Detecting usable frequency channels by exploiting complex...

Details Detecting usable frequency channels by exploiting complex... Detecting usable frequency channels by exploiting complex...

2006-12-12

2006-12-12

Nguyen, Tony T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

C455S115300, C455S218000, C455S225000

Reexamination Certificate

active

07149498

ABSTRACT:
A circuit arrangement for detecting a usable frequency channel includes first and second devices for performing frequency conversion. The first and second frequency conversion devices have respective local oscillator inputs to which respective local oscillator signals are applied. The local oscillator signals are at a common frequency and have a phase difference of precisely 90°. A complex polyphase filter has first and second filter inputs connected to respective outputs of the first and second frequency conversion devices. A detection arrangement is connected to outputs of the complex polyphase filter in order to detect a signal level. A further arrangement can vary the phase angle of a signal output from at least one of the frequency conversion devices.

REFERENCES:
patent: 6148048 (2000-11-01), Kerth et al.
patent: 6397050 (2002-05-01), Peterson et al.
patent: 2004/0152436 (2004-08-01), Masenten et al.
patent: WO 01/48909 (2001-07-01), None

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