Phase-locked circuits and radio communication equipment

Abstract

The invention discloses a phase-locking circuit, comprising: a phase-locking part, including a voltage-controlled oscillator having a capacitor group and changing the oscillation frequency according to voltage information, and the phase-locking part locks the oscillation signal of the voltage-controlled oscillator into phase to a reference signal; and a calibration section having a voltage correction function for providing an appropriate calibration voltage to the voltage-controlled oscillator when frequency calibration is performed on the voltage-controlled oscillator; the calibration section includes a counter circuit, a first A storage circuit and a second storage circuit, a comparator circuit, a control circuit, a voltage generating circuit, and a processing circuit.

Description

technical field [0001] The present disclosure relates to a phase-locked circuit and a radio communication device, which include a calibration circuit with a voltage correction function for supplying a voltage-controlled oscillator with an appropriate calibration voltage. Background technique [0002] Now, in RF transceivers, frequency synthesizers may be essential as local oscillators that can achieve high-precision output frequencies. [0003] figure 1 is a diagram showing a typical configuration of an RF transceiver. [0004] figure 2 is showing figure 1 A diagram of a typical configuration of a PLL (frequency synthesizer) in . [0005] figure 1 The RF transceiver 1 has an antenna 2, a low noise amplifier (LNA) 3, a power amplifier (PA) 4, filters 5 and 6, mixers 7 and 8, and a phase lock circuit (PLL: lock phase ring) 9. [0006] figure 2 The PLL 9 has a phase comparator (phase frequency detector: PFD) 10 , a charge pump (CP) 11 , and a loop filter (LF) 12 . ...

AI Technical Summary

Problems solved by technology

[0059] It is very important that the wrong frequency band is not selected in this frequency calibration

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