Title :
A compact bipolar class-HB output stage using 1-V power supply
Author_Institution :
Philips Res. Lab., Eindhoven, Netherlands
fDate :
12/1/1992 12:00:00 AM
Abstract :
A compact circuit topology for the realization of a bipolar class-HB output stage operating down to 0.9 V is presented. This compact topology is obtained by using the same path for the signal as well as for the definition of the bias current in the output transistors. The output amplifier is used to drive a 64-Ω load, representing the series connection of two telephones in a headphone set. An output signal of 600 mVp-p across the 64-Ω load at a supply voltage of 1.3 V shows a total harmonic distortion plus noise better than -60 dB. The amplifier uses 0.14-mm2 chip area and is realized in a 2.5-μm BiCMOS process including vertical p-n-p transistors
Keywords :
BiCMOS integrated circuits; audio-frequency amplifiers; linear integrated circuits; 0.9 to 1.3 V; 1-V power supply; 2.5 micron; BiCMOS process; bipolar class-HB output stage; compact circuit topology; vertical p-n-p transistors; Batteries; Circuit topology; Current supplies; Diodes; Headphones; Low voltage; Power supplies; Stacking; Telephony; Total harmonic distortion;
Journal_Title :
Solid-State Circuits, IEEE Journal of
