Baseband circuit incorporated in direct conversion receiver...

Details Baseband circuit incorporated in direct conversion receiver... Baseband circuit incorporated in direct conversion receiver...

2006-10-24

2006-10-24

Gelin, Jean (Department: 2617)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S249100, C455S236100

Reexamination Certificate

active

07127224

ABSTRACT:
A base band circuit forms a part of an automatic gain controller incorporated in a direct conversion receiver, and includes a series of variable gain amplifiers controlled by a gain controller and a feedback loop connected between the output node and the input node of the series of variable gain amplifiers, wherein the feedback loop has an attenuation circuit connected between the output node of the series of variable gain amplifiers and an inverted integrating circuit which, in turn, is connected through an adder and a low pass filter to the input node of the series of variable gain amplifiers so that direct current offset voltage is eliminated from the output signal of the series of variable gain amplifiers without change of cut-off frequency.

REFERENCES:
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patent: 6327313 (2001-12-01), Traylor et al.
patent: 6516187 (2003-02-01), Williams et al.
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patent: 60-186709 (1985-12-01), None
patent: 08-18357 (1996-01-01), None
Pärssinen et al., “A 2-GH, Wide-Band Direct Conversion Receiver for WCDMA Applications”, Journal of Solid-State Circuits, vol. 34, No. 12, Dec. 1999, pp. 1893-1903, no month.
Peter Kreuzgruber, “A Class of Binary FSK Direct Conversion Receivers,” Vehicular Technology Conference, 1994 IEEE 4th Stockholm, Sweden Jun. 8-10, 1994, pp. 457-461.
Jan Crols et al., “Low-IF Topologies for High-Performance Analog Front Ends of Fully Integrated Receivers,” IEEE Transactions on Circuits and System-II: Analog and Digital Signal Processing, V. 45, 1998, pp. 269-282, no month listed.

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