Effects of Negative Feedback in Amplifiers: Decibels of Feedback – Effects of Negative Feedback in Amplifiers can be measured in decibels. A statement that 40 dB of feedback has been applied to an amplifier means that the amplifier gain has been reduced by 40 dB, (that is, by a factor of 100). Thus, Bandwidth: Consider […]
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Parallel Current Negative Feedback Circuit: Current Feedback Circuit – In series-voltage feedback, a portion of the output voltage is fed back in series with the signal source. In Parallel Current Negative Feedback Circuit, a portion of the output current is fed back in parallel with the signal source. Just as series voltage feedback stabilizes the
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Emitter Current Feedback Circuit: Emitter Current Feedback Circuit is produced by connecting an unbypassed resistor in series with the emitter terminal of a transistor, as shown in Fig. 13-24(a). The effects of an unbypassed emitter resistor in a CE circuit have been analyzed already, where it is shown that the circuit impedance and voltage gains
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Two Stage Differential Amplifier with Negative Feedback: The circuit shown in Fig. 13-20 has a Two Stage Differential Amplifier with Negative Feedback with npn BJTs, and a direct-coupled pnp transistor differential amplifier second stage. The circuit uses a plus/minus supply voltage, and the base terminals of Q1 and Q2 are biased to ground via resistors
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Two Stage Direct Coupled BJT Amplifier Circuit: The Two Stage Direct Coupled BJT Amplifier Circuit in Fig. 13-17 is reproduced from Fig. 12-22, and modified to include feedback components RF1 and RF2. Other direct-coupled circuits can be converted into negative feedback amplifiers by following the same procedure. Similarly, BIFET circuits, both Two Stage Direct Coupled BJT Amplifier
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Two Stage CE Amplifier using Series Voltage Negative Feedback: Negative Feedback Amplifier Circuit – A two-stage, capacitor-coupled BJT amplifier is shown in Fig. 13-10. This is the same Two Stage CE Amplifier circuit discussed already with the addition of feedback components RF2, RF1, and CF1. The output voltage is divided across RF2 and RF1 to produce a feedback
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Voltage Series Negative Feedback Amplifier: In a negative feedback amplifier, a small portion of the output voltage is fed back to the input. When the feedback voltage is applied in series with the signal voltage, the arrangement is Voltage Series Negative Feedback Amplifier. The instantaneous polarity of the feedback voltage is normally opposite to the
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