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The IIP2 requirement in fully integrated direct-conversion receivers using FDD duplexing is prohibitively high and demands the use of an external filter in order to attenuate the leakage from the transmitter. This paper presents a digital calibration technique for passive CMOS down-converters that allows a direct conversion receiver achieve the requirements without external filtering. A Least-Mean-Square...
In this paper a low-power design of an integrated RF receiver for Wireless Sensor Networks (WSNs) in 90 nm CMOS technology is proposed. The receiver is IEEE 802.15.4 physical specifications compliant. It is designed to operate in ISM band at 2.45 GHz center frequency. Target devices for this kind of transceiver are low-cost battery powered smart embedded devices and sensors. The receiver is designed...
This paper presents a new digital calibration technique that allows CMOS Gilbert cell down-conversion mixers to meet their block specifications under large process, temperature and power supply variations. The gain and IIP3 are calibrated by regulating the current of the input differential pair and by switching the loads. IIP2 calibration is achieved by using a novel technique that consists of offset...
This paper presents a new digital calibration methodology that allows CMOS Gilbert cell down-converters to meet their block specifications under large process, temperature and power supply variations. The calibration method consists of a novel built-in self test for direct conversion receivers that is able to measure the gain, and the second and third order intermodulation products of the mixer. A...
A new method to enhance the IIP2 of a double-balanced Gilbert cell mixer through digital calibration is presented. The IIP2 calibration method consists of offset voltage cancellation in the switching pairs. The effectiveness of the method has been proven by calibrating a 0.18 mum CMOS mixer at several combinations of worst-case mismatch conditions and corners. It has been found that the calibrated...
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