100_MHz_VHF_CRYSTAL_OSCILLATOR

Published:2009/7/7 7:53:00 Author:May | From:SeekIC

Figure 21-13 shows a 100-MHz oscillator operating on the fifth harmonic. Again to maintain the transistor's gain, note the increase in the collector's load resistance R1 because of the increase in the quartz crystal's internal series resistance Rs. C3 is needed at frequencies above 50 MHz to tune out the shunting effect of L1 on R1, to maintain a high load resistance for the transistor and get enough gain for oscillation.The equivalent series RLCL load across the crystal is 8.2 Ω (RL) and 200 pF (CL).



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