Patent EP0134545A1 successfully refreshed from Google Patents.
Patent US20040113698A1 successfully refreshed from Google Patents.
US20040113698A1
Expired / Lapsed
US
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Signal amplifier using a doherty amplifier
Assignee: Pohang University of Science and Technology Foundation
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Filing: 2003-07-15
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Granted: —
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Expires: 2023-07-15
Abstract
Abstract A signal amplifier includes a splitter for splitting an input signal into first and second signals, first and second bias control networks for generating a base bias signal for a Doherty amplifier in accordance with a power level of the input signal, a carrier amplifier for amplifying the first input signal, a peaking amplifier for amplifying the second input signal and a Doherty output network for combining the amplified signals. Through a simplified transformation of characteristic impedances in the Doherty output network, minimization of circuitry including the signal amplifier is obtained. Further, by controlling the Doherty amplifier in accordance with the power level of the input signal, both high efficiency and high linearity of the signal amplifier are achieved.
Inventors
- 👤 Bumman Kim
- 👤 Youngoo Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:24
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0288; H03F3/00; H03F3/60; H03F3/602
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
156 words
1 . A signal amplifier comprising: a splitter for splitting an input signal into two signals to be transmitted respectively through a first and a second transmission paths; a first and a second bias control networks for generating base bias signals corresponding to a power level of the input signal by alternating their operation modes, wherein the power level of the input signal lower than a predetermined threshold level is associated with a low input power drive mode and the power level of the input signal higher than the predetermined threshold level is associated with a high input power drive mode of the control networks; a Doherty amplifier including a carrier amplifier for amplifying the signal transmitted through the first transmission path and a peaking amplifier for amplifying the signal transmitted through the second transmission path; and a Doherty output network for matching and outputting the signals amplified at the carrier amplifier and the peaking amplifier.
Claim 2
Dependent Claim
156 words
1 . A signal amplifier comprising: a splitter for splitting an input signal into two signals to be transmitted respectively through a first and a second transmission paths; a first and a second bias control networks for generating base bias signals corresponding to a power level of the input signal by alternating their operation modes, wherein the power level of the input signal lower than a predetermined threshold level is associated with a low input power drive mode and the power level of the input signal higher than the predetermined threshold level is associated with a high input power drive mode of the control networks; a Doherty amplifier including a carrier amplifier for amplifying the signal transmitted through the first transmission path and a peaking amplifier for amplifying the signal transmitted through the second transmission path; and a Doherty output network for matching and outputting the signals amplified at the carrier amplifier and the peaking amplifier.
Claim 3
Dependent Claim
91 words
2 . The signal amplifier of claim 1 , wherein the carrier amplifier reduces idle current in the low input power drive mode and functions as a class AB amplifier in the high input power drive mode in accordance with the bias signal transmitted from the first bias control network; and the peaking amplifier is turned off in the low input power drive mode and functions as a class AB amplifier in the high input power drive mode in accordance with the bias signal transmitted from the second bias control network.
Claim 4
Dependent Claim
115 words
3 . The signal amplifier of claim 1 , wherein the first bias control network includes a V contC pin for receiving different control voltages depending on the power level of the input signal and a V refC pin for transmitting the different base bias signal to the carrier amplifier in accordance with the control voltage fed to the V contC pin; and the second bias control network includes a V contP pin for receiving different control voltages depending on the power level of the input signal and a V refP pin for transmitting the different base bias signal to the peaking amplifier in accordance with the control voltage fed to the V contP pin.
Claim 5
Dependent Claim
28 words
4 . The signal amplifier of claim 3 , wherein the control voltages fed to the V contC pin is equal to that of the V contP pin.
Claim 6
Dependent Claim
43 words
5 . The signal amplifier of claim 4 , wherein the V contC pin and the V contP pin are fed with about 2˜3 V in the low input power drive mode and about 0 V in the high input power drive mode.
Claim 7
Dependent Claim
49 words
6 . The signal amplifier of claim 1 , further comprising an attenuator for compensating a gain difference between the first and the second transmission paths in the high input power drive mode, which is located at one of input ends of the carrier amplifier and the peaking amplifier.
Claim 8
Dependent Claim
23 words
7 . The signal amplifier of claim 6 , wherein the attenuator is implemented by using passive elements or variable gain amplifiers (VGAs).
Claim 9
Dependent Claim
31 words
8 . The signal amplifier of claim 1 , further comprising a first transmission line for compensating a delay and a phase differences between the first and the second transmission paths.
Claim 10
Dependent Claim
20 words
9 . The signal amplifier of claim 8 , wherein the first transmission line is implemented by using lumped elements.
Claim 11
Dependent Claim
86 words
10 . The signal amplifier of claim 1 , wherein the Doherty output network includes: a second transmission line having characteristic impedance R oc and phase Θ c , which is arranged at an output end of the carrier amplifier; a third transmission line having characteristic impedance R op and phase Θ p , which is arranged at an output end of the peaking amplifier; and a fourth transmission line having characteristic impedance R oc and phase 90°, which is coupled with the second transmission line.
Claim 12
Dependent Claim
23 words
11 . The signal amplifier 10 , wherein the second, the third and the fourth transmission lines are implemented by using lumped elements.
Claim 13
Dependent Claim
23 words
11 . The signal amplifier 10 , wherein the second, the third and the fourth transmission lines are implemented by using lumped elements.
Claim 14
Dependent Claim
38 words
12 . The signal amplifier of claim 10 , wherein the characteristic impedance R op is adjusted in accordance with the formula of Rop=50·(1+α), where α is a size ratio of the peaking amplifier to the carrier amplifier.
Claim 15
Dependent Claim
52 words
13 . The signal amplifier of claim 10 , wherein the characteristic impedance R oc is adjusted in accordance with the formula of R o c = 50 · 1 + α α , where α is a size ratio of the peaking amplifier to the carrier amplifier.
References Cited (Backward Citations)
US5757229A
Cited
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