Two band receiver

Details Two band receiver Two band receiver

1996-12-20

1998-11-10

Vo, Nguyen

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551891, 455266, H04B 118

Patent

active

058358536

ABSTRACT:
A receiver comprises; an input TERM (11) for receiving a radio wave signal including at least one of 1st and 2nd radio wave components from an antenna; a 1st SW (12); a 1st BPF (13) for extracting the 1st radio wave component; a 2nd BPF (14) for extracting the 2nd radio wave component; a 2nd SW (17), the 1st and 2nd SW to selectively forming 1st and 2nd SIG passages through the 1st BPF in a 1st mode and the 2nd BPF in a 2nd mode respectively; a 1st LO (19) for generating 1st and 2nd LO SIGs (30a, 30b) in the 1st and 2nd modes respectively; a 1st mixer (18) for mixing an output of the 2nd SW with the 1st and 2nd LO SIGs in the 1st and 2nd modes respectively; a 1st FLT (21) for filtering an output of the 1st mixer to output 1st and 2nd IF SIGs having the same FRQ; a 2nd LO (22), 2nd mixer (23), a 2nd FLT (25) for generating 3rd and 4th IF SIGs corresponding to the 1st and 2nd radio wave components from an output of the 1st FLT in the 1st and 2nd modes, respectively. A receiver includes two sets of the receivers except 1st and 2nd LOs commonly used, which provides a diversity receiving. The receiver may further comprise a SW and another input coupled to another antenna. This SW provides another diversity receiving. A modified receiver provides a diversity receiving after an antenna and after detection.

REFERENCES:
patent: 4115737 (1978-09-01), Hongu et al.
patent: 4132952 (1979-01-01), Hongu et al.
patent: 4419768 (1983-12-01), Yamashita et al.
patent: 5020147 (1991-05-01), Okanobu
patent: 5369800 (1994-11-01), Takagi et al.

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