Read e-book online Practical Design Techniques for Sensor Signal Conditioning PDF


By Walt Kester

ISBN-10: 0916550206

ISBN-13: 9780916550202

Analog units Seminar e-book for sensible layout suggestions for Sensor sign Conditioning

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Open loop gains greater than 1 million are common, along with common mode and power supply rejection ratios of the same magnitude. , external passive component selection and PC board layout. It is important to understand that DC open-loop gain, offset voltage, power supply rejection (PSR), and common mode rejection (CMR) alone should not be the only considerations in selecting precision amplifiers. The AC performance of the amplifier is also important, even at "low" frequencies. Open-loop gain, PSR, and CMR all have relatively low corner frequencies, and therefore what may be considered "low" frequency may actually fall above these corner frequencies, increasing errors above the value predicted solely by the DC parameters.

1 AMPLIFIERS FOR SIGNAL CONDITIONING In this section, we will first look at some key performance specifications for precision op amps. Other amplifiers will then be examined such as instrumentation amplifiers, chopper amplifiers, and isolation amplifiers. The implications of single supply operation will be discussed in detail because of their significance in today's designs, which often operate from batteries or other low power sources. AMPLIFIERS FOR SIGNAL CONDITIONING n Input Offset Voltage <100µV n Input Offset Voltage Drift <1µV/°C n Input Bias Current <2nA n Input Offset Current <2nA n DC Open Loop Gain >1,000,000 n Unity Gain Bandwidth Product, fu 500kHz - 5MHz n Always Check Open Loop Gain at Signal Frequency!

808Ω. 44mV in the bridge output. 39mV from no strain). 26% fullscale. Note that these errors are produced solely by the 30 gage wire, and do not include any temperature coefficient errors in the strain gage itself. 14. We assume that the bridge output voltage is measured by a high impedance device, therefore there is no current in the sense lead. Note that the sense lead measures the voltage output of a divider: the top half is the bridge resistor plus the lead resistance, and the bottom half is strain gage resistance plus the lead resistance.

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Practical Design Techniques for Sensor Signal Conditioning by Walt Kester

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