Negative voltage generation circuit

Abstract

The invention discloses a negative voltage generation circuit used for a radio frequency antenna switch. The negative voltage generation circuit comprises a detection module used for detecting logic signals of a radio frequency antenna switch, and recognizing an enable signal in the logic signals; a control module used for generating an oscillator control signal according to the enable signal in the logic signals of the radio frequency antenna switch; an oscillator working at a normal power consumption mode or a power saving mode under control of the oscillator control signal to generate a clock signal, wherein the oscillator works at the normal power consumption mode if the enable signal is effective, and otherwise the oscillator works at the power saving mode; and a charge pump used for responding to the clock signal to convert an external DC voltage source into a negative voltage. The power consumption of the oscillator in the negative voltage generation circuit can be reduced, an output voltage of the negative voltage generation circuit is stable, and a better transient response is achieved.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a negative voltage generating circuit for a radio frequency antenna switch. Background technique [0002] With the continuous promotion of emerging communication technologies, 3G and 4G communication technologies have become the mainstream of communication technologies. In new mobile communication devices, more modes and more frequency bands need to be supported, so a more complex radio frequency system is required. In complex RF communication systems, 2-level or multi-level RF antenna switches are required, and the switch needs to support up to 16 frequency bands, that is, the switch requires 16 RF channels, which means larger chip area and higher design difficulty . Under such conditions, the performance of the RF antenna switch has a more pronounced impact on the RF system. Especially at high transmit power, the low insertion loss of the RF antenna switch saves...

AI Technical Summary

Problems solved by technology

[0005] However, after adding a negative voltage circuit to the antenna switch, it is necessary to set up many level conversion circuits for logic signal processing. When the input logic signal is reversed, the level conversion circuit consumes a lot of power, resulting in a large overall power consumption of the RF antenna switch.

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