Self-calibration device and method for loop parameters of phase-locked loop

Abstract

The invention discloses a self-calibration device and method for the loop parameters of a phase-locked loop. The self-calibration device comprises a phase frequency detector, a charge pump, a loop filter, a loop parameter correcting module and a main frequency divider. The phase frequency detector, the charge pump and the loop filter are sequentially connected. The loop parameter correcting module shares a common reference signal Fref input end with the phase frequency detector, and is connected to the loop filter. The main frequency divider is connected with the output end of the loop filter and passes through the main frequency detector to be fed back and input to the feedback input end of the phase frequency detector. The self-calibration device and method for the loop parameters of the phase-locked loop can overcome the defects that in the prior art, the area of a chip is large, manufacturing cost is high, and a temperature compensation effect is bad are overcome, and achieve the advantages of being small in chip area, low in manufacturing cost and good in temperature compensation effect.

Description

technical field [0001] The invention relates to the technical field of semiconductor integrated circuits, in particular to a phase-locked loop loop parameter self-calibration device and method. Background technique [0002] With the rapid development of the personal consumer mobile terminal market, wireless communication technology has been widely used. In order to transmit information reliably and effectively, it is necessary to modulate the original data. In wireless communication technology, for the transmission of digital signals, in the transceiver or transmitter structure, the digital baseband processes the transmitted data, and the output through the baseband digital modulator The modulated signal performs amplitude, frequency or phase shift keying modulation on the RF carrier signal generated by the VCO or frequency divider. The modulated signal is output by the power amplifier and transmitted through the antenna to complete the wireless transmission of the digital s...

AI Technical Summary

Problems solved by technology

The current process and technology allow the entire phase-locked loop to be integrated on the same chip. The output phase noise of the oscillator has a great relationship with the bandwidth of the filter. In order to obtain a lower phase noise, the bandwidth of the loop filter usually needs to be obtained Smaller, the resistance and capacitance values ​​in the loop filter are relatively large, which increases the area and cost of the chip; on the other hand, in the design of integrated circuits, a very important problem is process deviation, voltage fluctuation, ambient temperature (PVT ) and other factors will have a greater impact on circuit performance and consistency. Therefore, from a design point of view, it is necessary for the phase-locked loop circuit to have strong robustness and a correction circuit that suppresses the influence of factors such as PVT, because the larger resistance and capacitance It is more affected by factors such as temperature drift and process deviation, and the loop function gain and amplitude of the signal path show inconsistency. This problem needs to be solved from the design, and the existing public literature has made some attempts on the temperature compensation method. , but the effect is more limited

[0004] In the process of realizing the present invention, the inventors found that there are at least defects such as large chip area, high manufacturing cost and poor temperature compensation effect in the prior art

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