Dual band, dual mode transceiver with adaptive second if switchi

Details Dual band, dual mode transceiver with adaptive second if switchi Dual band, dual mode transceiver with adaptive second if switchi

1998-12-29

2000-05-30

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Automatic frequency control

455553, H04L 2706

Patent

active

060699256

ABSTRACT:
An apparatus for use within a a dual band, dual mode transceiver for adaptively switching a second intermediate frequency to increase a receiving sensitivity. In the apparatus, a PLL IC compares sync data provided from a central processing unit with a reference frequency signal provided from a reference oscillator, to output AC data. A first loop filter converts the AC data to DC data with a given level according to a first band, and a second loop filter converts the AC data to DC data with a given level according to a second band. A first tank circuit connected to the first loop filter, determines a second intermediate frequency for the first band, and a second tank circuit connected to the second loop filter, determines a second intermediate frequency for the second band. A switch selects one of the second intermediate frequencies output from first and second tank circuits according to operation modes. A buffer connected to one of the first and second tank circuits through the switch, buffers the selected second intermediate frequency.

REFERENCES:
patent: 5722053 (1998-02-01), Kornfeld et al.
patent: 5758266 (1998-05-01), Kornfeld et al.
patent: 5821820 (1998-10-01), Snider et al.
patent: 5856763 (1999-01-01), Reeser et al.
patent: 5890051 (1999-03-01), Schlang et al.
patent: 5963852 (1999-10-01), Schlang et al.
patent: 5966667 (1999-10-01), Halloran et al.

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