit for Electromagnetic Energy Harvesters Ulusan, Hasan; Zorlu, Ozge; Külah, Haluk; Muhtaroglu, Ali (2013-12-18) This paper presents a new self-powered low voltage rectifier implementation for vibration-based electromagnetic (EM) energy harvesters. The proposed circuit is an improved version of the previously reported rectifier, which was designed in TSMC 90 nm CMOS technology. The circuit is designed in lower cost UMC 180 nm CMOS technology, and uses a passive AC/DC quadrupler structure to supply the external power of the utilized active components. Simulation results show that the maximum power conversion efficiency...
A wideband electromagnetic micro power generator for wireless microsystems Sari, Ibrahim; Balkan, Tuna; Külah, Haluk (2007-06-14) This paper presents a wideband electromagnetic (EM) vibration-to-electrical power generator which can efficiently scavenge energy and generate steady power over a predetermined frequency range. Power is generated by means of electromagnetic induction using a magnet and coils on top of resonating cantilever beams. The reported generator covers a wide band of external vibration frequency by implementing a number of serially connected cantilevers in different lengths. The device generates 0.5 mu W continuous p...
A high performance Sigma-Delta readout circuitry for mu g resolution microaccelerometers Ocak, Ilker E.; Kepenek, Reha; Külah, Haluk; Akın, Tayfun (Springer Science and Business Media LLC, 2010-08-01) This paper reports a second order electromechanical sigma-delta readout for micro-g resolution accelerometers in addition to other high-sensitivity capacitive microsensors with large base capacitance. The chip implements a switched-capacitor readout front-end and an oversampled sigma-delta modulator, and hence can be used for both open-loop analog readout and closed-loop control and readout with direct digital output. The readout circuit has more than 115 dB dynamic range and can resolve less than 3 aF/root...

Citation Formats

H. Külah, N. Yazdi, and K. Najafi, “A multi step electromechanical converter for micro g capacitive accelerometers,” 2003, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/69494.