Feedforward spur cancellation approach using low IP amplifier

Details Feedforward spur cancellation approach using low IP amplifier Feedforward spur cancellation approach using low IP amplifier

2007-12-11

2007-12-11

Nguyen, Duc M. (Department: 2618)

Telecommunications

Transmitter

Having harmonic radiation suppression

C455S114200, C455S296000, C330S149000, C330S151000

Reexamination Certificate

active

11038333

ABSTRACT:
A power amplifier circuit (40) that includes an error correction loop (44) having a lower IP3 error correction amplifier (54) than a main power amplifier (46) in a main signal path (48). A first attenuator (52) in the error loop (44) 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 (54) amplifies the attenuated RF signal from the first attenuator (52). A second attenuator (56) in the error loop (44) attenuates the RF signal from the error correction amplifier (54). A phase shifter (58) phase shifts the RF signal from the second attenuator (56). A coupler (50) couples the amplified RF signal and the phase shifted RF signal to cancel out intermodulation products in the amplified RF signal.

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