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This article presents the design of a variable gain amplifier (VGA) with a new control circuitry, enabling a linear control of the gain while ensuring input return loss matching. While changing the gain by 47dB, the phase is less than 4°, making this VGA a suitable building block for multi-antenna frontends. The VGA together with the novel control circuitry was implemented in a 180nm CMOS process...
In this article a fully differential CMOS attenuator with automatic matching and control linearization is presented. The circuit was measured from 100 MHz to 10 GHz and exhibits a phase variation of only 4° within an attenuation control range of 30 dB. The maximum gain control range is almost 50 dB. The control circuitry draws less than 500 µA from a 1.8 V supply. The circuit was fabricated in 0.18...
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