By Cristina Azcona Murillo
This booklet develops voltage-to-frequency converter (VFC) options built-in in normal CMOS expertise for use as part of a microcontroller-based, multisensor interface within the setting of transportable functions, quite inside a WSN node. assurance comprises the full layout stream of monolithic VFCs, in accordance with the objective software, in addition to the research, layout and implementation of the most VFC blocks, revealing the most demanding situations and ideas encountered in the course of the layout of such excessive functionality cells. 4 whole VFCs, each one temperature compensated, are absolutely designed and evaluated: a programmable VFC that comes with an offset frequency and a sleep/mode permit terminal; a low energy rail-to-rail VFC; and rail-to-rail differential VFCs.
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Extra resources for Voltage-to-Frequency Converters: CMOS Design and Implementation
MT-028 Tutorial: Voltage to frequency converters. Analog Devices Tutorials. : Converters for different variables to frequency-time parameters of the electric signal. In: Data Acquisition and Signal Processing for Smart Sensors. : Methods of frequency-to-code conversion. In: Data Acquisition and Signal Processing for Smart Sensors. , Application Note AN-276: Analog-to-digital conversion using voltageto-frequency converters. Analog Application Notes. : Digital and intelligent sensors. In: Sensors and Signal Conditioning.
The quantization error is due to the lack of synchronization of the beginning and the end of the gate time, Tx, with pulses fW. The practical time where pulse counting is done is Tx’ whose absolute value is determined by values Δt1 and Δt2. 15) Hence, Time intervals Δt1 and Δt2 can change independently of each other, varying Δt from 0 to TW. Then, as in the DCM, the maximum relative quantization error caused by the absence of synchronization is δNx ¼ Æ1 [KIR02b]. 18), the reference error term is independent of the unknown error, and it is easy to see that the error grows as the unknown frequency fx grows, and the error can be negligible for low frequencies.
In: Data Acquisition and Signal Processing for Smart Sensors. : Methods of frequency-to-code conversion. In: Data Acquisition and Signal Processing for Smart Sensors. , Application Note AN-276: Analog-to-digital conversion using voltageto-frequency converters. Analog Application Notes. : Digital and intelligent sensors. In: Sensors and Signal Conditioning. : Introduction to sensor-based measurement systems. In: Sensors and Signal Conditioning. , Application Note: V/F converter ICs handle frequency-to-voltage needs.