Excess current and saturation detection and correction in a power amplifier
First Claim
1. A transmit system for a mobile terminal comprising:
- a) over-current detection and correction circuitry adapted to;
i) combine a current detection signal indicative of an output current of power amplifier circuitry in the transmit system during ramp-up for a transmit burst and a substantially inverse current ramping profile to provide a first constant value;
ii) compare the first constant value to a current threshold value to determine whether an over-current condition exists; and
iii) if an over-current condition exists, reduce an output power of the power amplifier circuitry during ramp-up for the transmit burst to correct for the over-current condition.
4 Assignments
0 Petitions
Accused Products
Abstract
A system and method for detecting and correcting over-current and/or over-voltage conditions in power amplifier circuitry in a transmit chain of a mobile terminal are provided. In general, over-current detection and correction circuitry combines a current detection signal indicative of a current provided to or drained by the power amplifier circuitry during ramp-up for a transmit burst and a substantially inverse current ramping profile to provide a first constant value. The first constant value is compared to a current threshold or limit value to determine whether an over-current condition exists. If an over-current condition exists, the over-current detection and correction circuitry operates to reduce the output power of the power amplifier circuitry during ramp-up for the transmit burst to correct for the over-current condition. In a similar manner, over-voltage detection circuitry operates to detect and correct over-voltage conditions during ramp-up for the transmit burst.
91 Citations
24 Claims
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1. A transmit system for a mobile terminal comprising:
a) over-current detection and correction circuitry adapted to; i) combine a current detection signal indicative of an output current of power amplifier circuitry in the transmit system during ramp-up for a transmit burst and a substantially inverse current ramping profile to provide a first constant value; ii) compare the first constant value to a current threshold value to determine whether an over-current condition exists; and iii) if an over-current condition exists, reduce an output power of the power amplifier circuitry during ramp-up for the transmit burst to correct for the over-current condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A transmit system for a mobile terminal comprising:
a) over-voltage detection and correction circuitry adapted to; i) combine a signal indicative of a supply voltage provided to power amplifier circuitry in the transmit system during ramp-up for a transmit burst and a substantially inverse voltage ramping profile to provide a first constant value; ii) compare the first constant value to a voltage threshold value to determine whether an over-voltage condition exists; and iii) if an over-voltage condition exists, reduce an output power of the power amplifier circuitry during ramp-up for the transmit burst to correct for the over-voltage condition. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A transmit system for a mobile terminal comprising:
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a) over-current detection and correction circuitry adapted to; i) combine a current detection signal indicative of an output current of power amplifier circuitry in the transmit system during ramp-up for a transmit burst and a substantially inverse current ramping profile to provide a first constant value; ii) compare the first constant value to a current threshold value to determine whether an over-current condition exists; and iii) if an over-current condition exists, reduce an output power of the power amplifier circuitry during ramp-up for the transmit burst to correct for the over-current condition; and b) over-voltage detection and correction circuitry adapted to; i) combine a signal indicative of a supply voltage provided to the power amplifier circuitry in the transmit system during ramp-up for the transmit burst and a substantially inverse voltage ramping profile to provide a second constant value; ii) compare the second constant value to a voltage threshold value to determine whether an over-voltage condition exists; and iii) if an over-voltage condition exists, reduce the output power of the power amplifier circuitry during ramp-up for the transmit burst to correct for the over-voltage condition.
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Specification