Method of receiving data signals in a radio transceiver using lo

Details Method of receiving data signals in a radio transceiver using lo Method of receiving data signals in a radio transceiver using lo

1994-05-20

1996-07-16

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455 86, 455207, 455209, 455314, H04B 126

Patent

active

055376762

ABSTRACT:
A method of receiving a data signal in a radio transceiver by passing an input receive signal through an input bandpass filter having a bandwidth sufficient to reject signals with frequencies equal to or greater than the receive signal frequency plus a first intermediate frequency (IF) signal frequency plus a first standard IF signal frequency and also to reject signals with frequencies less than the receive signal frequency minus twice the first IF frequency, and downconverting the input filter filtered input receive signal by the transmit frequency to produce the first IF signal. The first IF signal is filtered in an LC filter, and the filtered first IF signal is mixed with a local oscillator signal having a difference frequency therefrom which is equal to the first standard IF frequency to produce the first standard IF signal. The first standard IF signal is filtered in a standard IF filter, the filtered first standard IF signal is downconverted to a second standard IF frequency signal, and filtering, limiting and discriminating the second standard IF frequency signal by a standard filter, limiter and discriminator.

REFERENCES:
patent: 4862175 (1989-08-01), Biggs et al.
patent: 5300838 (1994-04-01), Elizondo

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