Oscillation circuit
A technique of oscillating circuits and circuits, applied in power oscillators, electrical components, adjusting electrical variables, etc., can solve the problems of circuit scale enlargement and oscillation frequency change, etc., and achieve the effect of small circuit scale and small influence of temperature
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[0025]
[0026] figure 1 It is a diagram showing the oscillation circuit 100 of the first embodiment, and is composed of a constant current circuit 1, a charge and discharge circuit 2, and a control circuit 3.
[0027] The constant current circuit 1 is composed of a depletion type PMOS transistor 30 as a current source, enhancement type PMOS transistors 11 and 12 as a current mirror circuit, and an enhancement type NMOS transistor 21 as a current mirror circuit. , 22 constitute. In the depletion type PMOS transistor 30, the source and gate are connected to the first power source VDD, and the drain is connected to the source of the PMOS transistor 11. In the PMOS transistor 11, the gate is connected to the gate of the PMOS transistor 12, and the drain is connected to the drain and gate of the NMOS transistor 21. The drain of the PMOS transistor 11 is referred to as a node N1. In the PMOS transistor 12, the source is connected to the first power supply VDD, and the drain and gat...
Example
[0065]
[0066] image 3 It is a diagram showing the charge and discharge circuit 2, the control circuit 3, and the waveform shaping circuit 4 of the oscillation circuit of the second embodiment. In the second embodiment, the oscillation circuit 100 of the first embodiment is different in that the waveform shaping circuit 4 is provided, and the rest is the same as the first embodiment. The description of the same parts as the first embodiment is omitted.
[0067] The waveform shaping circuit 4 is composed of enhancement type PMOS transistors 15 and 16, enhancement type NMOS transistors 25 and 26, and inverters 51 and 52.
[0068] In the PMOS transistor 15, the source is connected to the first power supply VDD, the gate is connected to the node N2, and the drain is connected to the input of the NMOS transistor 25 and the inverter 51. In the NMOS transistor 25, the gate is connected to the node N1 of the constant current circuit, and the source is connected to the second power suppl...
Example
[0071]
[0072] Figure 4 It is a diagram showing the charge and discharge circuit 2, the control circuit 3, and the voltage boost circuit 5 of the oscillation circuit of the third embodiment. In the third embodiment, the oscillation circuit 100 of the first embodiment is different in that the voltage booster circuit 5 is provided, and the rest is the same as the first embodiment. The description of the same parts as the first embodiment is omitted.
[0073] The voltage boosting circuit 5 is composed of enhancement type PMOS transistors 17 and 18.
[0074] In the PMOS transistor 17, the source is connected to the first power source VDD, the gate is connected to the node N4, and the drain is connected to the node N2. In the PMOS transistor 18, the source is connected to the first power supply VDD, the gate is connected to the node N5, and the drain is connected to the node N3.
[0075] The operation of this embodiment will be described. After explaining the operation of the first e...
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