Patent US6737922B2 successfully refreshed from Google Patents.
US6737922B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-way RF power amplifier circuit with increased back-off capability and power added efficiency using unequal input power division
Assignee: Cree Microwave LLC
•
Filing: 2003-05-05
•
Granted: 2004-05-18
•
Expires: 2023-05-05
Abstract
Abstract An RF power amplifier circuit for amplifying an RF signal over a broad range of power with improved efficiency includes a carrier amplifier for amplifying an RF signal over a first range of power and with a power saturation level below the maximum of the broad range of power is disclosed. One or more peak amplifiers are connected in parallel with the carrier amplifier with each of the peak amplifiers being biased to sequentially provide an amplified output signal after the carrier amplifier approaches saturation. The input signal is applied through a signal splitter to the carrier amplifier and the plurality of peak amplifiers, and an output for receiving amplified output signals from the carrier amplifier and the plurality of peak amplifiers includes a resistive load R/2. The split input signal is applied through a 90° transformer to the carrier amplifier, and the outputs of the peak amplifiers are applied through 90° transformers to a output load. When operating below saturation, the carrier amplifier delivers power to a load of 2R when the carrier amplifier delivers current to the load, which is one-half the current at maximum power and the amplifier is saturated. The signal splitter can split the input signal power equally among the carrier and one or more peak amplifiers, or the input signal can be split unequally with the carrier amplifier receiving less input power than each of the peak amplifiers and vice versa.
Inventors
- 👤 Raymond Sydney Pengelly
- 👤 Simon Maurice Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:41
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0288; H03F3/00; H03F3/68; B; B65; B65D; B65D51/00; B65D51/16; B65D51/24; H03F1/0277; H03F1/32; H03F3/60; H03F3/602; H03F2200/00; H03F2200/451; H03F2201/00; H03F2201/32; H03F2201/3203
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
150 words
An RF power amplifier circuit for amplifying an RF signal over a broad range of power comprising: a) a carrier amplifier for amplifying the RF signal over a first range of power and with a power saturation level below the maximum of the first range of power, b) a plurality of peak amplifiers connected in parallel with the carrier amplifier, each of the peak amplifiers being biased to sequentially provide an amplified output signal after the carrier amplifier approaches saturation, c) a signal splitter for splitting an input signal and applying the split input signal to the carrier amplifier and to the plurality of peak amplifiers, the input signal power to the carrier amplifier being different from the total input signal power to all of the peak amplifiers, and d) an output for receiving and combining amplified output signals from the carrier amplifier and from the plurality of peak amplifiers.
Claim 2
Dependent Claim
150 words
An RF power amplifier circuit for amplifying an RF signal over a broad range of power comprising: a) a carrier amplifier for amplifying the RF signal over a first range of power and with a power saturation level below the maximum of the first range of power, b) a plurality of peak amplifiers connected in parallel with the carrier amplifier, each of the peak amplifiers being biased to sequentially provide an amplified output signal after the carrier amplifier approaches saturation, c) a signal splitter for splitting an input signal and applying the split input signal to the carrier amplifier and to the plurality of peak amplifiers, the input signal power to the carrier amplifier being different from the total input signal power to all of the peak amplifiers, and d) an output for receiving and combining amplified output signals from the carrier amplifier and from the plurality of peak amplifiers.
Claim 3
Dependent Claim
28 words
The RF power amplifier circuit as defined by claim 1 , wherein input power to the carrier amplifier is greater than the input power to all peak amplifiers.
Claim 4
Dependent Claim
29 words
The RF power amplifier circuit as defined by claim 1 , wherein input power to the carrier amplifier is less than the total input power to all peak amplifiers.
Claim 5
Dependent Claim
25 words
The RF power amplifier circuit as defined by claim 1 , wherein each peak amplifier extends the range of efficient power amplification by 6 dB.
Claim 6
Dependent Claim
31 words
The RF power amplifier circuit as defined by claim 4 , wherein the plurality of peak amplifiers comprises three peak amplifiers and the extended efficient power amplification is approximately 18 dB.
Claim 7
Dependent Claim
55 words
The RF power amplifier circuit as defined by claim 1 , wherein the signal splitter includes a quarter-wave transformer connected to the input of the carrier amplifier, and the output includes a resistive load connected to the output of the carrier amplifier and connected to the output of each peak amplifier through a quarter-wave transformer.
Claim 8
Dependent Claim
55 words
The RF power amplifier circuit as defined by claim 1 , wherein the signal splitter includes a quarter-wave transformer connected to the output of the carrier amplifier, and the output includes a resistive load connected to the output of the carrier amplifier through the quarter-wave transformer and connected to the output of each peak amplifier.
