线性控制电荷泵

在传统的电荷泵设计申，往往采用“突发”工作模式以获得最小的静态电流，提高芯片效率。但是，这种一开一关的突发将导致很大的输入电流噪声和输出电压纹波．文章提出了一种“线性”控制模式的电荷泵设计，可将此输入输出噪声降至最小。     

用于相变存储器的高效开关电容电荷泵

提出一种应用于相变存储器芯片的新型开关电容电荷泵。对于16 位的相变存储器芯片,系统擦写时间大于100 ns,电荷泵的驱动能力至少为60 mA。相比于传统开关电容电荷泵,该电荷泵根据负载电流大小自动生成一个使能信号,该信号通过控制升压模块功率管的开启与关断来调节输出电压,最终将输出电压控制在一个允许的范围内波动。采用40 nm CMOS工艺对电荷泵进行设计和仿真,结果表明在5 mA负载时,电源效率为87%,输出纹波为2.84 mV;负载电流从0 mA变化到60 mA时,电源效率皆高于82%;负载电流变化在300 mA/μs时,输出瞬态响应时间为1.63 μs,满足相变存储器芯片的使用要求。     

一种用于AMOLED显示驱动芯片的电荷泵设计

基于开关电容系统理论,设计了一种多通路输出的电荷泵,为AMOLED显示驱动芯片中的源驱动和栅驱动电路提供电源电压.使用混合调制模式,根据源驱动和栅驱动的等效负载情况,分别设计相应的环路调制电路,在实现恒压输出的同时,降低VDH纹波电压与电源噪声,提高功率效率.基于0.18μm HVCMOS工艺的仿真结果表明,电路能够获...     

一种新的四模式电荷泵电路的设计与实现

提出了一种可应用于白光LED驱动芯片的1x/1.25x/1.5x/2x四模式电荷泵电路,采用三相开关时钟信号,从而获得四种电压转换模式。使用CSMC0.5μm工艺流片,分别对基于典型三模式和上述四模式电荷泵设计的白光LED驱动芯片进行比较,结果表明,基于所设计四模式电荷泵的白光LED驱动芯片,在输入电压2.8～3.4V范围内,以1.25x转换模式取代典型的1.5x转换模式,可使驱动芯片效率提高13%。     

用于TFT-LCD液晶显示的可调电荷泵设计

为了满足TFT-LCD液晶显示的驱动要求,设计了一种通过控制饱和区MOS管的导通电阻来调节输出电压的可调电荷泵。与传统的电荷泵相比,该电荷泵通过负反馈系统进行控制,具有输出可调、最少外围器件、低纹波、易于集成等优点。采用此可调电荷泵电路的芯片已在UMC0.6μm-BCD工艺线投片,测试结果表明,该可调电荷泵电路工作良好,独特的稳压方式使得电荷泵输出纹波降至最低,并且电荷泵的电容尺寸小,从而减小了整个系统的PCB面积,可调电荷泵正电压输出范围为10～30V,负电压输出范围为-5～-30V,负载电流为50mA时,输出纹波为27mV,可调电荷泵的整体效率可达80%。     

一种高增益低纹波的电荷泵电路

针对现有电荷泵存在的体效应、电荷回流等问题,提出一种高增益低纹波的电荷泵电路。该电荷泵采用两路互补的结构,减小了输出电压纹波;使用电位选择电路消除体效应,并使用两相低电平不交叠时钟避免电荷回流,提高了电压增益和转换效率。Hspice仿真结果表明,在级数同为5级和电流负载相同的情况下,文中提出的电荷泵相比现有电荷泵具有更高的输出电压和更小的电压纹波。     

采用动态环路调整的多模式低纹波低纹波电荷泵的设计

In order to improve efficiency and reduce the output ripple, a novel multi-mode charge pump is presented. The proposed charge pump includes dual-loop regulation topology-skip and linear modes. It consumes low quiescent current in skip mode for light loads, and produces low ripple in linear mode for heavy loads, which closes the gap between linear mode and skip mode with active regulation; a multi-mode charge pump employing the technique has been implemented in the UMC 0.6-μm-BCD process. The results indicate that the charge pump works well and effectively; it has low ripple with special regulation, and minimizes the size of the capacitance, then decreases the area of the PCB board. The adjustable output of the positive charge pump is 10-30 V, and the maximum output ripple is 100 mV when the load current is 200 mA. The line regulation is 0.2%/V, and load regulation is 0.075%.     

