A Highly Linear 125-MHz CMOS Switched-Resistor Programmable-Gain Amplifier

Cheng Chung Hsu*, Jieh-Tsorng Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

99 Scopus citations


A highly linear programmable-gain amplifier (PGA) is fabricated using a 0.35-μm CMOS technology. High linearity and constant wide bandwidth are achieved by using a high-gain amplifier with low input impedance and resistor-network feedback. The voltage gain is varied by digitally controlling the input switched resistors. The distortion of a switched resistor has been analyzed using the Volterra series. The PGA has a voltage gain varying from 0 to 19 dB, while maintaining a constant bandwidth of 125 MHz. The third-order intermodulation distortion is -86 dB at 10 MHz. The circuit dissipates 21 mW from a 3.3-V supply.

Original languageEnglish
Pages (from-to)1663-1670
Number of pages8
JournalIEEE Journal of Solid-State Circuits
Issue number10
StatePublished - 1 Oct 2003


  • Distortion
  • Programmable-gain amplifier (PGA)
  • Switched resistor
  • Variable-gain amplifier (VGA)


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