Developed a digital 1 bit FM demodulator FM-radio

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Development 2020. Based on information from Accuphase TUNER T-109V. This Advanced Differential Gate Linear (ADGL) demodulator delivers the best sound ever known, compared to quadrature and PLL by a significant margin in quality, bass and detail. With scientifically based high linearity of the pulse demodulator, it has low distortion. The circuit works on the principle of digital interference of one-bit streams. The EX-OR circuit compares them and generates standard period-modulated pulses, essentially analogous to a DSD signal. EX-OR circuit is a parity cell and physically cuts out noise, improves SNR. The scheme is not customizable and is not prone to detuning, random or over time. As part of the scheme, a completely new quality improvement unit is used: "digital pulse amplifier ", the Japanese did not install such a unit. A number of improvements to the information provided by the Japanese made it possible to significantly improve the quality and now, reasonably, this detector should play better than the Accuphase tuners, which usually take 1st place.

 

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The experiment with the 290 ns delay line turned out to be successful, the output signal level increased 3 times. 180ns is installed as standard on the board. New boards have been assembled, while I am testing how different in sound is 290ns from 180ns