锁相环频率综合器中高性能电荷泵设计

本文基于0.18μm CMOS工艺设计并实现了一种新的高性能电荷泵电路。采用宽输入范围的轨到轨运算放大器和自偏置共源共栅电流镜技术提高了电荷泵在宽输出电压范围内的电流匹配精度;同时,提出通过增加预充电电流源技术来提高电荷泵的初始充电电流,以缩短CPPLLs的建立时间。测试结果表明电荷泵在0.4～1.7V输出电压范围内失配电流小于0.4%,充电电流为100μA,预充电电流为70μA。在1.8V电源电压下,电荷泵电路锁定时的平均功耗为0.9mW。     

电荷泵

便携式移动设备大多以电池供电,其负载电路通常是微处理器控制的设备,比如移动电话、掌上电脑等等,此类设备要求供电电源效率高、输出纹波电压小。直流     

基于电荷泵的倍增/反向双输出电压转换设计与实现

为了解决目前基于电荷泵的开关电容电压转换芯片功能较为单一的问题,基于Dickson经典电荷泵结构,匹配四路双极型晶体管开关同时实现对输入电压的倍增输出以及倍增后的电压反向。四路二极管充作开关来使用,在降低开关器件导通电压的同时简化了开关电路,缩小了电路的尺寸,并降低了电路的功耗。基于国内某工艺线的40 V互补双极型工艺,设计并制作了带正/负两路输出的开关电容电荷泵电压转换器芯片电路。流片测试结果表明：当电源电压为4 V（负载电流为0 mA、+10 mA）、5 V（负载电流为±10 mA）、9 V（负载电流为+10 mA）、10 V（负载电流为-10 mA）以及11 V（空载）时,输出电压均满足设计指标。     

Research and design of a novel current mode charge pump

To meet the demands for a number of LEDs, a novel charge pump circuit with current mode control is proposed. Regulation is achieved by operating the current mirrors and the output current of the operational transcon ductance amplifier. In the steady state, the input current from power voltage retains constant, so reducing the noise induced on the input voltage source and improving the output voltage ripple. The charge pump small-signal model is used to describe the device's dynamic behavior and stability. Analytical predictions were verified by Hspice sim ulation and testing. Load driving is up to 800 mA with a power voltage of 3.6 V, and the output voltage ripple is less than 45 mV. The output response time is less than 8 μs, and the load current jumps from 400 to 800 mA.     

一种用于G类音频功放的带自适应输出的双模电荷泵

本文设计了一种给G类音频功率放大器提供自适应电源的双模电荷泵电路。根据输入信号的幅度,该电荷泵可以提供两档电压轨来节省功耗。它在重载下工作于电流控制模式,轻载下工作于脉冲频率调制(PFM)模式来降低功耗。在PFM工作模式下,引入功率管尺寸动态调整的技术来减小PFM模式下的输出电压纹波并防止开关频率进入音频范围。该电荷泵电路采用0.18μm,3.3V的CMOS工艺制备。试验结果表明该电荷泵在1/2x模式下可以实现79.5％的最高效率,在1x模式下可以实现83.6％的最高效率。在PFM控制模式下,电荷泵在负载电流小于120mA的范围内,其输出纹波小于15mV;在电流控制模式下,在负载电流小于300mA的范围内,其纹波小于18mV。测试结果与文中提出的功率分段的PFM控制模式的纹波、效率的解析模型得到的计算及仿真结果基本一致,验证了模型与分析方法的正确性。     

A dual mode charge pump with adaptive output used in a class G audio power amplifier

A dual mode charge pump to produce an adaptive power supply for a class G audio power amplifier is presented.According to the amplitude of the input signals,the charge pump has two level output voltage rails available to save power.It operates both in current mode at high output load and in pulse frequency modulation (PFM) at light load to reduce the power dissipation.Also,dynamic adjustment of the power stage transistor size based on load current at the PFM mode is introduced to reduce the output voltage ripple and prevent the switching frequency from audio range.The prototype is implemented in 0.18μm 3.3 V CMOS technology.Experimental results show that the maximum power efficiency of the charge pump is 79.5%@ 0.5x mode and 83.6%@ lx mode.The output voltage ripple is less than 15 mV while providing 120 mA of the load current at PFM control and less than 18 mV while providing 300 mA of the load current at current mode control.An analytical model for ripple voltage and efficiency calculation of the proposed PFM control demonstrates reasonable agreement with measured results.     

