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Proceedings ArticleDOI
Ruiheng Wu, Chen Wang 
03 Sep 2008
2 Citations
The simulation results have demonstrated that stable circuit behavior for the amplifier can be achieved.
Gain and input and output characteristics of the unilateralized high-frequency amplifier may be predicted easily from the transistor parameters (both emitter input and base input connection) in a frequency range below the alpha cutoff frequency.
The proposed amplifier utilizes positive feedback to achieve a large gain at high speed, which can be difficult to achieve with other dynamic amplifier topologies.
This technique is effective to improve a 100 MHz-1 GHz frequency characteristic of the amplifier.
Both measured frequency and transient step response show that the amplifier is stable.
The simulation and measurement results verify that the saturated amplifier is suitable for a high-efficiency PA over a relatively high frequency band.
It is shown that these expressions simplify the tradeoff considerations for broadband low noise amplifier design by avoiding the need to draw several constant noise and gain circles at each frequency of interest.
Experimental results demonstrate the utility of the new amplifier design.
Experimental results demonstrate that the amplifier can be used for dynamic and static applications and low frequency bandwidths can also be achieved.
Finally, we present a very high-speed and high-swing amplifier suitable for low-voltage applications.

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