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Power supply apparatus and electronic device having the same

A power supply device and a technology for outputting power, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as the existence of boundaries, achieve the effect of high speed and small amplitude, and reduce power consumption

Inactive Publication Date: 2006-10-11
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the current capability of the PMOS transistor 111 is when its gate voltage is placed at the ground potential, there is a limit

Method used

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  • Power supply apparatus and electronic device having the same
  • Power supply apparatus and electronic device having the same
  • Power supply apparatus and electronic device having the same

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Experimental program
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Embodiment Construction

[0023] Hereinafter, the present invention is described above with reference to the accompanying drawings. Figure 4 The implementation used in the electronic device shown in . figure 1 It is a circuit diagram of the power supply device 1 according to the embodiment of the present invention.

[0024] The power supply device 1 is a so-called push-pull type, and outputs an output power supply voltage, that is, a terminal power supply voltage (VTT) from a terminal power supply voltage output terminal (VTT output terminal), and outputs a reference voltage (VREF) from a reference voltage output terminal (VREF output terminal). terminal) output. It has: a reference voltage generating circuit 6 for generating a reference voltage (VREF); a first NMOS transistor 11 whose drain is connected to an input power supply (VTT_IN) and whose source is connected to a VTT output terminal; whose drain is connected to a VTT output terminal and whose source is grounded The second NMOS type transist...

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PUM

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Abstract

A power supply apparatus (1) comprises NMOS output transistors (11,12) located between an input power supply (VTT_IN) and a ground potential for supplying a power to an output terminal (VTT output terminal); a reference voltage generator circuit (6) for generating a reference voltage (VREF); and differential amplifier circuits (13,14) for comparing an output power supply voltage (VTT) fed back thereto with the reference voltage (VREF) to control the respective NMOS output transistors (11,12). The differential amplifier circuits (13,14) provides an input offset voltage between the reference voltage (VREF) supplied thereto and the output power supply voltage (VTT) so as to cause the output power supply voltage (VTT) to include a voltage range where the NMOS output transistors (11,12) both are in off states.A power supply apparatus of a low power consumption capable of supplying a sufficient current in a case of a heavy load and performing a high-speed transient response in a case of a variation of a load.

Description

technical field [0001] The present invention relates to a push-pull power supply device suitable for a high-speed storage device and an electronic device equipped with the power supply device and whose output is used as a terminal power supply. Background technique [0002] In recent years, along with the improvement of the performance of electronic equipment, the development of a storage device which seeks to increase the data transfer rate has been actively carried out. Among them, as a method of increasing the data transmission speed of a synchronous DRAM (SDRAM) that operates synchronously with a clock signal, DDR (Double Data Rate) synchronous DRAM (DDR) that synchronizes data transmission with the rising and falling edges of a clock signal -SDRAM) is being practically used. [0003] Furthermore, in DDR-SDRAM, for this high-speed data transfer, a small-amplitude interface is employed at a high speed using a termination power supply voltage and a reference voltage (for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/618G05F3/24
CPCG05F1/618G05F3/24
Inventor 酒井优
Owner ROHM CO LTD