Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Patent
1997-06-19
1999-11-16
Vo, Nguyen
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
455 674, 455115, 455254, 455340, H04B 138
Patent
active
059873140
ABSTRACT:
A radio communication apparatus uses an intermediate frequency section to convert a signal from a receiver into an intermediate frequency signal. The intermediate frequency signal is filtered in a filter section, and then demodulated. Matching circuits with variable circuit constants connect the filter section with the intermediate frequency section and the demodulator. A control section supplies a transmitter with an input signal which is then transmitted to the receiver, converted to an intermediate frequency, filtered, and demodulated. The control section adjusts the variable circuit constants in accordance with the input signal and the demodulated signal. Thus, inappropriate circuit constants are adjusted so that the radio apparatus has a high receiving sensitivity without a mismatch.
REFERENCES:
patent: 5023941 (1991-06-01), Trumpff et al.
patent: 5216392 (1993-06-01), Fraser et al.
patent: 5313656 (1994-05-01), Vaisanen et al.
patent: 5481186 (1996-01-01), Heutmaker et al.
patent: 5822687 (1998-10-01), Bickley et al.
patent: 5870428 (1999-02-01), Miller et al.
Kincaid Lester G.
NEC Corporation
Vo Nguyen
LandOfFree
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