Hackaday9 年
Logic Noise: 4046 Voltage-Controlled Oscillator, Part One
The first is the direct sample and hold circuit. When the sample and hold oscillator is high, and the switch is closed, the VCO tracks the pitch oscillator, and when the S&H oscillator goes low ...
Hackaday9 年
Logic Noise: Digital To Analog With An R-2R DAC
Tuning up circuits like this is tricky, and we may have to bend the only-logic-chip rules a little bit, but it’ll be worth it because I have a fantastic shift-register plus DAC plus VCO circuit ...
Design-Reuse2 年
Silicon-Accurate Fractional-N PLL Design
Periodic Noise Analysis for periodic blocks. Transient Noise Analysis for all circuits, including the closed-loop PLL. In a well-designed PLL the VCO is the dominant noise source. Periodic Noise ...
Design-Reuse1 年
Wide band PLL - 3GHz-6GHz
63 times lower than reference. VCO frequency N-divider has rogrammable coefficient of division with step 1 in range 4 to 2047 modulated with 4-order 24bit DSM. Phase-frequency detector has built-in ...