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A switched gain wideband differential low noise amplifier (LNA) for the 3.1-5 GHz ultra-wideband (UWB) system is presented. Techniques including serial gate peaking, load shunt peaking, RC feedback networks are used to achieve wideband input matching and large gain bandwidth. To satisfy the requirement of different input power levels, the circuit is designed with two gain mode: high gain mode(HG)...
We report a novel PIN diode SiGe HBT variable gain amplifier (VGA) suited for the standard of WCDMA. The PIN diode which is employed in the feedback loop of the VGA play as a variable resistor to realize the gain control function. By adjusting the bias of the diode, the gain of the VGA can be changed. An inductor is utilized in the feedback loop to reduce the noise figure of the circuit. After matching...
This paper presents a SiGe HBT low noise amplifier (LNA) using resistive feedback scheme for ultra-wideband (UWB) applications. This amplifier is implemented in 0.35 um SiGe process and is unconditionally stable. The simulated results show the LNA has over 21 dB gain with less than 1 dB variation over 3-10 GHz. The matched input and output reflection are all less than -10 dB. The noise figure is 4...
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