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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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Fm Narrow Band Transmitter 27MHz

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NBFM or Attenuated Bandage Frequncy Modulation is acclimated in this 27 MHz fm transmitter circuit schematic. This circuit is an appliance by Motorola MC2833 – VHF transmitter with FM accentuation and attenuated bandage in a distinct chip. The achievement ability is 10mW (+10 dBm) and the advantage is 10 – 20m.

P1 is acclimated to acclimatize microphone addition and P2 to acclimatize the deviation. Remember that this 27MHz fm transmitter use NBFM with best 5KHz deviation, this beggarly you accept to use an nbfm receiver to access abundant audio level.
The transmitter is accessible to adjust: trim C9, C9 and C18 for best achievement ability on a bogus 50Ω load. Then accept on a 27MHz radio receiver and acclimatize P1 and P2 untill you access the best modulation. X1 = 27.005 MHz quartz

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