register and starts the.mif streaming operation, the Altera PLL Reconfig IP core signals the.mif reader to begin the operation. You can only assert the phase_en signal after the phase_done signal goes from low to high. The phase noise can be separated into the contributing portions of each component/circuit and includes the reference noise, the phase frequency detector noise, the VCO noise, and wideband noise (due to amplifiers/buffers and other internal circuitry) that establishes the out-of-band phase noise floor. Brennan, Phase-Locked Loops; Principle and Practice, MAC-millan Press, 1996. You can use the Altera PLL Reconfig IP core to enable reconfiguration circuitry in the Altera PLL IP core instantiation in your design. Type the following command to stitch writing a service project proposal two.mif files (for example.mif and.mif) into output. Each phase_en pulse enables one phase shift. One final note is that since the phase noise floor is not dependent on spurious components, both the frac-N and integer-N PLLs have a similar value. These keywords were added by machine and not by the authors.
Altera recommends resynchronizing the fractional PLL using the areset signal if the phase relationship between output clocks is important. Click here for our complete line of PLL synthesizers. Conley, A Multiple Modulator Fractional Divider, Transactions of the Forty-Fourth Annual Symposium on Frequency control, 1990,. 3 K counter reconfiguration is effective only when you configure the PLL in fractional mode prior to reconfiguration.
Fractional -N PLL synthesizer, one must consider the significance of the total phase noise, cost.
The loop bandwidth of a fractional -N PLL is a desirable parameter for many applications.
A wide bandwidth allows a significant attenuation of phase noise.
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Changing the M or N counter values affect all the output clock frequencies. In waitrequest mode, the mgmt_waitrequest signal deasserts when PLL reconfiguration is complete. Chapter 497 Downloads, abstract, this paper presents an overview of the fractional-N frequency synthesis technique. Avalon-MM writes to the charge pump setting register (address0x09) to reconfigure the charge pump setting to medium bandwidth. Switch B This command reconfigures the N counter to 4 (high_count 2, low_count 2). Specify the element and its new value through life with god essay an Avalon write operation. When present, the mgmt_write_data bus requires write data. With regard to complexity, our. The design example uses a 5sgxea7 device. Google Scholar 3,. When the Altera PLL Reconfig IP core asserts this signal, the IP core ignores read or write operations.