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Differential amplifier circuit

A differential amplifier circuit, differential amplifier technology, applied in the direction of differential amplifiers, circuits, amplifiers, etc., to achieve the effect of widening the frequency band

Pending Publication Date: 2022-08-05
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the differential amplifier circuit disclosed in Patent Document 1 has room for improvement in the frequency characteristics of the filter.

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0046] [Circuit configuration]

[0047] figure 1 It is a figure which shows 1st Embodiment of the differential amplifier circuit of this disclosure. The differential amplifier circuit 100A according to the first embodiment is, for example, a post-stage (power stage) differential amplifier circuit provided at the output of a first-stage (driver stage) amplifier circuit (not shown). like figure 1 As shown, the differential amplifier circuit 100A has amplifiers 104 , 105 , capacitors 108 , 110 , 118 , 120 , inductors 114 , 124 , and a balun 130 .

[0048] The first terminal of the capacitor 108 and the first terminal of the capacitor 118 are connected between the amplifier 104 and the balun 130 . The first terminal of the capacitor 110 and the first terminal of the capacitor 120 are connected between the amplifier 105 and the balun 130 .

[0049] The second terminal of the capacitor 108 and the second terminal of the capacitor 110 are connected. Set its connection point to n...

no. 2 Embodiment approach

[0086] [Circuit configuration]

[0087] Figure 9 It is a figure which shows 2nd Embodiment of the differential amplifier circuit of this disclosure. The differential amplifier circuit 100B of the second embodiment has a configuration in which inductors 106 , 112 , 116 , and 122 are added to the differential amplifier circuit 100A of the first embodiment. The first terminal of the inductor 106 is connected to the output of the amplifier 104 , and the second terminal is connected to the first terminal of the capacitor 108 . The first terminal of the inductor 116 is connected to the output of the amplifier 104 , and the second terminal is connected to the first terminal of the capacitor 118 . The first terminal of the inductor 112 is connected to the output of the amplifier 105 , and the second terminal is connected to the first terminal of the capacitor 110 . The first terminal of the inductor 122 is connected to the output of the amplifier 105 , and the second terminal is c...

no. 3 Embodiment approach

[0124] [Circuit configuration]

[0125] Figure 14 It is a figure which shows 3rd Embodiment of the differential amplifier circuit of this indication. The differential amplifier circuit 100C of the third embodiment has a configuration in which the inductors 106 , 112 , 114 , 116 , 122 , and 124 included in the differential amplifier circuit 100B of the second embodiment are replaced by microstrip lines and strip lines. That is, each inductor is realized by a microstrip line or a stripline. The first terminal of the inductor 106 is connected to the output of the amplifier 104 , and the second terminal is connected to the first terminal of the capacitor 108 . The first terminal of the inductor 116 is connected to the output of the amplifier 104 , and the second terminal is connected to the first terminal of the capacitor 118 . The first terminal of the inductor 112 is connected to the output of the amplifier 105 , and the second terminal is connected to the first terminal of ...

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PUM

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Abstract

Provided is a differential amplifier circuit capable of further broadening the frequency band reduced by a filter. A differential amplifier circuit (100A) is provided with: a differential amplifier that outputs a signal including higher harmonics; and a first filter and a second filter that reduce the level of even harmonics included in the output of the differential amplifier. The first filter and the second filter are connected to the output of the differential amplifier. The first filter includes a resonance circuit based on a capacitor (108) and an inductor (114), and a resonance circuit based on a capacitor (110) and an inductor (114). The second filter includes a resonance circuit based on a capacitor (118) and an inductor (124), and a resonance circuit based on a capacitor (120) and an inductor (124). The center frequency of the first filter is lower than the center frequency of the even harmonic, and the center frequency of the second filter is higher than the center frequency of the even harmonic.

Description

technical field [0001] The present invention relates to a differential amplifier circuit. Background technique [0002] Sometimes filters are installed in the differential amplifier circuit to reduce higher harmonics. For example, in the differential amplifier circuit disclosed in Patent Document 1, a filter for reducing harmonics is provided at the output of the differential amplifier. The signal with the harmonics reduced by the filter is output through the impedance matching circuit. [0003] prior art literature [0004] Patent Literature [0005] Patent Document 1: Specification of US Patent Application Publication No. 2017 / 0149394 [0006] However, the differential amplifier circuit disclosed in Patent Document 1 still has room for improvement in the frequency characteristics of the filter. SUMMARY OF THE INVENTION [0007] The problem to be solved by the invention [0008] The present disclosure has been made in view of the above-mentioned circumstances, and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/56H03H7/01
CPCH03F3/45071H03F1/565H03H7/0115H03F2200/171H03F2200/387H03H7/09H03H2007/013H03H7/1758H03H7/1791H03F2200/09H03F3/19H03F3/45475H01P3/081
Inventor 本多悠里榎本纯田中聪
Owner MURATA MFG CO LTD