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Amplifier with gain in direct proportion to power voltage

A power supply voltage and amplifier technology, applied in the field of angular velocity sensor devices, can solve the problems of not being able to correctly track the change of power supply voltage Vdd

Inactive Publication Date: 2004-07-21
コラボイノベーションズインコーポレイテッド
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the output voltage Vout cannot accurately track the fluctuation of the power supply voltage Vdd

Method used

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  • Amplifier with gain in direct proportion to power voltage
  • Amplifier with gain in direct proportion to power voltage
  • Amplifier with gain in direct proportion to power voltage

Examples

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no. 1 Embodiment

[0050] Refer below Figure 1 to Figure 3 The power supply voltage proportional amplifier of the first embodiment of the present invention will be described.

[0051] exist figure 1 Among them, the power supply voltage proportional amplifier of the first embodiment includes an amplifying circuit 20a for amplifying and outputting an input signal, a bias circuit 11 as a first voltage source, a constant voltage source 12 as a third voltage source, and a circuit as a second voltage source. Bias circuit 14. The bias circuit 11 outputs a positive voltage obtained by dividing the power supply voltage Vdd to the output terminal 11a. In the amplifier circuit 20a, the input terminal 51 is connected to the drain of a first MOS type field effect transistor (hereinafter abbreviated as MOS-FET) 21 of the P-channel via a capacitor 9 for blocking direct current. When the input signal applied to the input terminal 51 does not contain a DC component, the input signal may be input to the inpu...

no. 2 Embodiment

[0109] Refer below Figure 4 A power supply voltage proportional amplifier according to a second embodiment of the present invention will be described. P-channel MOS-FETs 21, 22, and 23 are used in the power supply voltage proportional amplifier of the first embodiment, but the power supply voltage proportional amplifier of the second embodiment is constructed using N-channel MOS-FETs.

[0110] Such as Figure 4 As shown, in the N-channel MOS-FETs 24, 25, and 26, the gate of the MOS-FET 24 functioning as an input resistor is connected to the power supply VDD. The positive terminal of the constant voltage source 12 (third voltage source) is connected to the gate of the MOS-FET 25 . In the bias circuit 14 a (second voltage source), the source terminal 84 of the MOS-FET 26 is connected to the circuit ground Gr via the constant current source 13 . The output terminal 14g of the bias circuit 14a is connected to the connection point of the above-mentioned source terminal 84 and t...

no. 3 Embodiment

[0116] Next, a power supply voltage proportional amplifier according to a third embodiment of the present invention will be described with reference to the circuit diagram of FIG. 7 . In FIG. 7, since the constant voltage source 12, bias circuits 11 and 14 and figure 1 The cases shown are the same, so repeated explanations are omitted. The amplifying circuit 20d includes: the inverting input terminal (-) is connected to the input terminal 51 through the capacitor 9, and the non-inverting input terminal (+) is connected to the first operational amplifier 64 of the output terminal 14f of the bias circuit 14; and the output terminal is connected to the amplifying circuit The second operational amplifier 65 of the output terminal 52 of 20d. A resistor 46 is connected between the inverting input terminal (−) of the second operational amplifier 65 and the output terminal 52 . The sources of the two P-channel MOS-FETs 31 and 32 are connected in common, and the source 76 thereof is...

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Abstract

In order that an amplifier with a gain proportional to source voltage is obtained, the drain-source voltages of first and second P-channel MOS-FETs are zero-biased, and a voltage shifted higher by the amount of the threshold voltage of the P-channel MOS-FET on the basis of a voltage obtained by dividing the power source voltage by resistors is applied to the positive input terminal of an operational amplifier. The gate of one of the first and second MOS-FETs is connected to a circuit ground, and a negative fixed voltage with reference to the potential obtained by dividing the power source voltage by resistors is applied to the gate of the other MOS-FET. The ON resistances of the two MOS-FETs are used as the input resistor and the feedback resistor of the operational amplifier, respectively.

Description

technical field [0001] The present invention relates to an amplifier whose gain varies with a power supply voltage, and more particularly to an angular velocity sensor device using such an amplifier. Background technique [0002] Various amplifiers such as DC amplifiers and high-frequency amplifiers are used in electronic equipment, and it is common for these amplifiers to stabilize and keep the voltage of their DC power supply constant. In general, stable characteristics can be obtained by keeping the voltage of the power supply constant. [0003] However, in electronic devices mounted on mobile bodies such as automobiles and used under severe environmental conditions, there is a problem that the stable power supply voltage fluctuates due to load fluctuations and external noise. In automobiles today, many sensors are used in devices for body control and safety such as attitude control systems and anti-lock braking systems (ABS). The output signals of these sensors are mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/00
CPCH03G3/007
Inventor 佐藤政晴石田琢磨小林拓
Owner コラボイノベーションズインコーポレイテッド
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