A new GaAs variable-gain amplifier MMIC with a wide-dynamic-range and low-voltage-operation linear attenuation circuit

A variable‐gain amplifier for an adaptive antenna at the ISM band is presented. The amplifier consists of three stages and has a digital control. The device is made on a printed circuit board. The amplifier's maximum gain, noise figure, and output compression point are 31.2 dB, 5 dB, and 8.6 dBm, respectively. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 82–85, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20054

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A GaAs monolithic linear‐in‐dB wide‐dynamic‐range variable‐gain amplifier with matching compensation for 1.95‐GHz applications

Detratti

Pascual

Fuente

et al. 2004

Micro & Optical Tech Letters

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This paper describes a method to design a compact linear‐in‐dB variable‐gain amplifier (VGA) with good input/output matching in a wide gain‐control range. The method is theoretically supported and has been validated with the design of a 1.95‐GHz GaAs fully monolithic VGA. Measured maximum gain is 18.8 dB with associated noise figure of 6.3 dB and 40‐dB dynamic range with lower than ±1.5‐dB deviation from linearity, under a low control voltage from −0.4 V to −1.5 V. Good linearity with an output 1‐dB compression of 12 dBm at maximum gain and associated 3rd‐order intercept point better than 22 dBm are also shown. The adjacent channel power ratio (ACPR) was measured at the 1.95‐GHz WCDMA band, showing values better than −48 dBc at 885‐KHz offset and −70 dBc at 1.98‐Mhz offset over the whole control range. The chip size is 2 × 1.0 mm2 and consumes only 34 mA from a supply voltage of 3.5 V. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 251–257, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20602

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A new GaAs variable-gain amplifier MMIC with a wide-dynamic-range and low-voltage-operation linear attenuation circuit

Cited by 10 publications

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Variable‐gain amplifier for adaptive antenna control at the 2.4‐GHz ISM‐band

A GaAs monolithic linear‐in‐dB wide‐dynamic‐range variable‐gain amplifier with matching compensation for 1.95‐GHz applications

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