Telecommunications – Transmitter – Power control – power supply – or bias voltage supply
Reexamination Certificate
1998-12-08
2001-10-02
Nguyen, Lee (Department: 2683)
Telecommunications
Transmitter
Power control, power supply, or bias voltage supply
C455S069000, C455S070000, C455S126000, C455S127500
Reexamination Certificate
active
06298222
ABSTRACT:
The present invention relates to a communication system outlined in the preamble of claim
1
.
The present invention further relates to a communication device outlined in the preamble of claim
9
, which is suitable for application in the communication system and to a method outlined in the preamble of claim
11
, and to a communication method.
Such a communication system and device are known from U.S. Pat. No. 5,251,331 disclosing in particular a communication system such as a cellular radio system, provided with communication devices embodied as radio telephones containing a dual mode RF power amplifier and a two-level output power supply coupled to the RF power amplifier. The power supply output provided shows voltages V
1
and V
2
depends on the types of respective modes the system operates in. The modes include the digital mode and the analog mode which possess different demands on the supply voltage control for the RF power amplifier when it comes to maintaining an acceptable level of the efficiency of the RF power amplifier.
It is a disadvantage of the known communication system, communication device and method that they do not provide adequate flexibility, as to efficient adjustment concepts of the power dissipation in an RF power amplifier included especially in a portable/mobile communication environment.
It is an object of the present invention to provide a communication device with reduced power consumption, not having the above drawbacks.
To this end a communication system and a communication device according to the invention have characterising features outlined in claims
1
and
9
, respectively.
It is an advantage of the communication system according to the invention that within the notion of applying table means in order to adjust the RF output power the communication device may use several possible control loop concepts for communication with the base station, which concepts are applicable in order to reduce the power consumption in an RF power amplifier during transmit sessions. Also hardware architectural simplifications are principally within reach, which reduces the power consumption even further such that the discharge time of a battery included in portable/mobile devices may be increased or its required capacity/size may be reduced.
The listed data in the table means containing the relation between possible power supply control input values for the power supply and possible RF output power values can now at wish without any waste or surplus of RF output power be adjusted upon manufacturing to the particulars of the circuitry used in the type of communication device. It is to be noted that the power supply output can either contain a power supply current, or a power supply voltage which will generally be the case.
In an embodiment of a communication system according to the invention additional variables such as the working frequency of the RF output signal, and/or temperature parameters may be included as additional variables for fine tuning the required RF output power, in particular the output voltage, for providing an RF output signal of the RF power amplifier with the desired magnitude and frequency.
Preferably the table means comprise easy to implement and handle, relatively cheap memory means.
In a still further embodiment outlined in claim
4
three possible embodiments are described in greater detail. In first and second possible embodiments comparator means for comparing information about a desired RF output value to the actual RF output value is included in the communication device, whereas in a third embodiment this comparator means can even be dispensed with from the communication device(s).
An embodiment of the communication system according to the invention outlined in claim
7
provides switching of the RF output power to maximum RF output power substantially without any loss in efficiency.
In applications wherein the RF power of the RF power output is adjusted by controlling the supply voltage to the RF power amplifier an efficient DC/DC voltage converter is preferred.
Consequently the method according to the present invention referred to above has the advantageous characterising features outlined in claim
11
.
REFERENCES:
patent: 5056109 (1991-10-01), Gilhousen et al.
patent: 5129398 (1992-07-01), McGirr et al.
patent: 5251331 (1993-10-01), Schwent et al.
patent: 5710981 (1998-01-01), Kim et al.
patent: 5732334 (1998-03-01), Miyake
patent: 5774797 (1998-06-01), Kawano et al.
patent: 5999829 (1999-12-01), Chun et al.
Patent Abstract of Japan, Publication Number:09064757A, Mar. 7, 1997.
Bergveld Hendrik J.
Schoofs Franciscus A. C. M.
Nguyen Lee
Nguyen Simon
U.S. Philips Corporation
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