RFC choke is placed in Colpitts oscillator instead of resistor is to provide _________(a) High impedance to DC(b) High resistance to DC(c) Low resistance to DC(d) Less bulkinessThe question was posed to me in semester exam.My question is taken from Colpitts Oscillator-1 in division Oscillators of Analog Circuits

RFC choke is placed in Colpitts oscillator instead of resistor is to p

1.	RFC choke is placed in Colpitts oscillator instead of resistor is to provide _________(a) High impedance to DC(b) High resistance to DC(c) Low resistance to DC(d) Less bulkinessThe question was posed to me in semester exam.My question is taken from Colpitts Oscillator-1 in division Oscillators of Analog Circuits
Answer» Right option is (c) Low resistance to DC For EXPLANATION: RFC choke present in Colpitts oscillator is to provide high REACTANCE to AC oscillation and low reactance to DC supply to improve performance. If resistor is USED there will be some POWER loss in DC biasing which is unnecessary.

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