A 54.2-dB Current Gain Dynamic Range, 1.78-GHz Gain-Bandwidth Product CMOS VCCA2

A voltage-controlled current amplifier/attenuator in a standard 0.35-<inline-formula> <tex-math notation="LaTeX">${\mu }\text{m}$ </tex-math></inline-formula> CMOS technology is presented. It is based on the resistive mirror method, using non-saturated MOSFETs. An open-loop design with no compensation capacitors provides a high stability and a small occupied chip area of 0.0126 mm<sup>2</sup>. A current gain dynamic range of 513 (54.2 dB), a gain-bandwidth product of 1.78 GHz at the largest current gain of 35.9 dB, and a maximum power consumption of 250 <inline-formula> <tex-math notation="LaTeX">${\mu }\text{W}$ </tex-math></inline-formula> with a single supply voltage of 1.3 V are achieved. In addition, an AC current source has been designed, integrated on the same chip, and used as the input of the proposed voltage-controlled amplifier/attenuator.

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