Transmitter control circuit
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorKarl Bo Lindell
Life of this patent
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Abstract
The invention relates to an arrangement and to a method for providing a linear transmitter amplifier (11; 50) that remains linear even when the load varies significantly over the passage of time. A detector circuit (14; 48) on the output of the amplifier (11; 50) identifies which of the current or the voltage lies closest to its maximum value. This signal is then used as a real or actual value in a regulating system (17; 40) for linearising the amplifier.
Claims9
An arrangement for transmitting and amplifying an input signal (11;
- 50) and a load (12;
- 51) connected to the transmitter, characterised in that the arrangement also includes
- a detector circuit (14;
- 48) between transmitter (11;
- 50) and load (12;
- 51) which is adapted to deliver as a detector output signal (18;
- 49) that voltage or that current on the transmitter output (13;
- 52) which lies closest to its respective maximum value at that moment in time, wherein the detector output signal (18;
- 49) is applied to a control system (17;
- 40) for feedback of said signal to the transmitter (11;
- 50) and wherein the control system regulates the output signal of the transmitter (11;
- 50).
A method of transmitting and amplifying an input signal in an arrangement that includes a transmitter (11;
- 50) and a load (12;
- 51) connected to the transmitter, characterised by determining whether the voltage or the current on the transmitter output (13;
- 52) lies closest to its respective maximum value at that moment in time, and feeding this value back to the transmitter via a regulating system (17;
- 40) so as to regulate the output signal of the transmitter (11;
- 40).
Dependencies are inferred from the claim text.