Millimeter-wave phase-locked loop

Abstract

The invention discloses a millimeter-wave phase-locked loop, which comprises a voltage-controlled oscillator, an orthogonal output injection locked frequency divider, a charge pump and a loop filter, wherein the voltage-controlled oscillator is used for generating an oscillating signal of a set frequency by adopting a differential input tuning way; the orthogonal output injection locked frequency divider is used for performing frequency division processing on the oscillating signal to output multiple paths of orthogonal frequency division signals; the charge pump is used for converting a pulse signal into an analog voltage signal for realizing differential output; the loop filter is connected between the charge pump and the voltage-controlled oscillator, and is used for filtering an analog voltage signal output by the charge pump to input into the voltage-controlled oscillator. The millimeter-wave phase-locked loop is used for supplying a local oscillator signal of a set frequency to a 60GHz millimeter-wave communication system. According to the structure of the differential tuning voltage-controlled oscillator in the phase-locked loop, the noise of the oscillator is optimized, and the noise optimization of the entire phase-locked loop is facilitated greatly. A differential input control voltage is provided for a differential voltage-controlled oscillator through the charge pump, so that higher phase noise performance is achieved.

Description

Technical field [0001] The invention relates to the field of 60GHz millimeter wave short-distance wireless communication, and in particular to a millimeter wave phase-locked loop. Background technique [0002] In the communication system, the communication bandwidth is a very important index, which basically determines the data rate of the communication system. At present, the bandwidth of most traditional applications is only a few MHz to a few hundred MHz, which is related to the low center frequency, such as the third-generation mobile communication (uplink 1.9GHz, downlink 2.1GHZ). The frequency band of millimeter wave is 30GHz~300GHz, and its wavelength is in the range of 1mm~10mm. Because its center frequency is very high, much higher than the frequency of most current traditional applications, its achievable bandwidth is also very wide, which can exceed 5GHz, which creates good conditions for high-speed data communication. Because the signal in the 60GHz band has a large...

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Problems solved by technology

[0006] Therefore, the design of the millimeter-wave phase-locked loop is a very critical circuit part in the 60GHz millimeter-wave communication system. However, in the prior art, there is no 40GHz millimeter-wave phase-locked loop circuit with better noise performance. Therefore, it is urgent Need to design a 40GHz millimeter-wave phase-locked loop with good noise performance

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