Mixer with self-calibrating carrier leakage mechanism

Details Mixer with self-calibrating carrier leakage mechanism Mixer with self-calibrating carrier leakage mechanism

2007-02-16

2009-10-13

Urban, Edward (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S232100, C361S093100, C330S252000

Reexamination Certificate

active

07603096

ABSTRACT:
An embodiment of a mixer with carrier leakage self-calibrating is disclosed. The mixer comprises a double balanced mixer, a gm stage comprising a first processing unit and a second processing unit, a current duplicating circuit, a capacitor, a controller and a current compensation unit. The current duplicating circuit selects the first processing unit or the second processing unit and duplicates a duplicated current of the selected processing unit to charge the capacitor. The capacitor has a first terminal and a second terminal, wherein the second terminal is grounded and the first terminal receives the duplicated current. The controller determines a charge time of the capacitor to generate a compensation signal, wherein the charge time is the time that the voltage of the capacitor is charged to equal to a reference voltage. The current compensation unit receives the compensation signal to generate a compensation current to the mixer.

REFERENCES:
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patent: 7027793 (2006-04-01), Gard et al.
patent: 7193466 (2007-03-01), Kim et al.
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“A 2.4GHz CMOS Transceiver and Baseband Processor Chipset for 802.11b Wireless LAN Application” Chien et al., 2003.

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