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Inverting amplifier

A technology of inverting amplifiers and multi-stage amplifiers, applied in amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc.

Inactive Publication Date: 2008-01-30
SANYO ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] In addition, positive feedback occurs at the signal frequency of the two-dot chain line, and it can be seen from Fig. 3(A) that the gain also becomes 0dB or more

Method used

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  • Inverting amplifier
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Embodiment Construction

[0032] A first embodiment of the present invention will be described in detail with reference to FIG. 1 . FIG. 1 shows an inverting amplifier of this embodiment.

[0033] In FIG. 1, 100 is the first resistor connected between the input terminal 101 and the inverting input terminal 102; 103 is the second resistor connected between the output terminal 104 and the inverting input terminal 102; 105 is an operational amplifier 108 is the first transistor for amplification, the gate of the first transistor is applied with the input signal from the inverting input terminal 102, the source is grounded and the drain is connected to the resistor 109; 110 is used to amplify the first transistor 108 The 2nd transistor of output signal; 111 is the 3rd transistor that is used to amplify the output signal of the 2nd transistor 110; 112 is the internal feedback resistor that the output signal of this 3rd transistor 111 is fed back to the output part of described 1st transistor 108 .

[0034...

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PUM

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Abstract

A conventional inverting amplifier has a problem that an oscillation may be induced depending on a structure of an internal amplifier. This invention offers an inverting amplifier having a multi-stage amplifier that is provided with a first transistor that amplifies an input signal, a second transistor that amplifies an output signal of the first transistor, a third transistor that amplifies an output signal of the second transistor and an internal feedback resistor that feeds back an output signal of the third transistor to an output node of the first transistor. With the structure described above, a required gain can be set without inducing oscillation, because a gain of the multi-stage amplifier composed of three-stage transistors can be reduced.

Description

technical field [0001] The invention relates to an inverting amplifier for amplifying tiny signals, in particular to an inverting amplifier with no oscillation, small distortion and adjustable gain. Background technique [0002] Conventionally, an inverting amplifier is known. Fig. 2 shows such an inverting amplifier. An input signal from input terminal 1 of FIG. 2 is applied to an inverting input terminal (−) of operational amplifier 3 via resistor 2 . The output signal from the output terminal 4 of the operational amplifier 3 is fed back to the inverting input terminal (−) of the operational amplifier 3 via the resistor 5 . [0003] Therefore, the mixed signal of the input signal and the feedback signal is amplified by the operational amplifier 3 and then generated at the output terminal 4 . [0004] Therefore, according to the inverting amplifier of FIG. 2 , the input signal from the input terminal 1 can be amplified and obtained at the output terminal 4 . The gain (g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/02
CPCH03F2200/405H03F1/08H03F2200/75H03F1/342H03F1/34H03F1/086H03F2200/153H03F2200/408H03F1/32
Inventor 铃木达也金田安弘
Owner SANYO ELECTRIC CO LTD