Power detection circuit in radio frequency front-end chip
A radio frequency front-end, power detection technology, used in power testing, electrical components, generating electrical pulses, etc., can solve the problems of increasing circuit complexity, multi-chip area, increasing energy consumption, etc., reducing chip area and simple circuit structure. , the effect of reducing energy consumption
Active Publication Date: 2019-05-10
RDA MICROELECTRONICS TECH SHANGHAI CO LTD
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Problems solved by technology
[0010] When the existing power detection circuit 3 is realized, the delay circuit 32 usually adopts an RC delay circuit with resistance and capacitance, which consumes more chip area; the comparator 33 used for voltage judgment is usually realized by an operational amplifier, which increases The complexity of the entire circuit is increased, and the comparator 33 still needs to consume unnecessary current (that is, the static operating current) during the normal execution of the MIPI control signal after the MIPI control module 2 resets, thereby increasing energy consumption
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[0035] see image 3 , which is a power detection circuit in a radio frequency front-end chip provided by this application. The power detection circuit 3 includes a delay circuit 32 and a comparator 33, and its working principle of sending a reset signal reset during the power-on process of the power supply line VIO is as follows. During the power-on process of the power supply line VIO, the delay circuit 32 generates a following voltage Vdelay lagging behind the power supply voltage VIO on the power supply line VIO. The power supply voltage VIO and the following voltage Vdelay serve as two inputs of the comparator 33 . During the delay period, the follower voltage Vdelay is lower than the power supply voltage VIO, the reset signal reset output by the comparator 33 is at a valid low level, and the MIPI control module 2 will perform a reset. After the delay, the following voltage Vdelay is finally equal to the power supply voltage VIO, and the reset signal reset output by the ...
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The invention discloses a power detection circuit in a radio frequency front-end chip. The radio frequency front-end chip has an MIPI control module. The power detection circuit comprises a delay circuit and a comparator. The delay circuit is used for generating a following voltage lagging behind a power supply voltage of the radio frequency front-end chip during the power-on process of the radiofrequency front-end chip. The comparator compares the following voltage with a comparison threshold voltage and sends a reset signal to the MIPI control module. Compared with the power detection circuit in an existing radio frequency front-end chip, the power detection circuit in the invention saves a reference voltage circuit, thereby reducing chip area occupied by the power detection circuit andreducing chip manufacturing cost. Besides, all devices in the delay circuit are realized based on CMOS technology, so that chip occupation area is small; and the comparator is realized through the asymmetric phase inverter, thereby reducing or even avoiding static working current and reducing energy consumption.
Description
technical field [0001] The present application relates to a radio frequency front-end chip controlled by the MIPI RFFE protocol, in particular to a power detection circuit in the radio frequency front-end chip. The power detection circuit is used to send a reset signal to the MIPI control module when it is powered on. Background technique [0002] RF front end refers to all circuit devices integrated between the antenna and at least one mixing stage. A typical RF front-end module usually includes: antenna tuner (Antenna Tuner), antenna switch (AntennaSwitch), duplexer (diplexer) for frequency division multiplexing (FDM) system, transceiver switch for time division multiplexing system ( T / R Switch), various filters, low-noise amplifier (LNA, low-noice amplifier) and down-conversion mixer for processing received signals, up-conversion mixer and power amplifier for processing transmitted signals, Local oscillator (LO, localoscillator), etc. Due to performance and cost fact...
Claims
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Login to View More IPC IPC(8): G01R31/40G06K19/07H03K3/012H04B1/04H04B1/16
Inventor 刘刚赵鹏张春栋刘冠山郭天生贾斌
Owner RDA MICROELECTRONICS TECH SHANGHAI CO LTD