Receiving device and integrated circuit for reception

Details Receiving device and integrated circuit for reception Receiving device and integrated circuit for reception

2005-06-07

2005-06-07

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Receivers

Reexamination Certificate

active

06904103

ABSTRACT:
In order to improve various characteristics of a receiving circuit for digital radio services, circuits are provided for forming two local oscillation signals, whose frequencies are both the center frequency between a first ensemble and a second ensemble, and whose phases differ by 90° from each other. Furthermore, there are provided mixer circuits for frequency-converting the received signal into intermediate frequency signals in accordance with the local oscillation signals, phase-shift circuits to which the intermediate frequency signals are supplied, and an addition/subtraction circuit for performing one of addition and subtraction of the outputs of the phase-shift circuits. In addition, there are provided intermediate frequency filters to which the output signal of the addition/subtraction circuit is supplied and demodulation circuits to which the output signals of the intermediate frequency filters are supplied. By switching the process in the addition/subtraction circuit to addition or subtraction, the signals of the first ensemble and the second ensemble are selectively extracted from the demodulation circuits.

REFERENCES:
patent: 4803700 (1989-02-01), Dewey et al.
patent: 6002359 (1999-12-01), Chen
patent: 6018553 (2000-01-01), Sanielevici et al.
patent: 6081697 (2000-06-01), Haartsen
Razavi, B.: “A 900-MHz/1.8-GHz CMOS transmitter for dual-band applications” VLSI Circuits, 1998. Digest of Technical Papers. 1998 Symposium on Honolulu, HI, USA Jun. 11-13, 1998, New York, NY, USA, IEEE, US, oages 128-131, XP010291264.

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