Interference suppression in RF signals

Details Interference suppression in RF signals Interference suppression in RF signals

1998-03-31

2000-06-13

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455310, 455296, 455209, 455324, 375346, H04Q 720

Patent

active

060759801

ABSTRACT:
An I/Q direct conversion receiver has an input (5,6) for receiving an RF signal comprising a wanted signal having in-phase and quadrature phase channels modulated onto in-phase and quadrature carrier signals. A signal splitter (7) divides the receiver RF signal into three in-phase signal components. Three substantially identical mixers (8) are provided and receive respective RF signal components for mixing with local oscillator signals. The first mixer (8a) receives the local oscillator signal shifted by 45.degree., the second mixer (8b) receives the local oscillator signal shifted by -45.degree., whilst the third mixer (8c) receives the local oscillator signal shifted by 180.degree.. A correction signal is generated by summing at a summing amplifier (11) the first and second baseband signals together with the third baseband signal after appropriate scaling. The in-phase and quadrature phase baseband signals are then corrected by combining these signals at respective comparators (13) with the correction signal.

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