Claim 9
Dependent Claim
34 words
The RF power amplifier circuit as defined by claim 7 , wherein the resistive load is R/2 and each amplifier is connected to the load through a quarter-wave transmission line of characteristic impedance R.
Claim 10
Dependent Claim
38 words
The RF power amplifier circuit as defined by claim 8 , wherein below saturation the carrier amplifier provides current to an apparent load of 2R whereby current is one-half of maximum power current when the amplifier is saturated.
Claim 11
Dependent Claim
39 words
The RF power amplifier circuit as defined by claim 1 , wherein the output includes a resistive load connected to the output of the carrier amplifier and connected to the output of each peak amplifier through a quarter-wave transformer.
Claim 12
Dependent Claim
39 words
The RF power amplifier circuit as defined by claim 1 , wherein the output includes a resistive load connected to the output of the carrier amplifier through a quarter-wave transformer and connected to the output of each peak amplifier.
Claim 13
Dependent Claim
34 words
The RF power amplifier circuit as defined by claim 11 , wherein the resistive load is R/2 and each amplifier is connected to the load through a quarter-wave transmission line of characteristic impedance R.
Claim 14
Dependent Claim
39 words
The RF power amplifier circuit as defined by claim 12 , wherein below saturation the carrier amplifier provides current to an apparent load of 2R whereby current is one-half of maximum power current for when the amplifier is saturated.
Claim 15
Dependent Claim
106 words
An RF power amplifier circuit for amplifying an RF signal over a broad range of power comprising: a) a carrier amplifier for amplifying the RF signal over a first range of power and with a power saturation level below the maximum of the first range of power, b) at least one peak amplifier connected in parallel with the carrier amplifier, the at least one peak amplifier being biased to begin amplification after the carrier amplifier approaches saturation, and c) a signal splitter for splitting an input signal unequally and applying the split input signal to the carrier amplifier and to the at least one peak amplifier.
Claim 16
Dependent Claim
106 words
An RF power amplifier circuit for amplifying an RF signal over a broad range of power comprising: a) a carrier amplifier for amplifying the RF signal over a first range of power and with a power saturation level below the maximum of the first range of power, b) at least one peak amplifier connected in parallel with the carrier amplifier, the at least one peak amplifier being biased to begin amplification after the carrier amplifier approaches saturation, and c) a signal splitter for splitting an input signal unequally and applying the split input signal to the carrier amplifier and to the at least one peak amplifier.
Claim 17
Dependent Claim
27 words
The RF power amplifier circuit as defined by claim 14 wherein the carrier amplifier receives less input signal power than does the at least one peak amplifier.
Claim 18
Dependent Claim
27 words
The RF power amplifier circuit as defined by claim 14 wherein the carrier amplifier receives more input signal power than does the at least one peak amplifier.
Claim 19
Dependent Claim
111 words
An RF power amplifier circuit for amplifying an RF signal over a broad range of power comprising: a) a carrier amplifier comprising a first transistor for amplifying the RF signal over a first range of power and with a power saturation level below the maximum of the broad range of power, b) at least one peak amplifier comprising a second transistor connected in parallel with the carrier amplifier, the second transistor being biased to begin amplification after the first transistor approaches saturation, and c) a signal splitter for splitting an input signal unequally and applying the split input signal to the carrier amplifier and to the at least one peak amplifier.
Claim 20
Dependent Claim
111 words
An RF power amplifier circuit for amplifying an RF signal over a broad range of power comprising: a) a carrier amplifier comprising a first transistor for amplifying the RF signal over a first range of power and with a power saturation level below the maximum of the broad range of power, b) at least one peak amplifier comprising a second transistor connected in parallel with the carrier amplifier, the second transistor being biased to begin amplification after the first transistor approaches saturation, and c) a signal splitter for splitting an input signal unequally and applying the split input signal to the carrier amplifier and to the at least one peak amplifier.
Claim 21
Dependent Claim
26 words
The RF power amplifier circuit as defined by claim 17 wherein the carrier amplifier receives less input signal than does the at least one peak amplifier.
Claim 22
Dependent Claim
21 words
The RF power amplifier circuit as defined by claim 17 wherein the first transistor differs in size from the second transistor.
Claim 23
Dependent Claim
21 words
The RF power amplifier circuit of claim 19 wherein the first transistor is smaller in size than is the second transistor.
References Cited (Backward Citations)
US3579136A
Cited
US5420541A
Cited
US5739723A
Cited
US5757229A
Cited
US5786727A
Cited
US6097252A
Cited
US5966059A
Cited
US6262629B1
Cited
US6374092B1
Cited
US6396341B1
Cited
US6445247B1
Cited
US6448616B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-05-18 | 2007-11-17 | 2008-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-05-18 | 2011-11-17 | 2012-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-05-18 | 2015-11-17 | 2016-05-18 | $7700.00 | Window Closed / Lapsed |