A Broadband Amplifier with Huge Gain-bandwidth Product and Low Power Consumption
The invented broadband amplifier can be applied in fiber-optic communications as a modulator driver, limiting, automatic gain control and as transimpedance amplifiers. It can also be employed in various bands of frequencies as general-purpose amplifiers in wireless communication systems, in testing equipments, and in military electronics warfare systems.
University researchers have developed a design method by combining three-stage amplifier design to achieve a broadband amplifier with desirable gain, large bandwidth, low power consumption, low input/output reflection coefficients, low loss, and good reliability. Without a distributed amplifier, the invented broadband amplifier bandwidth of 1/2 of fT and/or approaching to fT can be achieved. Therefore, the amplifiers requires only fT of 1-3 times of the amplifier bandwidth in order to achieve high bandwidth. The broadband amplifier area and dc power consumption will be small and low respectively. With the invented broadband amplifier, transistors are operated with typical current density, but high amplifier bandwidth can still be achieved. Therefore, the transistors are not stressed at high current density, thus leading to better reliability and long lifecycles. Also, 50 termination is not required in the input and output broadband matching network, therefore, a 3-dB loss is avoidable. S11 can be kept low over the operating bandwidth even with DC supply varied from 0 to 3.3V, and S22 is low over the operating bandwidth as well. This advantage is very useful for broadband amplifiers, and they can be easily cascaded as well.
Patent Number: US7652539B2
Application Number: US2005264291A
Inventor: Gao, Huai | Chatchaikarn, Aroonchat | Guan, Huinan | Li, Guann-Pyng | Yang, Li-Wu | Yang, Daniel
Priority Date: 31 Oct 2005
Priority Number: US7652539B2
Application Date: 31 Oct 2005
Publication Date: 26 Jan 2010
IPC Current: H03F000368
US Class: 330311
Title: Multi-stage broadband amplifiers
Novelty: Multi-stage broadband amplifier has output stage coupled with gain stage with common collector amplifier that outputs output signal representative of amplified input signal
电子
电路设计
7652539
Tech ID/UC Case 18848/2004-232-0 Related Cases 2004-232-0
美国
