Frequency-adjustable charge pump unit, chip and communication terminal

Abstract

The invention discloses a frequency-adjustable charge pump unit, a chip and a communication terminal. The charge pump unit includes a frequency variable signal generator, a charge pump circuit and a voltage detector which are connected with one another sequentially; the frequency variable signal generator outputs clock signals for the charge pump circuit; the charge pump circuit generates output voltage according to the clock signals; the output voltage, on the one hand, drives a load, and on the other hand is connected with the voltage detector; and the output end of the voltage detector is connected with the frequency variable signal generator. With the frequency-adjustable charge pump unit of the invention, the working frequency of the frequency variable signal generator can be dynamically adjusted according to the requirement of the working state of a radio frequency system for the driving output of the charge pump unit, and therefore, practical demands for on-demand load driving and noise interference reduction of the radio frequency system can be satisfied simultaneously.

Description

technical field [0001] The invention relates to a charge pump unit with adjustable frequency, a radio frequency switch control method using the charge pump unit, an integrated circuit chip using the charge pump unit and a corresponding communication terminal, belonging to the technical field of integrated circuits. Background technique [0002] With the continuous improvement of the integration of wireless communication systems, the use of radio frequency switches is increasing day by day. In order to ensure that the radio frequency signal can still ensure that the signal noise does not deteriorate after passing through multiple radio frequency switches, it is necessary to put forward higher and higher requirements for the low noise design of the radio frequency switch. [0003] As we all know, square wave signals will generate harmonic components in a wide frequency band, so square wave signals such as clocks should be avoided as much as possible in radio frequency (RF) sys...

AI Technical Summary

Problems solved by technology

In the prior art, the operating frequency is generally a fixed value, and the compromise between speed and operating frequency cannot be considered

Moreover, conventional charge pump units cannot actively adjust the operating frequency of the circuit according to its load conditions

This is because it works in an open-loop mode, the charge pump itself cannot sense the change of its load, and thus cannot independently adjust its operating frequency

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