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For accomplishing negative resistance in oscillator we use _____________(a) Voltage divider circuit(b) Negative feedback(c) Positive feedback(d) Current divider circuitThe question was posed to me in a national level competition.My query is from Introduction to Oscillator topic in portion Oscillators of Analog Circuits |
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Answer» RIGHT answer is (c) POSITIVE feedback Easiest explanation: The input or output impedance of an amplifier with positive feedback APPLIED, can be negative. When loop gain is greater than 1, the input impedance is a negative value, over a linear range. These are also called ACTIVE resistors. |
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