Feedforward spur cancellation approach using low IP amplifier

A power amplifier circuit that includes an error correction loop having a lower IP3 error correction amplifier than a main power amplifier in a main signal path. A first attenuator in the error loop attenuates the RF signal, and provides more attenuation of intermodulation products in the RF signal...

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Bibliographische Detailangaben
1. Verfasser: Kintis, Mark
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:A power amplifier circuit that includes an error correction loop having a lower IP3 error correction amplifier than a main power amplifier in a main signal path. A first attenuator in the error loop attenuates the RF signal, and provides more attenuation of intermodulation products in the RF signal and about the same attenuation for a main frequency of the RF signal for each dB of attenuation. The error amplifier amplifies the attenuated RF signal from the first attenuator. A second attenuator in the error loop attenuates the RF signal from the error correction amplifier. A phase shifter phase shifts the RF signal from the second attenuator. A coupler couples the amplified RF signal and the phase shifted RF signal to cancel out intermodulation products in the amplified RF signal.