Low-noise amplifier having high linearity for multi-band
US-2016373065-A1 · Dec 22, 2016 · US
Feedback amplifier
US2025055426A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2025055426-A1 |
| Application number | US-202418927661-A |
| Country | US |
| Kind code | A1 |
| Filing date | Oct 25, 2024 |
| Priority date | Jun 17, 2022 |
| Publication date | Feb 13, 2025 |
| Grant date | — |
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Abstract
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Disclosed is a feedback amplifier including: an amplification transistor having a source terminal grounded; a first feedback circuit to provide negative feedback between the gate and drain terminals of the amplification transistor; a second feedback circuit to provide positive feedback between the gate and drain terminals via the first feedback circuit; and a third feedback circuit to adjust the stability factor of the feedback amplifier in a high frequency range outside a used frequency band.
First claim
Opening claim text (preview).
What is claimed is: 1 . A feedback amplifier comprising: an amplification transistor which has a control terminal connected to an input terminal, and has a first terminal and a second terminal, and in which conductance of the first and second terminals is controlled by a control signal inputted to the control terminal, and the first terminal is grounded; a first feedback circuit to provide negative feedback between the control and second terminals of the amplification transistor; a second feedback circuit provided between an output terminal and the second terminal of the amplification transistor, and connected in series to the first feedback circuit, to provide, via the first feedback circuit, positive feedback between the control and second terminals of the amplification transistor; and a third feedback circuit connected in series to the first feedback circuit and connected in parallel to the second feedback circuit, to adjust a stability factor of the feedback amplifier in a high frequency range outside a used frequency band, wherein an absolute value of an impedance in the third feedback circuit decreases as a frequency of an input signal becomes higher. 2 . The feedback amplifier according to claim 1 , wherein the first feedback circuit includes an element having a resistive property. 3 . The feedback amplifier according to claim 2 , wherein the first feedback circuit is a series circuit in which a resistor and a capacitor are connected in series. 4 . The feedback amplifier according to claim 3 , wherein the third feedback circuit includes an element having a resistive property. 5 . The feedback amplifier according to claim 4 , wherein the second feedback circuit includes an element having a reactive property. 6 . The feedback amplifier according to claim 5 , wherein the absolute value of the impedance in the third feedback circuit is greater than that of an impedance in the second feedback circuit, and a difference between the absolute values of both the impedances becomes smaller as the frequency of the input signal becomes higher. 7 . The feedback amplifier according to claim 6 , wherein the second feedback circuit is an inductor connected in series between the second terminal of the amplification transistor and the output terminal, and the absolute value of the impedance in the second feedback circuit increases as the frequency of the input signal becomes higher. 8 . The feedback amplifier according to claim 1 , wherein the second feedback circuit is an inductor connected in series between the second terminal of the amplification transistor and the output terminal, and the second feedback circuit resonates in series with output capacitance in a high frequency range within the used frequency band. 9 . The feedback amplifier according to claim 1 , further comprising one or more transistors each of which has a control terminal grounded via a capacitor and connected via a resistor to a power supply, and has a first terminal and a second terminal, and in each of which conductance of the first and second terminals is controlled by a control signal inputted to the control terminal, wherein the one or more transistors are connected in series to the amplification transistor and the second terminal of the amplification transistor is connected via the one or more transistors to the second feedback circuit.
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Classifications
the loading circuit of an amplifying stage being a series resonance circuit · CPC title
the feedback circuit comprising a parallel resonance circuit · CPC title
A parallel resonance being added in shunt in the output circuit, e.g. base, gate, of an amplifier stage · CPC title
A coil being coupled in a feedback path of an amplifier stage · CPC title
the feedback circuit of the amplifier stage comprising a passive resistor and passive capacitor · CPC title
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- What does patent US2025055426A1 cover?
- Disclosed is a feedback amplifier including: an amplification transistor having a source terminal grounded; a first feedback circuit to provide negative feedback between the gate and drain terminals of the amplification transistor; a second feedback circuit to provide positive feedback between the gate and drain terminals via the first feedback circuit; and a third feedback circuit to adjust th…
- Who is the assignee on this patent?
- Mitsubishi Electric Corp
- What technology area does this patent fall under?
- Primary CPC classification H03F1/342. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Feb 13 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).