The figure below illustrates an actual frequency synthesizer that utilizes the Q2230 excitation phase-locked frequency multiplier system. The system operates with a 40 MHz reference clock, allowing it to generate a sine wave with a frequency range from DC to 15 MHz, offering a resolution of 0.01 Hz and a peak-to-peak voltage of 10 V. The spectral purity of the output is better than 70 dBc, and it can also produce TTL signals across a broader range, from DC up to 60 MHz. In addition, the synthesizer supports various modulation formats such as AM, FM, FSK, and DPSK. Durable Full-Range Speakers,Performance Full Range Speaker,Steel Concert Speaker,Flexible Speaker Horn NINGBO RFUN AUDIO TECHNOLOGY CO.,LTD , https://www.mosensound.com
1. 40 MHz High Stability Reference Clock
Ensuring high-quality signal output, the 40 MHz clock is derived from a 8-degree PLL system that uses a 5 MHz constant temperature crystal oscillator (with stability better than 10-9/s). The PLL's VCO is based on a 40 MHz crystal oscillator, which guarantees excellent spectral purity and frequency stability for the system clock.
2. Microprocessor Control System
The control system is centered around the 8031 microcontroller and includes a keyboard display unit, a serial communication port, and a CPU unit. It manages various functions such as modulation control (FM, FSK, DPSK), amplitude control via DAC, DC offset adjustment, level comparison, and output switching. It also handles panel functions and display controls, making the system highly versatile and user-friendly.
3. TTL Comparator
TTL Comparator A provides a DC to 15 MHz TTL-level output. The TTL signal from Comparator B is fed back to the CPU unit and the level comparison DAC, ensuring accurate amplitude control of the sinusoidal output and maintaining the standard function of the signal generator.
4. 15–60 MHz PLL System
The 15–60 MHz range is generated using a 4x phase-locked loop system. With appropriate switching control, the system can provide TTL signals from DC to 60 MHz at the TTL output, expanding its application versatility in various test and measurement scenarios.