VSWR tolerant power detector
First Claim
1. A system for detecting an output power of power amplifier circuitry comprising:
- in-phase amplifier circuitry comprising an input amplifier stage and a final amplifier stage and adapted to amplify an in-phase input signal to provide an in-phase output signal;
quadrature phase amplifier circuitry comprising an input amplifier stage and a final amplifier stage and adapted to amplify a quadrature phase input signal to provide a quadrature phase output signal;
quadrature combiner circuitry adapted to provide an amplified radio frequency (RF) output signal by combining the in-phase output signal and the quadrature phase output signal; and
a power detection system adapted to provide a power detection signal indicative of an output power of the power amplifier circuitry based on an in-phase detect signal indicative of a current through the final amplifier stage of the in-phase amplifier circuitry and a quadrature phase detect signal indicative of a current through the final amplifier stage of the quadrature phase amplifier circuitry.
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Accused Products
Abstract
A system is provided for detecting the output power of power amplifier circuitry in a transmitter of a mobile terminal. Balanced power amplifier circuitry is provided having in-phase power amplifier circuitry and quadrature phase amplifier circuitry. A power detection system provides a power detection signal indicative of the output power of the balanced power amplifier circuitry based on an in-phase detect signal indicative of some measurable parameter that varies with power, such as current, in a final amplifier stage of the in-phase amplifier circuitry and a quadrature phase detect signal indicative of some measurable parameter that varies with power, such as current, in a final stage of the quadrature phase amplifier circuitry.
27 Citations
24 Claims
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1. A system for detecting an output power of power amplifier circuitry comprising:
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in-phase amplifier circuitry comprising an input amplifier stage and a final amplifier stage and adapted to amplify an in-phase input signal to provide an in-phase output signal; quadrature phase amplifier circuitry comprising an input amplifier stage and a final amplifier stage and adapted to amplify a quadrature phase input signal to provide a quadrature phase output signal; quadrature combiner circuitry adapted to provide an amplified radio frequency (RF) output signal by combining the in-phase output signal and the quadrature phase output signal; and a power detection system adapted to provide a power detection signal indicative of an output power of the power amplifier circuitry based on an in-phase detect signal indicative of a current through the final amplifier stage of the in-phase amplifier circuitry and a quadrature phase detect signal indicative of a current through the final amplifier stage of the quadrature phase amplifier circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for detecting an output power of power amplifier circuitry comprising:
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a balanced power amplifier comprising in-phase amplifier circuitry adapted to amplify an in-phase radio frequency (RF) signal and quadrature phase amplifier circuitry adapted to amplify a quadrature phase RF input signal; and a power detection system adapted to provide a power detection signal indicative of an output power of the power amplifier circuitry based on an in-phase detect signal indicative of a current through a final amplifier stage of the in-phase amplifier circuitry and a quadrature phase detect signal indicative of a current through a final amplifier stage of the quadrature phase amplifier circuitry, wherein a total of the current through the final amplifier stage of the in-phase amplifier circuitry and the current through the final amplifier stage of the quadrature phase amplifier circuitry is relatively constant as load impedance varies for a given power level of the balanced power amplifier.
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13. A system for detecting an output power of power amplifier circuitry comprising:
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in-phase amplifier circuitry adapted to amplify an in-phase input signal to provide an in-phase output signal; quadrature phase amplifier circuitry adapted to amplify a quadrature phase input signal to provide a quadrature phase output signal; quadrature combiner circuitry adapted to provide an amplified radio frequency (RF) output signal by combining the in-phase output signal and the quadrature phase output signal; and a power detection system adapted to provide a power detection signal indicative of an output power of the power amplifier circuitry based on an in-phase detect signal indicative of a current through the in-phase amplifier circuitry and a quadrature phase detect signal indicative of a current through the quadrature phase amplifier circuitry. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification