Title:
TRANSMITTER ARCHITECTURES FOR COMMUNICATIONS SYSTEMS
Document Type and Number:
WIPO Patent Application WO2001067621
Kind Code:
A3
Abstract:
Transmitter architectures for a communications system having improved performance over conventional transmitter architectures. The improvements include a combination of the following: faster response time for the control signals, improved linearity, reduced interference, reduced power consumption, lower circuit complexity, and lower costs. For a cellular application, these improvements can lead to increased system capacity, smaller telephone size, increased talk and standby times, and greater acceptance of the product. Circuitry is provided to speed up the response time of a control signal. The control loop for various elements in the transmit signal path are integrated. A gain control mechanism allows for accurate adjustment of the output transmit power level. Control mechanisms are provided to power down the power amplifier, or th e entire transmit signal path, when not needed. The gains of the various elements in the transmit signal path are controlled to reduce transients in the output transmit power, and to also ensure that transients are downward.
Inventors:
YOUNIS SAED
SIMIC EMILIJA
WILBORN THOMAS
ZHANG HAITAO
FILIPOVIC DANIEL
KAUFMAN RALPH
LIN JIAN
SIMIC EMILIJA
WILBORN THOMAS
ZHANG HAITAO
FILIPOVIC DANIEL
KAUFMAN RALPH
LIN JIAN
Application Number:
PCT/US2001/006740
Publication Date:
May 02, 2002
Filing Date:
March 02, 2001
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
H03G3/20; H04B1/04; H03G3/30; H04B7/005; H04B7/24; (IPC1-7): H03G3/30
Domestic Patent References:
| WO1999031799A1 | 1999-06-24 |
Foreign References:
| US5504457A | 1996-04-02 | |||
| EP0434294A2 | 1991-06-26 | |||
| US5697073A | 1997-12-09 | |||
| US5590418A | 1996-12-31 | |||
| EP0797299A2 | 1997-09-24 | |||
| EP0883250A2 | 1998-12-09 | |||
| EP0961402A2 | 1999-12-01 | |||
| EP0939501A2 | 1999-09-01 | |||
| US6016312A | 2000-01-18 |
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