Oscillators Objectives Part 03
41 . When L is doubled and C is halved, the frequency is unchanged.
42 . Positive feedback is the same as Regeneration.
43 . An oscillator that uses a tapped coil in the LC tuned circuit is the Hartley Oscillator
44 . The input to the phase comparator is 5kHz
46 . When the VCO is operating at 16.400 MHz what divisor is needed to get 5 KHz is 3280
47 . One of the synthesized output frequency is 26.975MHz.
48 . The frequency division for the crystal oscillator is 1/2119.
49 . If C be the capacitance, then frequency of oscillations in case of Wein bridge oscillator is proportional to 1/C.
50 . Oscillators have positive feedback.
51 . The frequency of a tuned RF feedback oscillator with 240 pH fprLand 180 PF force is 765.7KHz.
52 . L is needed with a C of 20 PF for an oscillatory frequency of 110.7 MHz is 0.1uH.
53 . The crystal oscillator frequency is very stable due to High Q of the Crystal.
54 . Parasidc oscillations are unwanted oscillations created due to stray capacitances and inductances.
55 . A crystal oscillator is used because the frequency of oscillations remains substantially constant.
56 . Surface Acoustic wave oscillators are suitable for I-C applications.
57 . The value of L needed with C of 20 PF for an oscillator frequency of 110.7 MHz is 0.1uH
58 . A tuned circuit used in Colpitts oscillator is shown in Fig.22. The frequency of oscillations will be 100MHz
59 . A Wein bridge oscillator has Rt=R = 220kQ and Ci = 250 pF. frequency of oscillations will be nearly 2.89KHz
60 . Spot the odd one out Stellite
