The design of a 3-V 900-MHz CMOS bandpass amplifier

Chung-Yu Wu*, Shuo Yuan Hsiao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

71 Scopus citations


A new bandpass amplifier which performs both functions of low-noise amplifier (LNA) and bandpass filter (BPF) is proposed for the application of 900-MHz RF front-end in wireless receivers. In the proposed amplifier, the positive-feedback Q-enhancement technique is used to overcome the low-gain low-Q characteristics of the CMOS tuned amplifier. The Miller-capacitance tuning scheme is used to compensate for the process variations of center frequency. Using the high-Q bandpass amplifier in the receivers, the conventional bulky off-chip filter is not required. An experimental chip fabricated by 0.8-μm N-well double-poly-double-metal CMOS technology occupies 2.6 × 2.0 mm 2 chip area. Under a 3 V supply voltage, the measured quality factor is tunable between 2.2 and 44. When the quality factor is tuned at Q = 30, the measured center frequency of the amplifier is tunable between 869-893 MHz with power gain 17 dB, noise figure 6.0 dB, output 1 dB compression point at -30 dBm, third-order input intercept point at - 14 dBm, and power dissipation 78 mW.

Original languageEnglish
Pages (from-to)159-168
Number of pages10
JournalIEEE Journal of Solid-State Circuits
Issue number2
StatePublished - 1 Feb 1997


  • Bandpass amplifier
  • Bandpass filter
  • CMOS technology
  • Integrated inductor
  • Low-noise amplifier
  • Mobile communication
  • Radio frequency
  • Wireless receiver

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