By Robert J. Matthys
A brand new harmonic oscillator circuit (which is the simplest in its category) and a brand new bridge oscillator circuit were extra to this version; either circuits are of exceptional functionality. This functional treatise additionally areas every kind of oscillator circuits in a standard framework to provide an explanation for their layout and study their functionality. real operating circuits are given for all of the simple kinds, and comparisons are made among them. the whole frequency diversity is roofed, from 1 kHz to a hundred mHz.
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Extra info for Crystal Oscillator Circuits
Second, the TTL version cannot be used above about 3 MHz because TTL voltage levels exceed the crystal’s power dissipation limit. And third, the circuit will not oscillate below about 100 kHz because the parallel resistance of the first TTL inverter’s input resistance and the biasing resistor Rblas act as a voltage divider with the crystal’s internal series resistance R, and attenuate loop gain too much. Although Fig. 16 shows a crystal load resistor Rload, both RIoad and capacitor C r are frequently omitted from the circuit, which reduces both the in-circuit Q and short-term frequency stability.
7b should be to oscillate at that same frequency. As an example, Fig. 10 shows a fundamental Colpitts circuit for 20 MHz. 11 shows a third harmonic Colpitts circuit also for 20 MHz. LH inductor& is approximately equal to RI, 1200 Sz. The reason the circuit in Fig. 7 MHz is only 400 R or l/s of what it should be for fundamental oscillation. 10. 20 MHz. 11. at 20 MHz. 4. LOW CAPACITANCE LOAD What happens when a low capacitance load (high impedance) is used on the crystal? The major effects are a higher oscillation frequency and a higher crystal output signal to the amplifier.
The crystal typically operates inductively, about 5-40 ppm above series resonance, because the actual phase lag of R,C, is significantly less than 90”. There is a close correlation in the Pierce between the circuit’s short‘term frequency stability and the crystal’s internal series resistance R,. The lower the crystal’s resistance at series resonance, the smaller the frequency shift needed to change the crystal’s impedance from capacitive to inductive (or vice versa) and correct any phase errors around the loop.
Crystal Oscillator Circuits by Robert J. Matthys