Method and an arrangement for compensating the temperature drift of a detector and a control signal in periodic control
First Claim
1. A method for reducing the effects of drift of a detector of transmitted power and of a transmission power control signal in a transmitter arranged to transmit in an intermittent fashion, the output signal from the detector and the control signal controlling at least in part the transmission power of the transmitter, comprising at least steps ofstoring of a voltage difference between the output voltage of the detector and the control signal during a pause in transmission, and using said stored voltage difference for compensating the drift of the detector and the control signal during a transmission period.
2 Assignments
0 Petitions
Accused Products
Abstract
The object of the invention is the compensation of the drift in a detector and a control signal (TXC), particularly in the control of the transmit power (RFOUT) of an RF time division TDMA signal (RFIN), for the control of which there is performed a power detection. According to the invention the voltage difference between the output voltage of the detection and the control signal is stored during a transmission pause, and during the transmission state the stored voltage difference is used to compensate the temperature drift of the detection and the control signal (TXC) in generating the gain control voltage (VCTRL). The voltage difference is stored in a capacitor connected between the detector and a feedback connected differential amplifier by connecting the inputs of the differential amplifier to each other and by connecting the output of the differential amplifier to a constant potential when the control signal (TXC) is connected to an input of the differential amplifier which is not that input to which said capacitor is connected. Also alternative ways to perform the storage are presented.
-
Citations
22 Claims
-
1. A method for reducing the effects of drift of a detector of transmitted power and of a transmission power control signal in a transmitter arranged to transmit in an intermittent fashion, the output signal from the detector and the control signal controlling at least in part the transmission power of the transmitter, comprising at least steps of
storing of a voltage difference between the output voltage of the detector and the control signal during a pause in transmission, and using said stored voltage difference for compensating the drift of the detector and the control signal during a transmission period.
-
8. System for compensating drifts in a transmitter arranged to transmit in an intermittent fashion, the transmitter having at least a detector of transmitted power and a control signal line for controlling the transmitted power, comprising at least
means for storing the voltage difference between the output voltage of the detector and the control voltage in the control signal line during a pause in transmission, and means for compensating the drift of the detector and the control signal during a transmission period using a stored voltage difference stored by said means for storing.
-
22. A mobile communication means comprising
a system for compensating drifts in the transmitter of the mobile communication means, and in said system, means for storing the voltage difference between the output voltage of the detector and the control voltage in the control signal line during a pause in transmission, and in said system, means for compensating the drift of the detector and the control signal during a transmission period using a stored voltage difference stored by said means for storing.
Specification