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Semiconductor integrated circuit

A technology of integrated circuits and semiconductors, applied in the field of semiconductor integrated circuits with reference voltage generating circuits, can solve the problems of long recovery time tr, time-consuming, long charging time, etc., and achieve the effect of reducing current consumption

Inactive Publication Date: 2004-12-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the above-mentioned conventional semiconductor integrated circuits, it takes time until the reference voltage Vr reaches the stable reference voltage Vr0 after recovery from standby, and the recovery time required from the system cannot be satisfied.
Especially in a circuit with a large reference voltage stabilizing capacitor 803, it takes a long time to charge the capacitor, and the recovery time tr is very large.

Method used

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  • Semiconductor integrated circuit
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  • Semiconductor integrated circuit

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Experimental program
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Effect test

Embodiment 1

[0040] figure 1 (a) shows the semiconductor integrated circuit of Embodiment 1 of the present invention. exist figure 1 In (a), 101 is a reference voltage generating circuit that generates a reference voltage. 102 is an analog circuit that operates using the output voltage Vr of the reference voltage generating circuit 101 . 103 is a reference voltage stabilizing capacitor for stabilizing the output voltage Vr of the reference voltage generating circuit 101 .

[0041] In the first embodiment, the output terminal of the reference voltage generating circuit 101 is input to the analog circuit 102 , and the analog circuit 102 operates using the output voltage Vr of the reference voltage generating circuit 101 . Furthermore, in order to stabilize the output voltage Vr, a reference voltage stabilizing capacitor 103 is connected between the output terminal of the reference voltage generating circuit 101 and the ground. Therefore, the standby signal Pdn is not input to the refer...

Embodiment 2

[0049] In the semiconductor integrated circuit according to Embodiment 2 of the present invention, in order to shorten the recovery time from the standby state to the normal operation state and to reduce power consumption, when the standby signal is input, the consumption current of the reference voltage generating circuit is reduced by only less than that during normal operation. desired amount.

[0050] image 3 (a) is a diagram showing a semiconductor integrated circuit related to Embodiment 2 of the present invention.

[0051] exist image 3 In (a), 201 is a reference voltage generating circuit that generates a reference voltage. 102 is an analog circuit that operates using the output voltage Vr of the reference voltage generating circuit 201 . 103 is a reference voltage stabilizing capacitor for stabilizing the output voltage Vr of the reference voltage generating circuit 201 .

[0052] Then, in the second embodiment, the output terminal of the reference voltage gener...

Embodiment 3

[0060] In the semiconductor integrated circuit according to the third embodiment of the present invention, in order to shorten the recovery time from the standby state to the normal operation state and reduce the power consumption during the standby state, N number (N is 2) are provided in the reference voltage generating circuit of the second embodiment. or a natural number above 2) parallel-connected current sources and N parallel-connected resistive loads, during standby, respectively M of the N current sources and resistive loads (M is 1 or more than 1) natural number) current source and resistive load are separated.

[0061] Figure 5 It is a diagram showing a reference voltage generating circuit of a semiconductor integrated circuit according to Embodiment 3 of the present invention.

[0062] exist Figure 5 Among them, the reference voltage generation circuit 301 is composed of N current sources IBIAS1-IBIASn, N switches SWA2-SWAn, SWB2-SWBn, and N resistance elements...

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Abstract

A semiconductor integrated circuit is provided with a reference voltage generation circuit for generating a voltage to be a reference, a function circuit that is operated using an output voltage of the reference voltage generation circuit, and a reference voltage stabilization capacitor for stabilizing the output voltage, which is connected to an output terminal of the reference voltage generation circuit. During standby, the function circuit stops operating while the reference voltage generation circuit continues operating to prevent discharging of the reference voltage stabilization capacitor, thereby realizing reduction in power consumption of the function circuit such as an analog circuit as well as high-speed recovery from the standby state to the normal operation state.

Description

technical field [0001] The present invention relates to a semiconductor integrated circuit, and more particularly to a semiconductor integrated circuit including a reference voltage generating circuit. Background technique [0002] In a system LSI in which a mixture of digital circuit modules and analog circuit modules that consume relatively large power is mounted, it is an important issue to reduce the power of the analog circuit modules. In particular, such a requirement is strong in portable devices, and it is required to reduce power consumption by timely turning on and off the power supply of the installed analog circuit module according to the usage state. For example, in a system including transmission and reception of communication, the receiving circuit is stopped during transmission, and the transmission circuit is stopped during reception. [0003] Figure 10 A block diagram of an existing semiconductor integrated circuit included in such a system is shown. 801...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/04G05F1/56G11C5/14H01L21/822H03K5/153
CPCG11C5/147
Inventor 生驹平治稲垣善嗣冈浩二
Owner PANASONIC CORP