DC-DC converter with a characteristic for restraining harmonic noises of output frequency spectrum
A technology of DC-DC and noise characteristics, applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problems of complex modulator circuit structure, increase of overall circuit area and power consumption, etc. , to achieve the effect of reducing power consumption and area, and simplifying the structure
Inactive Publication Date: 2015-11-25
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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However, its modulator circuit structure is relatively complex, which increases the overall circuit area and power consumption.
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[0018] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:
[0019] A kind of DC-DC converter of the present invention has the characteristic of suppressing output spectrum harmonic noise, such as image 3 As shown, it includes PMOS power transistor MP, NMOS power transistor MN, NMOS transistor MN1, inductor L, first capacitor C, second capacitor Cc, third capacitor C1, operational amplifier, first transconductance amplifier OTA1, second transconductance Amplifier OTA2, first resistor R1, second resistor R2, third resistor R, fourth resistor RF1, fifth resistor RF2, clocked current comparator and power tube drive module; the source of the PMOS power tube MP is connected to the power supply VIN, Its gate is connected to the first output terminal of the power tube drive module, its drain is connected to the drain of the NMOS power transistor MN, and its drain is grounded after passing through the inductor L and the first ...
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The present invention belongs to the field of power source technology, and specifically relates to a DC-DC converter with a characteristic for restraining harmonic noises of an output frequency spectrum. A main technical scheme of the present invention is that: an operational amplifier OPI, a resistance RI, a resistance R2, and a capacitance Cc constitute a phase-lead compensation module together; a first transconductance amplifier OTA1, a third capacitance C1 and an NMOS transistor constitute a phase lag compensation module together; and the phase-lead compensation module is used to output signals inputted by the phase lag compensation module and a second transconductance amplifier OTA2 according to an output sampling voltage of the RF2. The operational amplifier OPI, the resistance R1, the resistance R2, and the capacitance Cc realize the phase-lead compensation so that a whole DC-DC loop is stable. According to the invention, a structure of a second-order Sigm-Delta modulator is nested into the whole DC-DC loop so as to realize a modulation of an inconstant frequency, and simultaneously simplify a structure and reduce a power consumption and an area.
Description
technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to a DC-DC converter capable of suppressing output spectrum harmonic noise. Background technique [0002] The RF chip circuit is very sensitive to frequency noise, and the noise peaks on the frequency spectrum seriously degrade the performance of the RF circuit. Using PWM modulation type DC-DC converter (structure such as figure 1 (shown) is a relatively traditional method for powering radio frequency circuits. PWM modulation DC-DC converter has stable output voltage, small ripple, and small steady-state error. However, PWM modulation uses a fixed-period sawtooth signal, which will inevitably introduce harmonics. Wave noise is detrimental to the performance of RF circuits. Another DC-DC converter using Sigma-Delta modulation (structure such as figure 2 As shown), its modulation period is random and not fixed, and its harmonic noise is very small, so that the o...
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Login to View More IPC IPC(8): H02M1/14H02M3/156
Inventor 甄少伟杨东杰王骥曹灿华罗萍贺雅娟张波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA