US7130595B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitter power amplifier ramping method
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1999-12-22
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Granted: 2006-10-31
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Expires: 2019-12-22
Abstract
Abstract A method for reducing frequency glitches in a digital transceiver due to power amplifier input impedance variations. According to the method, the power amplifier is switched on after the end of a prior packet reception period and before a new packet transmission begins. Instead of ramping the power amplifier gain, the method ramps the modulation signals. As a consequence, any VCO frequency transients that may result from turning on the power amplifier have an opportunity to decay before the new packet transmission is initiated. This technique effectively isolates the transmitter power amplifier from the frequency synthesizer VCO to facilitate fast switching transceiver operation.
Inventors
- 👤 Rishi Mohindra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:12
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H03G3/3047
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
In a transceiver having a power amplifier and a pair of up-converter mixers, an improved power ramping method comprising: switching on the power amplifier after an end of a prior packet reception period and prior to a start of a new packet transmission; and ramping modulation signals supplied to the up-converter mixers upon initiation of a new packet transmission, wherein the modulation signals are in-phase and quadrature-phase signals and wherein the modulation signals are ramped by monotonically scaling a set of digital words representing the in-phase and quadrature-phase signals.
Claim 2
Dependent Claim
89 words
In a transceiver having a power amplifier and a pair of up-converter mixers, an improved power ramping method comprising: switching on the power amplifier after an end of a prior packet reception period and prior to a start of a new packet transmission; and ramping modulation signals supplied to the up-converter mixers upon initiation of a new packet transmission, wherein the modulation signals are in-phase and quadrature-phase signals and wherein the modulation signals are ramped by monotonically scaling a set of digital words representing the in-phase and quadrature-phase signals.
Claim 3
Dependent Claim
32 words
The method as described in claim 1 further including the step of delaying initiation of the new packet transmission for a given time following the end of the prior packet reception period.
Claim 4
Dependent Claim
18 words
The method as described in claim 1 wherein initiation of the new packet transmission begins with a preamble.
Claim 5
Dependent Claim
17 words
The method as described in claim 1 wherein the ramping step occurs over a given time period.
Claim 6
Dependent Claim
91 words
A power ramping method operative in a transmitter having a power amplifier, comprising: turning off the power amplifier upon initiation of a packet reception; upon completion of the packet reception and prior to a start of a new packet transmission, turning on the power amplifier; and ramping modulation signals supplied to the power amplifier upon initiation of said new packet transmission, wherein the modulation signals are in-phase and quadrature-phase signals and wherein the modulation signals are ramped by monotonically scaling a set of digital words representing the in-phase and quadrature-phase signals.
Claim 7
Dependent Claim
91 words
A power ramping method operative in a transmitter having a power amplifier, comprising: turning off the power amplifier upon initiation of a packet reception; upon completion of the packet reception and prior to a start of a new packet transmission, turning on the power amplifier; and ramping modulation signals supplied to the power amplifier upon initiation of said new packet transmission, wherein the modulation signals are in-phase and quadrature-phase signals and wherein the modulation signals are ramped by monotonically scaling a set of digital words representing the in-phase and quadrature-phase signals.
Claim 8
Dependent Claim
20 words
The power ramping method as described in claim 5 wherein initiation of the new packet transmission begins with a preamble.
Claim 9
Dependent Claim
91 words
In a spread spectrum transceiver having a power amplifier and a pair of up-converter mixers, an improved power ramping method comprising: switching on the power amplifier after an end of a prior packet reception period and prior to a start of a new packet transmission; and ramping modulation signals supplied to the up-converter mixers upon initiation of a new packet transmission, wherein the modulation signals are in-phase and quadrature-phase signals and wherein the modulation signals are ramped by monotonically scaling a set of digital words representing the in-phase and quadrature-phase signals.
Claim 10
Dependent Claim
91 words
In a spread spectrum transceiver having a power amplifier and a pair of up-converter mixers, an improved power ramping method comprising: switching on the power amplifier after an end of a prior packet reception period and prior to a start of a new packet transmission; and ramping modulation signals supplied to the up-converter mixers upon initiation of a new packet transmission, wherein the modulation signals are in-phase and quadrature-phase signals and wherein the modulation signals are ramped by monotonically scaling a set of digital words representing the in-phase and quadrature-phase signals.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2009-10-30 | 2010-05-01 | 2010-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2013-10-30 | 2014-05-01 | 2014-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2017-10-30 | 2018-05-01 | 2018-10-31 | $7700.00 | Window Closed / Lapsed |