Yeah, saw it at EDN:
"Jeff Berman, News Editor -- EDN, 1/26/2005
[snip]The new amplifiers, AD1990, AD1992, AD1994, and AD1996, deliver audiophile sound quality with less than 0.0005% total harmonic distortion plus noise, as much as 40W of output power per channel with at least a 30% heat reduction, and a dynamic range greater than 101 dB. The amps comprise power-stage-design capability, advanced sigma-delta modulator, closed-loop-feedback topology, and advanced mixed-signal and power and digital CMOS processes.
"Using sigma in a closed loop gives the best performance, and closed loop is important because it gives nonlinearity in output," Slattery says. "In the past, many Class Ds have used an open loop, which is self-limiting after a certain point." These amplifiers are instrumental in fixing design issues in HDTV and home-theater systems with lower EMI, resulting in lowered interference with other electronic equipment. The amplifiers are currently available for sampling, and full production quantities will be available in April. Sample prices range from $2.90 to $6.72 (1000)."
Jan Didden
"Jeff Berman, News Editor -- EDN, 1/26/2005
[snip]The new amplifiers, AD1990, AD1992, AD1994, and AD1996, deliver audiophile sound quality with less than 0.0005% total harmonic distortion plus noise, as much as 40W of output power per channel with at least a 30% heat reduction, and a dynamic range greater than 101 dB. The amps comprise power-stage-design capability, advanced sigma-delta modulator, closed-loop-feedback topology, and advanced mixed-signal and power and digital CMOS processes.
"Using sigma in a closed loop gives the best performance, and closed loop is important because it gives nonlinearity in output," Slattery says. "In the past, many Class Ds have used an open loop, which is self-limiting after a certain point." These amplifiers are instrumental in fixing design issues in HDTV and home-theater systems with lower EMI, resulting in lowered interference with other electronic equipment. The amplifiers are currently available for sampling, and full production quantities will be available in April. Sample prices range from $2.90 to $6.72 (1000)."
Jan Didden
You put together the the advantages and disadvantages of delta-sigma modulation class-d amps in one short sentence.
BTW: Post-filter NFB is also possible with SD architectures. Most IC manufacturers' target market is multimedia anyway, where no one cares about such details like post-filter NFB.
Regards
Charles
Sanyo/ICE Power chip
I have had an amp board with the Sanyo/ICE Power chip in my hands, at the Las Vegas Hilton during CES, in the ICE Power suite and again in New York City during AES. But the delivery date seems to keep slipping. I'm promised samples now some time in 2Q 2005. Meanwhile we keep on using the 100A and 500A.
I have had an amp board with the Sanyo/ICE Power chip in my hands, at the Las Vegas Hilton during CES, in the ICE Power suite and again in New York City during AES. But the delivery date seems to keep slipping. I'm promised samples now some time in 2Q 2005. Meanwhile we keep on using the 100A and 500A.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.