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A novel SiGe HBT low noise amplifier (LNA) was designed by adopting the feedback resistors, which are low cost and implemented easily in VLSI technology. Due to the absence of on-chip spiral inductor, the die area of this novel LNA decreases noticeably. The novel resistive feedback structure of the LNA comprising a shunt feedback loop and a series feedback loop, wherein the shunt feedback loop is...
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...
A high dynamic range linear-in-dB variable gain amplifier (VGA) using SiGe HBT devices for WCDMA applications is presented in this paper. The gain is achieved through four stages of amplifiers. The first, third and the fourth stage is the normal amplify stage, and the second stage is the gain control stage. The gain control is implemented by adjusting the bias of the second amplifier. The VGA is driven...
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