Complementary feedback-type gate switch charge pump circuit
A gate switch, charge pump technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problem of inability to meet switching speed, charge and discharge current matching, difficult to match upper and lower charge and discharge currents, charge and discharge current output voltage changes, etc. problem, to achieve the effect of improving loop stability, fast current switching speed, and ensuring current stability
Active Publication Date: 2016-11-09
SOUTHEAST UNIV
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Problems solved by technology
This brings problems such as the difficulty of matching the upper and lower charge and discharge currents, and the change of the charge and discharge current with the output voltage.
[0004] The traditional gate switch charge pump circuit obviously cannot meet the requirements of switching speed, charge and discharge current matching, etc. By adopting the structure of the output gate, the response speed of the charge and discharge current switch can be improved to a certain extent, but the problem of current mismatch cannot be solved.
Feedback from the operational amplifier to the substrate or gate of the current tube can ensure the matching of the charge and discharge current to a certain extent, but the charge and discharge current will still change with the output level
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[0023] The present invention will be further described below in conjunction with the accompanying drawings.
[0024] figure 1 Shown is a complementary feedback gate switch charge pump circuit of the present invention, including a bias circuit, a reference branch, an output branch, an operational amplifier feedback compensation circuit, and input signals UP / UPB and DN / DNB, which are respectively A pair of complementary switching signals. When UP is high level and UPB is low level, the charging current tube is turned on to charge the subsequent load; when DN is high level and DNB is low level, the discharge current tube is turned on to discharge the subsequent load; When UP and DN are at high level at the same time, the magnitude of the charging current is equal to the discharge current; when UP and DN are at low level at the same time, the charge and discharge current tubes are all turned off, and the output is in a high-impedance state.
[0025] Such as figure 1 As shown, t...
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The invention discloses a complementary feedback-type gate switch charge pump circuit, which comprises a bias circuit, a reference branch, an output branch and an operational amplifier feedback compensation circuit, wherein the bias circuit provides bias voltage for a charging current tube and a discharging current tube in the output branch via two paths of current mirror bias tubes; the reference branch and the output branch enable bias level not to generate large fluctuation along with switch signals via a capacitor and a transmission door structure, and the bias level is enabled to be stable; and the operational amplifier feedback compensation circuit compares the output level and the reference level, the level is fed back to the current mirror bias tubes to compensate an upper and lower charging and discharging current value. Low-voltage design requirements can be met, matching and stabilizing of charging current and discharging current of the charge pump can be ensured, and low-phase noise requirements of a phase-locked loop can be met.
Description
technical field [0001] The invention relates to charge pump circuit technology, in particular to a complementary feedback gate switch charge pump circuit. Background technique [0002] According to the position of the switch tube, the charge pump can be divided into three categories: drain switch, source switch and gate switch. Commonly used charge pump structures are mainly in the form of drain switches. The charge sharing effect is eliminated by the "bootstrapping" method, and the matching degree of the charge and discharge current is improved by the feedback method of the op amp. This kind of drain switch charge pump circuit can obtain better charging and discharging current matching and faster switching speed. However, two switch tubes and two current tubes are stacked between the power supply and the ground, and the minimum power supply voltage is at least the sum of the source-drain voltage of the two switch tubes and the source-drain voltage of the two current tubes...
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IPC IPC(8): H02M3/07
CPCH02M3/07
Inventor 吴建辉陈怀昊丁欣陈超李红
Owner SOUTHEAST UNIV