Common-mode bootstrapping techniques have been used to produce high CMRR second g e n e r a t i o n c u r r e n t -m o d e i n s t r u m e n t a t i o n amplifiers.Simulation results, which take component mismatch into account show CMRR performance better than 7OdBs at lOOkHz for unity differential gain.
Abstract. The current-mode instrumentation amplifier (CMIA) based on op-amp power-supply current sensing offers distinct advantages over conventional architecture designs, The CMIA is studied in detail and the CMRR expression is derived in terms of op-amp and transistor parameters. A good CMRR is shown to depend upon several factors, including the power-supply rejection ratio of the op-amps used in the CMIA. The results obtained are shown to compare well with SPICE simulation and provide valuable design insight for development of the next generation of CMIAs.
A novel design technique for a high-speed, highaccuracy voltage-follower is presented. The design is based on a floating negative-feedback technique which results in the commonly encountered trade-off between speed and accuracy being released. Details of the design principles are explained and a practical design example is described which is shown to exhibit simultaneously very high speed and very high accuracy.
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