Low Power High Switching Rate Charge Pump Circuit
A technology of switching rate and charge pump, which is applied in the field of phase-locked loop, can solve the problem of multiple power consumption of the circuit, and achieve the effects of reducing leakage current, increasing the conduction threshold, and reducing leakage power consumption
Active Publication Date: 2022-01-28
GUANGDONG UNIV OF TECH
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Problems solved by technology
[0003] Some charge pump circuits with high switching rates proposed in the prior art require an external bias current, that is, different branches need to be always on, but the function of the branch is only to provide a certain operating point and the output current of the charge pump, so It will make the circuit a lot of unnecessary power consumption, especially when the required current is large and the phase-locked loop is not locked, the overall power consumption of the circuit is three times the actual useful power consumption, and when the phase-locked loop is locked He also has a constant branch that consumes current
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[0044] see figure 1 , the present invention provides a charge pump circuit with low power consumption and high switching rate, including voltage input terminals UP and DN, current output terminal IOUT, current bias input voltage terminal BIAS, first stage amplifier A1, first capacitor C1, current Adjustable MOS transistors M1, M2, M3 and M4, substrate adjustable MOS transistors M5, M6, M7 and M8, switching MOS transistors M10, M11, M12 and M13, first inverter INV1 and second inverter INV2 ,in:
[0045] The voltage input terminal UP of the charge pump circuit is coupled to the first inverter INV1 and the output of the first inverter INV1 obtains another voltage input terminal UPB. At the same time, the voltage input terminal UP is coupled to the gate of the switch MOS transistor M10 and the gate of the substrate adjustable MOS transistor M8, and the voltage input terminal UPB is coupled to the gate of another switch MOS transistor M11 and the substrate adjustable MOS transisto...
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The invention discloses a charge pump circuit with low power consumption and high switching rate, which utilizes a structure similar to a current source, so that the current of the charge pump can be self-sufficient without the need for other modules to provide it. It maintains its own function without quiescent current. In this way, when the phase-locked loop is locked, the charge pump circuit of the present invention has a little power consumption except for the amplifier itself, and other parts have no power consumption or very little power consumption. In order to reduce the leakage power consumption when the switch is closed, the present invention changes the threshold value of the switch tube by changing the substrate voltage. The turn-on threshold reduces the leakage current; in addition, the circuit of the present invention can realize self-sufficiency of current, and can adjust the size of the current by adjusting the size of the MOS tube.
Description
technical field [0001] The invention relates to the technical field of phase-locked loops, in particular to a charge pump circuit with low power consumption and high switching rate. Background technique [0002] The charge pump circuit is a circuit analog interface that connects the internal digital circuit part and the analog circuit part of the digital-analog hybrid phase-locked loop, and converts the phase difference pulse output by the frequency and phase detector into the charging and discharging current of the low-tube filter. It plays an important role in the application of conversion, motor drive and storage circuits. [0003] Some charge pump circuits with high switching rates proposed in the prior art require an external bias current, that is, different branches need to be always on, but the function of the branch is only to provide a certain operating point and the output current of the charge pump, so It will make the circuit a lot of unnecessary power consumpti...
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IPC IPC(8): H02M3/07
CPCH02M3/07H02M1/0054Y02B70/10
Inventor 钟鸣熊晓明梁润华黄泽武
Owner GUANGDONG UNIV OF TECH