A highly linear 125-MHz CMOS switched-resistor programmable-gain amplifier

A highly linear 125-MHz CMOS switched-resistor programmable-gain amplifier

A highly linear programmable-gain amplifier (PGA) is fabricated using a 0.35-/spl mu/m 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 t...

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Veröffentlicht in:IEEE journal of solid-state circuits 2003-10, Vol.38 (10), p.1663-1670
Hauptverfasser: Hsu, Cheng-Chung, Wu, Jieh-Tsorng
Format: Artikel
Sprache:eng
Schlagworte:
Amplifiers
Bandwidth
Circuits
CMOS
CMOS technology
Digital control
Distortion
Electronics packaging
Feedback
Impedance
Intermodulation distortion
Linearity
Noise levels
Resistors
Voltage control
Voltage gain
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Beschreibung
Zusammenfassung:A highly linear programmable-gain amplifier (PGA) is fabricated using a 0.35-/spl mu/m 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 -86dB at 10 MHz. The circuit dissipates 21 mW from a 3.3-V supply.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2003.817665