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AssigneeBroadcom Corporation
InventorMichael (Meng-An) Pan
Estimating the term…
In an RF communication system, aspects of constant or proportional to absolute temperature biasing for minimizing transmitter output power variation may comprise configuring at least one current source to provide a temperature dependent current, where the current may be constant with temperature or vary proportionally to absolute temperature. A control voltage that may be generated by an operational amplifier may be fed back to control the current source. An input reference voltage may also be generated for the operational amplifier by utilizing PN junction characteristics of at least one bipolar junction transistor. Resistance may be adjusted to allow operation of the current source at a plurality of different supply voltages, including the different supply voltages that may be less than 1.2 volts, for example. Additionally, adjusting the resistance may also allow the current to be constant with temperature or vary with temperature.
A method for controlling output power in a communication device, the method comprising:
A system for output power control, the system comprising:
Dependencies are inferred from the claim text.
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Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements: high-frequency amplifiers, e.g. radio frequency amplifiers
Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements: modifications of…
Amplifiers
Term ended 26 Feb 2025 (estimated)
This application makes reference to: U.S. patent application Ser. No. 11/000599 filed Nov. 30, 2004: and U.S. patent application Ser. No. 11/001438 filed Nov. 30, 2004.
The above stated applications are being incorporated herein by reference in their entirety.
Certain embodiments of the invention relate to transmitting radio frequency signals. More specifically, certain embodiments of the invention relate to a method and system for constant or proportional to absolute temperature (PTAT) biasing for minimizing transmitter output power variation.
FIG. 1a is a block diagram of exemplary transmitter system and receiver system that may be utilized in connection with an embodiment of the invention.
FIG. 1b is a block diagram of exemplary transmitter system of FIG. 1a that may be utilized in connection with an embodiment of the invention.
FIG. 2 is a block diagram illustrating exemplary current source controller, in accordance with an embodiment of the invention.
Certain embodiments of the invention may be found in a method and system for transmitter output power compensation. Various aspects of the invention may be utilized in, for example, a mobile communication handset, which may be adapted to transmit RF signals. Transmit power specifications for the handset may have a very narrow range, for example, 3 decibels-milliwatt (dBm), plus or minus 2 decibels (dBs), and operating temperature variation for the handset may cause the transmit power to drift out of the specified power range. An embodiment of the invention may compensate for transmitter power fluctuations due to temperature variations.
FIG. 1a is a block diagram of exemplary transmitter system and receiver system that may be utilized in connection with an embodiment of the invention. Referring to FIG. 1a, there is shown a transmitter block 110 and a receiver block 120. The transmitter block 110 may comprise suitable logic, circuitry, and/or code that may be adapted to filter, modulate, and amplify a baseband signal to an RF signal, and transmit the RF signal. The receiver block 120 may comprise suitable logic, circuitry, and/or code that may be adapted to receive the RF signal and to demodulate the RF signal to the baseband signal.
In operation, the transmitter block 110 may be adapted to transmit RF signals over a wired or wireless medium. The receiver block 120 may be adapted to receive the RF signals and process it to a baseband signal that may be suitable for further processing, for example, as data or voice.