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High CMRR Instrumentation Amplifier (Schematic and Layout) design for biomedical applications

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Instrumentation amplifiers are intended to be used whenever acquisition of a useful signal is difficult. IA’s must have extremely high input impedances because source impedances may be high and/or unbalanced. bias and offset currents are low and relatively stable so that the source impedance need not be constant. Balanced differential inputs are provided so that the signal source may be referenced to any reasonable level independent of the IA output load reference. Common mode rejection, a measure of input balance, is very high so that noise pickup and ground drops, characteristic of remote sensor applications, are minimized.Care is taken to provide high, well characterized stability of critical parameters under varying conditions, such as changing temperatures and supply voltages. Finally, all components that are critical to the performance of the IA are internal to the device. The precision of an IA is provided at the expense of flexibility. By committing to the one specific task of
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1000-1 Tuning Voltage-Controlled Filter Circuit Diagram

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This is the 1000-1 Tuning Voltage-Controlled Filter Circuit Diagram. A standard dual integrator filter can be constructed using a few CA3080s. By varying LABC, the resonant frequency can be swept over a 1000:1 range. At IC1, three are current-controlled integrators. At IC2, four are voltage followers that serve to buffer the high-impedance outputs of the integrators. A third CA3080 (IC5) is used to control the Q factor of the filter. The resonant frequency of the filter is linearly proportional to /abc· Hence, this unit is very useful in producing electronic music. Two outputs are produced: a low-pass and a bandpass response. 

 1000:1 Tuning Voltage-Controlled Filter Circuit Diagram


1000:1 Tuning Voltage-Controlled Filter Circuit Diagram

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