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Periodic signal generating device

A periodic signal and generating device technology, which is applied in the direction of pulse train generator, information storage, digital memory information, etc., can solve the problem of increased packaging cost and other issues

Inactive Publication Date: 2015-01-14
RICOH MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, although a variable delay time is achieved, it will cause an increase in packaging cost

Method used

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Examples

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no. 1 example

[0052] Figure 5 , Figure 6 , Figure 7 and Figure 8 Respectively show the schematic block diagram, the circuit diagram, the waveform diagram of the output DOUT signal and the DOUT voltage, the lower limit reference voltage of the slight oscillation, the output voltage of the voltage comparator, the output voltage of the first inverter, the output voltage of the first inverter according to the first embodiment of the present invention. Simulation waveforms of the output voltage of the second inverter and the output voltage of the third inverter changing with time respectively. Refer below Figure 5 , Figure 6 , Figure 7 and Figure 8 A first embodiment according to the present invention will be described in detail.

[0053] Such as Figure 5 As shown, in the first embodiment of the present invention, in the periodic signal generating device, the micro-oscillation reference voltage generating unit includes: a micro-oscillation lower-limit reference voltage source fo...

no. 2 example

[0062] Refer below Figure 9 , 10 , 11 and 12 to describe the second embodiment according to the present invention.

[0063] Figure 9 A schematic block diagram of a second embodiment according to the invention is shown. Figure 10 A circuit diagram according to a second embodiment of the present invention is shown. Such as Figure 9 and 10 As shown, in the second embodiment of the present invention, in the periodic signal generating device, the micro-amplitude oscillation reference voltage generation unit is a double-limited reference voltage source, which is used to generate Control output micro-oscillation lower limit reference voltage V LOWER or slightly oscillating upper limit reference voltage V UPPER . The dual-limit reference voltage source includes a resistor R1, a resistor R2, a field effect transistor N3, a resistor R3, a switch P2 of the dual-limit reference voltage source, an amplifier and a DC voltage source LDO.

[0064] In the second embodiment of the ...

no. 3 example

[0071] Figure 13 A circuit diagram according to a third embodiment of the present invention is shown. Since the difference between the third embodiment of the present invention and the second embodiment is only in the dual-limit reference voltage source, the description of other parts and working principle of the third embodiment of the present invention is omitted here.

[0072] The following reference Figure 13 The dual-limit reference voltage source of the third embodiment of the present invention will be described in detail. In this embodiment, 8051 single-chip MCU is used. The value 3.58V of the upper limit reference voltage of the slight oscillation and the value 3.52V of the lower limit reference voltage of the slight oscillation are pre-stored in the memory unit of the MCU in binary form. MCU has external interrupts INT0 and INT1, such as Figure 13 shown in . INT0 and INT1 can be set as level-triggered or jump-triggered. In this embodiment, a transition trigge...

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Abstract

The invention relates to a periodic signal generating device for outputting slight oscillation signals. The periodic signal generating device comprises a slight oscillation reference voltage generating unit, a comparator unit and a wave-shaping and time-delay unit. The slight oscillation reference voltage generating unit outputs slight oscillation lower-limit reference voltage and slight oscillation upper-limit reference voltage, and the absolute value of the difference of the slight oscillation lower-limit reference voltage and slight oscillation upper-limit reference voltage is enough small so that the slight oscillation lower-limit reference voltage and slight oscillation upper-limit reference voltage are simultaneously logic low electrical levels or logic high electrical levels. One input end of the comparator unit is connected to an output end of the slight oscillation reference voltage generating unit and the other input end of the comparator unit is connected to a slight oscillation signal. An input end of the wave-shaping and time-delay unit is connected to an output end of the comparator unit and is used for outputting a slight oscillation signal and the slight oscillation signal periodically oscillates in a range from the slight oscillation lower-limit reference voltage to the slight oscillation upper-limit reference voltage.

Description

technical field [0001] The invention relates to a periodic signal generating device for outputting a micro-amplitude oscillation signal, in particular to a periodic signal generating device applied to a delay device with adjustable delay time. Background technique [0002] For example, if figure 1 As shown, in the prior art, if the voltage jump of the DOUT pin in a chip with six pins needs to be delayed with an adjustable delay time, the traditional method is to increase the delay time by adding a pin When the capacitor is connected to the chip. This is because the oscillating signal in the delay device of the prior art is a periodic signal that changes periodically between low level and high level, that is, the oscillating signal cannot be maintained at low level or high level before the delay arrives ( The low level and high level in the present invention refer to the low level and high level in the digital logic circuit, and the low level is 0~0.25V, and the high level ...

Claims

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Application Information

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IPC IPC(8): G11C11/406
CPCH03K3/64
Inventor 黄乘黄朱莎勤
Owner RICOH MICROELECTRONICS CO LTD
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