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CSTCR4M00G53-R0 Datasheet(PDF) 11 Page - Murata Manufacturing Co., Ltd. |
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CSTCR4M00G53-R0 Datasheet(HTML) 11 Page - Murata Manufacturing Co., Ltd. |
11 / 32 page 9 Note • Please read rating and CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please review our product specifications or consult the approval sheet for product specifications before ordering. 2 Principles of CERALOCK® 2 2. Basic Oscillation Circuits Generally, basic oscillation circuits can be grouped into the following 3 categories. ① Use of positive feedback ② Use of negative resistance element ③ Use of delay in transfer time or phase In the case of ceramic resonators, quartz crystal oscillators, and LC oscillators, positive feedback is the circuit of choice. Among the positive feedback oscillation circuit using an LC, the tuning type anti-coupling oscillation circuit, Colpitts and Hartley circuits are typically used. See Fig. 2-6. In Fig. 2-6, a transistor, which is the most basic amplifier, is used. The oscillation frequencies are approximately the same as the resonance frequency of the circuit consisting of L, CL1 and CL2 in the Colpitts circuit or consisting of L1 and L2 in the Hartley circuit. These frequencies can be represented by the following formulas. (Refer to Note 3 on page 11.) In an LC network, the inductor is replaced by a ceramic resonator, taking advantage of the fact that the resonator becomes inductive between resonant and anti- resonant frequencies. This is most commonly used in the Colpitts circuit. The operating principle of these oscillation circuits can be seen in Fig. 2-7. Oscillation occurs when the following conditions are satisfied. Loop Gain G = α・β ≧ 1 Phase Amount (2-6) θ = θ 1 + θ 2 = 360°×n (n = 1, 2,…) In Colpitts circuit, an inverter of θ 1 = 180° is used, and it is inverted more than θ 2 = 180° with L and C in the feedback circuit. The operation with a ceramic resonator can be considered the same. CL1 CL2 L L1 L2 C fosc. = (Hartley Circuit) 1 fosc. = (Colpitts Circuit) 1 CL1 · CL2 CL1 + CL2 (2-4) (2-5) Fig. 2-6 Basic Configuration of LC Oscillation Circuit Amplifier 1 Feedback Circuit Feedback Ratio : Phase Shift : 2 Fig. 2-7 Principle of Oscillation Colpitts Circuit Hartley Circuit Oscillation Conditions Loop Gain G= α·β ≧ 1 Phase Shift θ = θ1+ θ2=360°×n P17E.pdf 2012.10.31 |
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