US 6,311,051 B1 · Mobile communication system with offset compensation circuitry

Abstract

A mobile communication system comprising an analog baseband processor that is configured for providing improved DC offset compensation. An offset compensation circuit of the analog baseband processor generates a first DC offset compensation signal to preset DC offset voltage of analog baseband signal when the mobile communication system is power on. A mobile station modem of the mobile communication system generates a second DC offset compensation signal to compensate for a detected DC offset voltage during operation of the mobile communication system subsequent to the DC offset voltage being preset. In addition, the offset compensation circuit re-presets the DC offset by generating a third DC offset compensation signal whenever the mobile communication system enters a predetermined mode of operation such as a “data send” mode.

Claims15

Dependent claims

A mobile communication system, comprising:

a first down-converter for converting a radio frequency (RF) signal into an intermediate frequency (IF) signal;
a baseband analog processor for converting the IF signal into an analog baseband signal and for converting the analog baseband signal into a digital baseband signal;
and
a modem for demodulating the digital baseband signal;
wherein the baseband analog processor is configured for generating a first DC offset compensation signal to preset a DC offset voltage of the analog baseband signal when the mobile communication system is powered on, and for generating a second DC offset compensation signal to re-preset a DC offset voltage of the analog baseband signal when the mobile communication system enters a predetermined mode of operation, and wherein the modem is configured for generating a third DC offset compensation signal to compensate for a DC offset voltage that is detected by the modem subsequent to preset and re-preset of the DC offset voltage.

2 more elements

An analog baseband processor for providing DC offset compensation, comprising:

a first converter for converting an intermediate frequency (IF) signal into an analog baseband signal;
and
a DC offset compensation processor for generating a first DC offset compensation signal to preset a DC offset voltage of the analog baseband signal in response to a first control signal, and for generating a second DC offset compensation signal to re-preset a DC offset voltage of the analog baseband signal in response to a second control signal, wherein the second DC offset compensation signal is generated from the first DC offset compensation signal and a third DC offset compensation signal, the third DC offset compensation signal being generated externally to the analog baseband processor and used for compensating the DC offset voltage of the analog baseband signal subsequent to preset and re-preset of the DC offset voltage.

Dependencies are inferred from the claim text.

Mobile communication system with offset compensation circuitry

Life of this patent

Mobile communication system with offset compensation circuitry

Life of this patent

Abstract

Claims15