| Citation: |
Wang Ziqiang, Chi Baoyong, Wang Zhihua. A CMOS Wideband Variable Gain Amplifier[J]. Journal of Semiconductors, 2005, In Press.
Wang Z Q, Chi B Y, Wang Z H. A CMOS Wideband Variable Gain Amplifier[J]. Chin. J. Semicond., 2005, 26(12): 2401.
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A CMOS Wideband Variable Gain Amplifier
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Abstract
A CMOS wideband low power variable gain amplifier (VGA) is presented.The frequency response of a common source amplifier that makes use of a source degeneration resistor is analyzed.The bandwidth of the amplifier is enlarged without extra power consumption by adding compensation capacitors to change the location of the poles and zeros.The voltage peaking that appeared at low gain is solved and the linearity is improved by using a gm-boost circuit.The VGA is designed using TSMC 0.25μm CMOS technology.Simulation results show that the VGA core consumes 3.15mW at 3.3V supply voltage and has a gain range from 0 to 40dB.Its 3dB bandwidth is larger than 340MHz and OIP3 is higher than 3.5dBm with a 5pF load.-
Keywords:
- variable gain amplifier,
- CMOS,
- wideband
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References
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