Piezoelectric oscillator
A technology of piezoelectric oscillators and capacitors, applied in power oscillators, electrical components, generating electric pulses, etc., can solve problems such as difficulty in miniaturization, frequency changes, and increasing the number of parts in the buffer circuit, etc., to suppress frequency changes and simplify structure effect
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no. 1 Embodiment approach
[0050] Hereinafter, the present invention will be described in detail based on illustrated embodiments. In addition, the same reference numerals are assigned to the same components as those shown in the above-mentioned conventional example, and description thereof will be omitted.
[0051] figure 1 A circuit diagram showing a crystal oscillator according to the first embodiment of the present invention. The above-mentioned crystal oscillation circuit is configured as follows: a connection circuit between the inverting amplifier INV10 and the first load impedance Z2 is inserted between the power supply Vcc and the ground GND, and a crystal oscillator X1 is inserted between the input of the above-mentioned inverting amplifier INV10 and the ground GND. A series circuit with the frequency adjustment circuit Cv of the above-mentioned quartz oscillator is inserted and connected in series with the second load impedance Z1 between the input of the above-mentioned inverting amplifier...
no. 2 Embodiment approach
[0074] figure 2 A circuit diagram showing a crystal oscillator according to a second embodiment of the present invention. The above-mentioned quartz oscillation circuit is characterized in that, in figure 1 In the crystal oscillator circuit, the above-mentioned first load impedance Z2 is replaced by a parallel circuit of an inductance L2 and a load capacitance C2. Also, for the rest of the circuit structure, due to the figure 1 are the same, so their description is omitted.
[0075] figure 2 The equivalent circuit at the start of oscillation of the crystal oscillation circuit shown can be compared with figure 1 likewise with image 3 To represent. exist image 3 In the equivalent circuit of , if the Colpitts law is applied, as mentioned above, the formulas (1), (2), and (3) are obtained. Here, according to figure 2 , since the above-mentioned second impedance Z1 is capacitive reactance C1, it can be expressed by Equation (4). In addition, at this time, the abov...
no. 3 Embodiment approach
[0089] Figure 13 A circuit diagram showing a crystal oscillator according to a third embodiment of the present invention. Figure 13 is a diagram showing a modified example of the first embodiment of the present invention, using a pair of figure 1 The oscillator circuit of the CMOS inverting amplifier is used to form the crystal oscillator. Additionally, for figure 1 Descriptions of the same parts are omitted.
[0090] exist Figure 13 Among them, the above-mentioned crystal oscillator 105 is configured as follows: between the input of the first inverting amplifier INV10 included in the first oscillating circuit 101a and the input of the second inverting amplifier INV20 included in the second oscillating circuit 101b , Insert the series circuit of the quartz vibrator X1 and the frequency adjustment circuit Cv. In addition, the first load impedance Z2a composed of the parallel circuit of the load capacitance C2a and the resistance R2a included in the above-mentioned fir...
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