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This paper presents a 5.2-GHz adaptively-biased variable gain- low noise amplifier (VG-LNA) using SiGe BiCMOS technology. Usage of bias and gain control simultaneously to achieve high input-referred third-order intercept point (IIP3) is demonstrated. A charge pump is used to transform the RF output signal of LNA to dc control signal. Measurement results show that with 3.3V power supply, the LNA exhibits...
A programmable gain amplifier (PGA) with a novel DC offset cancellation (DCOC) technique for IEEE 802.11b/g wireless LAN direct-conversion receiver (DCR) is presented. An operational amplifier (OPAMP) utilizing an improved Miller compensation approach is adopted in this PGA design. A gain tuning range of 0 dB to 56 dB with 2 dB per step is achieved. The DCOC loop is based on a voltage-current negative...
This letter presents a low noise amplifier (LNA) RFIC with notch filter implemented in a 0.13 μm SiGe BiCMOS technology. The LNA/filter combination utilizes Q-enhanced techniques to achieve a high gain and high image rejection ratio (IRR) simultaneously. The amplifier operates at 7.27 GHz and achieves 22.5 dB gain with an IIR of 70 dB. The measured noise figure and IIP3 of the LNA are better than...
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