Download e-book for kindle: Precision Instrumentation Amplifiers and Read-Out Integrated by Rong Wu

By Rong Wu

ISBN-10: 146143730X

ISBN-13: 9781461437307

ISBN-10: 1461437318

ISBN-13: 9781461437314

This booklet offers leading edge recommendations within the layout of precision instrumentation amplifier and read-out ICs, which are used to spice up millivolt-level signs transmitted by means of smooth sensors, to degrees appropriate with the enter levels of commonplace Analog-to-Digital Converters (ADCs). The dialogue comprises the speculation, layout and attention of interface electronics for bridge transducers and thermocouples. It describes using energy effective innovations to mitigate low frequency blunders, leading to interface electronics with excessive accuracy, low noise and occasional flow. considering the fact that this publication is principally approximately concepts for getting rid of low frequency blunders, it describes the character of those mistakes and the linked dynamic offset cancellation innovations used to mitigate them.

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Additional info for Precision Instrumentation Amplifiers and Read-Out Integrated Circuits

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G. a continuous-time integrator, a sample-and-hold notch filter, or a continuous-time notch filter, which will be described as follows. 1 Continuous-Time Integrator One way to implement the LPF is by using the integrator composed of Gm5, C51 and C52 to filter out the chopper ripple [21], as shown in Fig. 25. 5 Dynamic Offset Compensated Operational Amplifiers Noise PSD Noise PSD 43 Noise PSD LPF fch f (Hz) fch f (Hz) f (Hz) (a) (b) (c) Noise of chopper offsetstabilized amplifier Noise of chopped Gm3 and LPF Noise of Gm3 Fig.

4 and 5 to reduce the offset and gain error of an amplifier. Generally, the feedback concept is used in operational amplifiers to obtain an accurate gain determined by 1/b. The next few sections will review several precision operational amplifier topologies. 2 Ping-Pong Operational Amplifier As discussed before, the auto-zeroing technique is not directly suitable for use in a continuous-time general purpose amplifier, since the amplified output signal is only available during one half of the clock period.

5 kHz, which rises to 48 nV/HHz at 20 kHz. It consumes a supply current of 800 lA. 20 shows the noise spectrum of chopping, auto-zeroing and the combination of these two. As seen from Fig. 5 Dynamic Offset Compensated Operational Amplifiers 39 ping stage ch A + Vin - + - + + Va Vb1 G1 Z ch A + - + Gout Vout - - Z + G3 - Vc1 C1 C2 A G2 Z Vb2 + - A + - + - pong stage Z + G4 - Vc2 C3 C4 Fig. 19 Basic concept of the ping-pong operational amplifier Noise PSD Noise PSD fch f (Hz) f (Hz) (a) (b) No chopping or auto-zeroing Chopping Noise PSD Noise PSD ) fAZ f (Hz) fAZ fch f (Hz 2fAZ (c) (d) Auto-zeroing Chopped Auto-zeroing Fig.

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Precision Instrumentation Amplifiers and Read-Out Integrated Circuits by Rong Wu


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