70MHz Paralleled Crystal Oscillator Circuit

Published:2011/6/30 4:18:00 Author:Joyce | Keyword: 70MHz , Paralleled, Crystal Oscillator | From:SeekIC

As shown in the figure is the 70MHz paralleled crystal oscillator circuit. The oscillator is mainly composed of transistor VT1, crystal SJT ,capacitance C1、 C5 and other components. Choices of components: Capacitance C1 is 20p, C2 is 100p, C3, C7 is 820p, C4 is 56p, C5, C8 is 47p, and C6 is 47u F / 50V. Inductance DLL for μ22 H (color code inductance), L2 is 0.3 μH. Resistance R1 is 1.6 kΩ ,R2 is 1kΩ, R3 is 750Ω and R4 is 180Ω,1W, R5 is 1.3 Ω , R6 is 3kΩ ,R7 is 360Ω, R8 is 470 Ω, R9 ~ R12 is 300Ω, 2W . Choices for transistor VT1, VT2 could be 3DG828 ,65≤β≤115. Crystal SJT could use model JA98-70MHz. Relays KM is JUC - 1M.



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