Title :
Low-noise tape preamplifier with new self-biasing architecture
Author :
Monti, Marco M. ; Rossi, Domenico ; Belloli, Mauro
Author_Institution :
SGS Thomson Microelectron., Milan, Italy
fDate :
7/1/1992 12:00:00 AM
Abstract :
A low-noise ground-compatible preamplifier for audio signal processing is presented. It amplifies the audio signal coming from a magnetic head producing a total input-referred voltage noise less than 300-nV r.m.s. CCIR/ARM weighted in operative conditions thanks to a low-noise bipolar amplifier, while auto-reverse, metal/normal, and mute facilities are available on chip using low-noise offset-free analog CMOS switches. Total harmonic distortion was less than 0.004% in full dynamic range. This performance was obtained using a nonconventional self-biasing ground-compatible preamplifier architecture, particularly intended for single supply applications, that does not require any external components and auxiliary voltage reference. The preamplifier occupies 1.5 mm2 and dissipates 38 mW with a 10-V power supply. A measured power supply rejection of about 120 dB at 1 kHz was obtained using internal regulated voltage supply.
Keywords :
CMOS integrated circuits; audio-frequency amplifiers; preamplifiers; 38 MW; THD; audio signal processing; input-referred voltage noise; internal regulated voltage supply; low-noise ground-compatible preamplifier; magnetic head; offset-free analog CMOS switches; power supply rejection; self-biasing architecture; single supply applications; Dynamic range; Low-noise amplifiers; Magnetic heads; Magnetic noise; Power supplies; Preamplifiers; Signal processing; Switches; Total harmonic distortion; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of