Title :
A low-power low-noise accurate linear-in-dB variable-gain amplifier with 500-MHz bandwidth
Author :
Otaka, Shoji ; Takemura, Gaku ; Tanimoto, Hiroshi
Author_Institution :
Corp. Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan
Abstract :
A linear-in-dB variable-gain amplifier (VGA) using a pre-distortion circuit to generate the gain-control signal is fabricated in a BiCMOS process with f/sub T/=20 GHz. The VGA comprises two cascaded stages of signal-summing VGA and has a variable-gain range of over 70 dB. It can operate at up to 500 MHz and dissipates 36 mW from a 3-V supply. A noise figure of below 5 dB and IIP3 of over -38 dBm at 43-dB gain were obtained. The VGA achieved a gain error of less than 2 dB over 70-dB gain range, and it occupies approximately 1 mm/sup 2/. The VGA is applicable to future code division multiple access (CDMA) receivers.
Keywords :
BiCMOS analogue integrated circuits; UHF amplifiers; UHF integrated circuits; compensation; gain control; integrated circuit noise; wideband amplifiers; 20 GHz; 3 V; 36 mW; 500 MHz; 70 dB; BiCMOS process; CDMA receiver application; cascaded stages; code division multiple access receivers; gain-control signal; linear-in-dB variable gain amplifier; low-noise amplifier; low-power LNA; pre-distortion circuit; signal-summing VGA; Band pass filters; Bandwidth; Circuits; Frequency; Insertion loss; Low-noise amplifiers; Multiaccess communication; Narrowband; Signal generators; Signal processing;
Journal_Title :
Solid-State Circuits, IEEE Journal of
