Title :
A 684-mW adaptive supply full-rate ADSL CO driver
Author :
Pierdomenico, John ; Wurcer, Scott ; Day, Bob
Author_Institution :
Analog Devices Inc., Wilmington, MA, USA
fDate :
12/1/2002 12:00:00 AM
Abstract :
A single 12-V supply ADSL line driver capable of delivering 20.4 dBm into a 100-Ω load with a crest factor of 5.3 is described. Additionally, a theoretical power consumption derivation of several classes of amplifiers driving discrete multitone (DMT) waveforms is presented. A prototype of the driver was fabricated in a high-voltage bipolar process and evaluated in both pure analog and system environments. This driver achieves 18 V of ac swing on a single supply of 12 V dc. This is achieved by combining internal circuitry with external Schottky diodes and capacitors to modulate internal supplies to 24 V during high crest factor signal processing. The total power consumption is 672 mW when driving a resistive load and 684 mW when driving 8.16 Mb/s down a 6-kft line at a bit error rate of less than 1 e-07 in a full reference design.
Keywords :
bipolar analogue integrated circuits; digital subscriber lines; driver circuits; feedback amplifiers; power amplifiers; power integrated circuits; 12 V; 24 V; 672 mW; 684 mW; 8.16 Mbit/s; Adaptive Linear Power; active termination; adaptive supply full-rate ADSL CO driver; amplifiers; bit error rate; class AB amplifiers; class G amplifiers; class H amplifiers; crest factor; discrete multitone waveforms; external Schottky diodes; full reference design; high crest factor signal processing; high-voltage bipolar process; internal circuitry; positive feedback; power consumption derivation; pure analog environments; resistive load driving; single supply ADSL line driver; total power consumption; Capacitors; Driver circuits; Energy consumption; OFDM modulation; Power amplifiers; Power dissipation; Power supplies; Prototypes; Schottky diodes; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2002.804343