一种低抖动电荷泵锁相环的设计

采用动态鉴频鉴相器、基于常数跨导轨到轨运算放大器的电荷泵、差分型环形压控振荡器,设计了一种低抖动的电荷泵锁相环。基于SMIC 0.18-μm CMOS工艺,利用Cadence软件完成了电路的设计与仿真。结果表明,动态的鉴频鉴相器,有效消除了死区。新型的电荷泵结构,在输出电压为0.5 V~1.5 V时将电流失配减小到了2%以下。压控振荡器在频率为1 MHz时输出的相位噪声为-94.87 dB在1 MHz,调谐范围为0.8 GHz~1.8 GHz。锁相环锁定后输出电压波动为2.45 mV,输出时钟的峰峰值抖动为12.5 ps。     

低电源电压条件下的双阈值电压泵

由于存在逆向电流,利用电流传输开关特性的改进型的电压泵（NCP-1）的电压增益被大大减弱.本论文提供了一个新的方法.通过使用双阈值电压CMOS代替单阈值电压CMOS,不但消除了逆向电流,而且对低电压有很好的放大增益.PSPICE模拟结果,当电源电压为0.5V时,6级电压泵可使输出电压放大到2.68V.     

Design of a high performance CMOS charge pump for phase-locked loop synthesizers

A new high performance charge pump circuit is designed and realized in 0.18μm CMOS process. A wide input ranged rail-to-rail operational amplifier and self-biasing cascode current mirror are used to enable the charge pump current to be well matched in a wide output voltage range.Furthermore,a method of adding a precharging current source is proposed to increase the initial charge current,which will speed up the settling time of CPPLLs.Test results show that the current mismatching can be less than 0.4%in the output voltage range of 0.4 to 1.7 V,with a charge pump current of 100μA and a precharging current of 70μA.The average power consumption of the charge pump in the locked condition is around 0.9 mW under a 1.8 V supply voltage.     

A multi-mode low ripple charge pump with active regulation

In order to improve efficiency and reduce the output ripple, a novel multi-mode charge pump is presented.The proposed charge pump includes dual-loop regulation topology-skip and linear modes. It consumes low quiescent current in skip mode for light loads, and produces low ripple in linear mode for heavy loads, which closes the gap between linear mode and skip mode with active regulation; a multi-mode charge pump employing the technique has been implemented in the UMC 0.6-μm-BCD process. The results indicate that the charge pump works well and effectively; it has low ripple with special regulation, and minimizes the size of the capacitance, then decreases the area of the PCB board. The adjustable output of the positive charge pump is 10-30 V, and the maximum output ripple is 100 mV when the load current is 200 mA. The line regulation is 0.2%/V, and load regulation is 0.075%.     

用于相变存储器的超低输出纹波2X/1.5X电荷泵

本文针对相变存储器编程驱动电路,提出了一种超低输出电压纹波的开关电容型电荷泵。该电荷泵可根据输入电压的不同,自适应工作在2X/1.5X升压模式之间,以获得更高的电源转换效率。相比于传统开关电容型电荷泵,在充电阶段泵电容被充电至预先设定的电压值Vo-VDD(Vo为预期的输出电压);放电阶段,泵电容串联在输入电压VDD与输出端,通过此方法将电荷泵输出端电压稳定在Vo,并有效的降低了由于电荷分享所造成的输出纹波。在中芯国际40nm标准CMOS工艺模型下,对电路进行了仿真验证,结果表明在输入电压为1.6-2.1V,输出2.5V电压,最大负载电流为10mA,输出电压纹波低于4mV,电源效率最高可达91%。