Method and apparatus for providing a local oscillator signal

Details Method and apparatus for providing a local oscillator signal Method and apparatus for providing a local oscillator signal

2001-09-25

2008-12-16

Ramakrishnaiah, Melur (Department: 2614)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S168100, C455S188100

Reexamination Certificate

active

07466968

ABSTRACT:
A multi-band RF transceiver (100) includes a single dual band VCO (102) that is used in both transmit and receive modes of operation. The VCO's low band frequency output signal that is provided on output line (120) is multiplied by two by multiplier circuit (1302), when in the high band receive mode, as for example, when receiving a PCS or DCS signal. The VCO's high band frequency output signal provided on output line (120) is divided by two by divider circuit (130) when in the low band receive mode, as for example, when receiving a GSM signal. The single multi-band VCO (102) design provides for low susceptibility to both LO leakage and DC offset caused by radiation.

REFERENCES:
patent: 6484014 (2002-11-01), Koszarsky
patent: 6484038 (2002-11-01), Gore et al.
patent: 6574462 (2003-06-01), Strange
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patent: 6690949 (2004-02-01), Shamlou et al.
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Web Page, Philips Semiconductors: Product Information on UAA3535HL, Sep. 22, 2000, pp. 1-2.
Data Sheet, Philips Semiconductors, UAA3535HL Low Power GSM/DCS/PCS Multi-Band Transceiver, Feb. 17, 2000, pp. 1-24.

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