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A single-stage variable-gain amplifier with 70-dB dynamic range for CDMA2000 transmit applications

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3 Author(s)
Aggarwal, S. ; Philips Semicond., San Jose, CA, USA ; Khosrowbeygi, A. ; Daanen, A.

A variable-gain amplifier (VGA) circuit is presented with a gain range of more than 70 dB in a single stage. Vertical stacking of multipliers in a single-stage VGA results in a considerable saving of power, which is a prime requirement in cellular systems. The gain-in-dB is a linear function of the control voltage and has excellent stability over temperature. The amplifier is a part of a code-division multiple access cellular transmit integrated circuit, and provides good linearity and noise characteristics over a wide range of IF frequencies. The circuit is fabricated in a 30-GHz ft BiCMOS technology and consumes 8 mA at 2.7 V.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 6 )