Integrated Stereo Sigma-Delta Class D Amplifier
A 2x40W integrated stereo sigma-delta class D amplifier with 100 dB SNR is realized in 0.6um BCDMOS technology. Feedback from power stage outputs gives 0.001% THD and 65dB PSRR. Modulator clock rate is 6 MHz, but dynamically adjusted quantizer hysteresis reduces output data rate to 450 kHz, helping achieve 88% efficiency. At AM radio frequencies, the modulator output spectrum contains a single peak related to the hysteresis, but is otherwise tone-free, unlike PWM modulators which contain many harmonics of the PWM clock frequency.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is temporarily free for AES members.