| 摘要 |
The analog-to-pulse density converter of U.S. Pat. No. 3,955,191 is modified to provide high stability gain with temperature compensation, auto-centering and defined d.c. offset to reduce noise at low signal levels. The modified circuit has reduced power dissipation. The modulator has a stabilized current switching circuit feeding an RC network which is terminated by two D-type flip flops clocked by a high frequency pulse train. Negative feedback from both of the flip flops causes the circuit to generate a pulse density modulated (PDM) output signal related to a given input signal. |
