Limiter circuit

A limiter circuit and limiter technology, applied in the direction of limiting the amplitude, limiting the amplitude with a diode, and limiting the amplitude of the non-control loop, etc., can solve the problems of increasing the structural components of the limiting circuit and the complicated circuit, and achieve the realization of the limiting action, simple and convenient. The effect of the circuit structure

Inactive Publication Date: 2011-05-11
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case of using the dynamic lower limit threshold signal VL, since the lower limit value of the output signal Vout fluctuates, it is necessary to eliminate the change of the lower limit value of the output signal Vout caused by the fluctuation of the lower limit threshold signal VL. The number of structural parts of the wide circuit increases and the circuit becomes complicated

Method used

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Embodiment 1

[0039] Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

[0040] figure 1 is a circuit diagram showing the clipping circuit of the first embodiment. The limiter circuit of the present invention is configured inside an IC such as an input buffer amplifier of an analog / digital converter or a signal processing circuit, for example.

[0041] Such as figure 1 As shown, the limiter circuit 1 of Embodiment 1 includes: a switch circuit 2, which controls on and off according to the magnitude relationship between the input signal Vin and the upper threshold signal VH; the lower limit threshold correction circuit 3, which will follow the switching circuit 2 is controlled by the switch and the boosted potential is corrected as the lower limit threshold signal VL; the switch circuit 4 controls on and off according to the magnitude relationship between the output of the switch circuit 2 and the lower limit threshold correctio...

Embodiment 2

[0136] Next, refer to Figure 8 with Figure 9 Embodiment 2 of the present invention will be described in detail.

[0137] Figure 8 is a circuit diagram showing the clipping circuit of Embodiment 2, Figure 9 It is an explanatory diagram for explaining the operation of the limiter circuit of the second embodiment.

[0138] Such as Figure 8 As shown, the limiter circuit 10 of Embodiment 2 includes: a switch circuit 2, which controls the turn-on and cut-off according to the magnitude relationship between the input signal Vin and the upper threshold signal VH; the lower limit threshold correction circuit 3, which generates the following The switch control of the switch circuit 2 and the boosted potential correction is the potential of the lower limit threshold signal VL; the switch circuit 4 controls the conduction and cut-off according to the magnitude relationship between the output of the switch circuit 2 and the lower limit threshold correction circuit 3; and adding Th...

Embodiment 3

[0197] Next, refer to Figure 10 with Figure 11 Embodiment 3 of the present invention will be described in detail.

[0198] Figure 10 is a circuit diagram showing the limiter circuit of Embodiment 3, Figure 11 It is an explanatory diagram for explaining the operation of the limiter circuit of the third embodiment.

[0199] The limiter circuit 20 of Embodiment 3 includes: a switch circuit 21, which controls the turn-on and cut-off according to the magnitude relationship between the input signal Vin and the lower limit threshold signal VL; a potential correction circuit 22, which is used to correct the voltage drop caused by the switch circuit 21 and the addition and subtraction circuit 23, which differentially amplifies the outputs of the switch circuit 21 and the potential correction circuit 21. The switch circuit 21 corresponds to the lower limit limiter circuit in the present invention.

[0200] The limiter circuit 20 in the third embodiment performs only the lower l...

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Abstract

A limiter circuit passes, from input signal voltages, only a signal voltage component contained in a range between the input signal voltage and the upper limit signal voltage by the switching action of a pair of transistors. In this circuit, since the pair of transistors compare the input signal voltage and a threshold signal voltage and switch lines, simultaneously, there is no influence of the propagation delay speed and no switching noise occurs when switching lines. Moreover, since no diode is used, a high-speed limiter circuit can be fabricated.

Description

technical field [0001] The invention relates to a limiter circuit for limiting the upper and lower limits of input voltage, in particular to a high-speed limiter circuit formed in a semiconductor integrated circuit. Background technique [0002] Conventionally, in semiconductor integrated circuits, for the purpose of noise component removal, circuit protection, stable operation, and analog signal processing, clipping circuits that limit the upper limit or lower limit or upper and lower limits of an input analog signal have been widely used. Figure 17 Represents an ideal diode circuit widely used as a clipping circuit. The ideal diode circuit 70 is composed of diodes D1, D2, D3, D4, differential amplifiers Q71, Q72, and resistors R71, R72. [0003] Figure 18 An example of the operation of the ideal diode circuit 70 is shown. applied as Figure 18 In the case of the input signal Vin of the waveform shown in (a), when the input signal Vin is larger than the upper threshold...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G11/00
CPCH03G11/002H03G11/02
Inventor 古宫哲夫大井淳一
Owner SHIMADZU SEISAKUSHO CO LTD
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