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This paper presents a configurable 1/2/3 order Butterworth low pass(LP)/complex bandpass (CBP) filter for sub-GHz Applications in a 180-nm CMOS process. The filter employs operational transconductance amplifier (OTA) unit with feedforward capacitor instead of conventional two-stage amplifiers to broaden bandwidth while consuming no extra power. In order to achieve a good noise figure, extra noise...
This paper presents a five-order Butterworth low-pass filter with DC offset cancellation (DCOC) for WLAN Applications in a 65-nm CMOS process. The low-pass filter employs transconductance cell instead of conventional two-stage amplifiers to avoid internal poles which may otherwise cause the reduction of GBW. In order to achieve an appropriate 1-dB bandwidth of the integral filter, extra parasitic...
This paper presents an automatic amplitude control (AAC) loop voltage controlled oscillator (VCO) with a constant VCO gain (Kvco) for fractional-N frequency synthesizers in WLAN application in 65nm CMOS process. A novel AAC scheme based on a mixed-signal feedback loop has been proposed to minimize the amplitude variation. In order to achieve a low Kvco variation, an extra switched varactor array is...
The partially melted zone (PMZ) is a weakness region in the fusion welded joints of 2219 aluminum alloy due to the microsegregation of brittle eutectics (α(Al)+θ(Al2Cu)). The influence factors on the microstructures and mechanical properties of the PMZ in the joint have not been well understood. In this study, the microstructures of the PMZ were simulated using Gleeble thermal simulator with different...
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