Title :
A power-efficient, low-distortion variable gain amplifier consisting of coupled differential pairs
Author :
van Lieshout, Pieter J G ; Van De Plassche, Rudy J.
Author_Institution :
Philips Res. Lab., Eindhoven, Netherlands
fDate :
12/1/1997 12:00:00 AM
Abstract :
A variable gain amplifier incorporating a plurality of coupled differential pairs has been designed in a bipolar technology. By applying variable offset voltages to these differential pairs, the overall gain of the system can be varied. The linear input region is inversely proportional to gain, making the amplifier very well suited for automatic gain control circuits. Furthermore, the gain of the proposed amplifier is 0-25 dB, the signal bandwidth is 35 MHz, and the output IP3 is 24-30 dBm. It operates from a 5 V power supply and dissipates 40 mW. The active chip area is 0.15 mm2 in a 1 μm bipolar technology
Keywords :
automatic gain control; bipolar analogue integrated circuits; differential amplifiers; electric distortion; wideband amplifiers; 0 to 25 dB; 1 micron; 35 MHz; 40 mW; 5 V; AGC circuits; automatic gain control circuits; bipolar technology; coupled differential pairs; low-distortion amplifier; power-efficient amplifier; variable gain amplifier; Bandwidth; Coupling circuits; Differential amplifiers; Gain control; Laboratories; Power supplies; Tail; Transconductance; Transfer functions; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
