Polar amplification transmitter distortion reduction
First Claim
1. A method of envelope tracking by an envelope tracking transceiver, the envelope tracking transceiver including a transmitter including an envelope tracking amplification stage arranged to receive an input signal to be amplified and a power supply voltage tracking the envelope of the input signal to be amplified, and a receiver being located with the transmitter and for receiving a received signal, the method comprising:
- generating an amplified signal for transmission at the output of the amplifier;
tuning the receiver to a frequency to reject the intended transmit signal of the transmitter;
generating a sequence of adjustment values during one or more periods;
generating a signal indicative of a characteristic of the received signal;
multiplying the signal indicative of the characteristic of the received signal and the generated sequence of adjustment values for each of the periods;
generating an adjustment signal based on the multiplication;
andadjusting a setting of the transmitter in dependence on the adjustment signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of optimizing a transmitter, the transmitter including a polar amplification stage including a main signal path and a magnitude signal path, a receiver being located with the transmitter, the method comprising: generating an amplified signal for transmission at the output of the amplifier; tuning the receiver to a frequency to reject the intended transmit signal of the transmitter; determining a characteristic of a signal detected in the receiver representing an indication of distortion in the transmitted signal; and adjusting a setting of the transmitter in dependence on the determined characteristic.
112 Citations
18 Claims
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1. A method of envelope tracking by an envelope tracking transceiver, the envelope tracking transceiver including a transmitter including an envelope tracking amplification stage arranged to receive an input signal to be amplified and a power supply voltage tracking the envelope of the input signal to be amplified, and a receiver being located with the transmitter and for receiving a received signal, the method comprising:
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generating an amplified signal for transmission at the output of the amplifier; tuning the receiver to a frequency to reject the intended transmit signal of the transmitter; generating a sequence of adjustment values during one or more periods; generating a signal indicative of a characteristic of the received signal; multiplying the signal indicative of the characteristic of the received signal and the generated sequence of adjustment values for each of the periods; generating an adjustment signal based on the multiplication; and adjusting a setting of the transmitter in dependence on the adjustment signal. - View Dependent Claims (2, 3, 4, 7, 8)
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5. The method of claim wherein adjusting the setting in the transmitter comprises adjusting one or more of a delay in a main signal path, or a delay in the magnitude signal path.
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6. The method of claim wherein the transmitter further includes a shaping function block for generating a supply voltage in dependence on the magnitude of the signal to be amplified, and wherein adjusting the setting of the transmitter comprises adjusting a setting of the shaping function block.
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9. A transceiver comprising:
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an envelope tracking transmitter including an envelope tracking amplification stage arranged to receive an input signal to be amplified and a power supply voltage tracking the envelope of the input signal to be amplified, wherein the envelope tracking transmitter is configured to generate an amplified signal for transmission at an output of the amplification stage; and a receiver adapted to reject an intended transmit signal of the transmitter, wherein the receiver comprises; a sequence generator adapted to generator a sequence of adjustment values during one or more periods; a receiver characteristic signal generator adapted to generate a signal indicative of a characteristic of a received signal in the receiver; a multiplier adapted to multiply the signal indicative of the characteristic of the received signal and the generated sequence of adjustment values for each of the periods; a subtractor adapted to generate an adjustment signal based on the multiplication; and a controller adapted to for adjust a setting of the transmitter in dependence on the adjustment signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification