# US 7,613,439 B2 · Programmable baseband filters supporting auto-calibration for a mobile digital cellular television environment

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- Number: US 7,613,439 B2
- Document ID: US7613439B2
- Status: Granted
- Kind: B2
- Application number: 11/385,389
- Filed: 2006-03-21
- Published: 2007-03-22
- Granted: 2009-11-03
- Earliest claimed: 2005-09-16
- Assignees: Broadcom Corporation
- Inventors: Spyridon Charalabos Kavadias
- Web page: https://patentgrep.com/patent/US7613439B2

## CPC

- H04B 1/28: the receiver comprising at least one semiconductor device having three or more electrodes
- H03J 3/06: Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
- H04B 1/1036: {with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters (H04B1/123 takes precedence; filter circuits H03H)}
- H04H 40/27: specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H 20/57: for mobile receivers
- H04B: TRANSMISSION
- H03J: TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H04H: BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)

## Abstract

Methods and systems for programmable baseband filters supporting auto-calibration in a mobile digital cellular television environment are provided. Aspects of the method may include generating within a single-chip multi-band RF receiver, at least one control signal based on signal strength of a baseband frequency signal generated within the single-chip multi-band RF receiver. A bandwidth of a filter integrated within the single-chip multi-band RF receiver may be adjusted via the generated at least one control signal. The filter may be used for filtering the generated baseband frequency signal. A frequency response signal of the filter integrated within the single-chip multi-band RF receiver may be determined via a reference frequency signal. An attenuated reference frequency signal may be generated by attenuating the reference frequency signal. The attenuated reference frequency signal may be compared with the frequency response signal. The at least one control signal may be generated based on the comparison.

## Claims

### Claim 1

A method for processing wireless information, the method comprising:
generating within a single-chip multi-band RF receiver, at least one control signal based on a signal strength of a baseband frequency signal generated within said single-chip multi-band RF receiver;
adjusting via said generated at least one control signal, a bandwidth of a filter integrated within said single-chip multi-band RF receiver, said filter being used for filtering said generated baseband frequency signal; and
determining via a reference frequency signal, a frequency response signal of said filter integrated within said single-chip multi-band RF receiver.

### Claim 2 (depends on 1)

The method according to claim 1, comprising generating an attenuated reference frequency signal by attenuating said reference frequency signal.

### Claim 3 (depends on 2)

The method according to claim 2, comprising comparing said attenuated reference frequency signal with said frequency response signal.

### Claim 4 (depends on 3)

The method according to claim 3, comprising generating said at least one control signal based on said comparison.

### Claim 5 (depends on 3)

The method according to claim 3, comprising averaging said attenuated reference frequency signal and said frequency response signal prior to said comparing.

### Claim 6

A system for processing wireless information, the system comprising:
a single-chip multi-band radio frequency (RF) receiver that enables generation within said single-chip multi-band RF receiver, of at least one control signal based on a signal strength of a baseband frequency signal generated within said single-chip multi-band RF receiver;
said single-chip multi-band RF receiver enables adjusting via said generated at least one control signal, of a bandwidth of a filter integrated within said single-chip multi-band RF receiver, said filter being used for filtering said generated baseband frequency signal; and
said single-chip multi-band RF receiver enables determining via a reference frequency signal, of a frequency response signal of said filter integrated within said single-chip multi-band RF receiver.

### Claim 7 (depends on 6)

The system according to claim 6, wherein said single-chip multi-band RF receiver enables generation of an attenuated reference frequency signal by attenuating said reference frequency signal.

### Claim 8 (depends on 7)

The system according to claim 7, wherein said single-chip multi-band RF receiver enables comparing of said attenuated reference frequency signal with said frequency response signal.

### Claim 9 (depends on 8)

The system according to claim 8, wherein said single-chip multi-band RF receiver enables generation of said at least one control signal based on said comparison.

### Claim 10 (depends on 8)

The system according to claim 8, wherein said single-chip multi-band RF receiver enables averaging of said attenuated reference frequency signal and said frequency response signal prior to said comparing.