Quadrature envelope-sampling of intermediate frequency signal in receiver
AssigneeKoninklijke Phillips Electronics N.V.
InventorYiping Fan
Life of this patent
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Abstract
An apparatus and method for the two-dimensional direct intermediate frequency sampling of a received signal. A receiver is equipped with a circuit for converting a received radio frequency signal to an intermediate frequency signal. The converted intermediate frequency signal is sampled by a pair of lowpass analog-to-digital converters. The sampling scheme involves quadrature envelope sampling of the intermediate frequency signal. The sampling scheme further involves sampling the Q-channel signal at a quarter of the intermediate frequency carrier period after the I-channel signal is sampled.
Claims17
A receiver comprising:
- a radio frequency mixer;
- an intermediate frequency filter;
- an amplifier;
- a first lowpass analog-to-digital converter directly connected to said amplifier;
- a second lowpass analog-to-digital converter directly connected to said amplifier;
- and
- a digital signal processor connected to said first and second lowpass analog-to-digital converters.
A method for direct sampling of an intermediate frequency signal in a receiver comprising:
- receiving a signal;
- converting said signal to an intermediate frequency signal;
- filtering said intermediate frequency signal;
- amplifying said filtered intermediate frequency signal;
- directly sampling said amplified intermediate frequency signal;
- and
- processing said directly sampled signal with a digital signal processor.
Dependencies are inferred from the claim text.