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    • 21. 发明授权
    • Adaptive bias for low power low dropout voltage regulators
    • 低功耗低压差稳压器的自适应偏置
    • US08922179B2
    • 2014-12-30
    • US13323082
    • 2011-12-12
    • Petr Kadanka
    • Petr Kadanka
    • G05F1/00
    • G05F1/565
    • A low dropout (LDO) voltage regulator includes a voltage regulation loop for providing a gate drive signal to an output device, the gate drive signal proportional to an output current. The voltage regulation loop includes a current bias input for receiving a bias current. The LDO voltage regulator further includes a current bias control circuit for providing the adaptive bias current at a first value that is proportional to current limit value lab and the width-to-length ratio of transistors of the transconductance amplifier when the output current less than or equal to a threshold and increases the bias current from a threshold to a current limit value. The output current varies substantially linearly over a range of output current values between the threshold and the current limit value.
    • 低压差(LDO)电压调节器包括用于向输出装置提供栅极驱动信号的电压调节回路,栅极驱动信号与输出电流成比例。 电压调节回路包括用于接收偏置电流的电流偏置输入。 所述LDO电压调节器还包括电流偏置控制电路,用于在所述输出电流小于或等于所述输出电流时,将所述自适应偏置电流提供为与电流限制值实验室成比例的第一值和所述跨导放大器的晶体管的宽度与长度之比, 等于阈值,并将偏置电流从阈值增加到电流极限值。 输出电流在阈值和电流极限值之间的输出电流值的范围内基本线性地变化。
    • 25. 发明授权
    • Reduced noise band gap reference with current feedback and method of using
    • 降低噪声带隙参考电流反馈和使用方法
    • US06472928B1
    • 2002-10-29
    • US09848198
    • 2001-05-04
    • Petr Kadanka
    • Petr Kadanka
    • G05F110
    • G05F3/30
    • A band gap reference (32) provides low noise operation utilizing capacitor (98) to produce a low pass filter operating with high impedance node (104). Increased speed is realized using feedback signals at nodes (102) and (100) to control differential transistor pair (36, 42). A first current feedback stage using transistors (44, 50, 52 and 54) and a second current feedback stage using transistors (60, 62, 68, 70) is used to control current mirror stages which set the charge and discharge current at node (104). A first current mirror stage using transistors (64,76) comprise the current sink used to discharge capacitor (98) at node (104) and a second current mirror stage using transistors (58,74) comprise the current source used to charge capacitor (98) at node (104).
    • 带隙基准(32)利用电容器(98)提供低噪声操作,以产生用高阻抗节点(104)工作的低通滤波器。 通过节点(102)和(100)处的反馈信号来实现增加的速度以控制差分晶体管对(36,42)。 使用晶体管(44,50,52和54)和使用晶体管(60,62,68,70)的第二电流反馈级的第一电流反馈级用于控制电流镜级,其设置节点处的充电和放电电流( 104)。 使用晶体管(64,76)的第一电流镜级包括用于在节点(104)处放电电容器(98)的电流吸收器和使用晶体管(58,74)的第二电流镜级,包括用于对电容器( 98)。
    • 26. 发明授权
    • Bandgap reference circuit
    • 带隙参考电路
    • US5834926A
    • 1998-11-10
    • US907971
    • 1997-08-11
    • Petr Kadanka
    • Petr Kadanka
    • G05F3/30G05F3/16
    • G05F3/30Y10S323/907
    • In a bandgap reference circuit (200), a base-emitter voltage V.sub.BE with a first temperature coefficient TC.sub.1 is added to a voltage difference .DELTA.V with a second, opposite temperature coefficient TC.sub.2 by two resistors (210,220). The bandgap reference circuit (200) comprises current sources (271-276) and bipolar transistors Q(1) to Q(K) (281-286) of pnp-type and npn-type. Current densities in Q(1) to Q(6) are distributed so that some base-emitter voltages V.sub.BEk in Q(1) to Q(6) are different. The bases and emitters of Q(1) to Q(6) are serially coupled so that pn-junctions are arranged in a alternative directions, thus adding only the differences of V.sub.BEk but not adding their absolute values. This feature makes the circuit (200) applicable in a low voltage environment. The ratio between the two resistors (210,220) can have a value which minimizes noise voltages V.sub.N so that external filtering capacitors are not required.
    • 在带隙参考电路(200)中,具有第一温度系数TC1的基极 - 发射极电压VBE通过两个电阻器(210,220)被加到具有第二相反温度系数TC2的电压差DELTA V上。 带隙参考电路(200)包括pnp型和npn型的电流源(271-276)和双极晶体管Q(1)至Q(K)(281-286)。 分配Q(1)至Q(6)中的电流密度,使得Q(1)至Q(6)中的一些基极 - 发射极电压VBEk不同。 Q(1)至Q(6)的基极和发射极串联耦合,使得pn结排列在替代方向上,从而仅增加VBEk的差异,但不增加其绝对值。 该特征使电路(200)适用于低电压环境。 两个电阻器(210,220)之间的比率可以具有使噪声电压VN最小化的值,使得不需要外部滤波电容器。
    • 27. 发明授权
    • Electrical apparatus and method for providing a reference signal
    • 用于提供参考信号的电气设备和方法
    • US5621308A
    • 1997-04-15
    • US609252
    • 1996-02-29
    • Petr KadankaRobert L. Vyne
    • Petr KadankaRobert L. Vyne
    • G05F3/26G05F3/16G05F3/20
    • G05F3/265
    • A band-gap voltage reference (39) has a regulator portion (70) providing a substantially constant current of predetermined magnitude Ic and a band-gap reference portion (72) receiving Ic. The reference portion (72) has a first branch including a first transistor (52) of a first type serially coupled to a second transistor (55) of a second type, a second branch including a third transistor (53) of the first type serially coupled to a fourth transistor (56) of the second type, the first and second branches forming a current mirror (73) carrying a total current of about Ic/2, and a third branch (57) in parallel with the first and second branches and carrying a current of substantially Ic-Ic/2. Base current (65) in the first two branches is compensated by base current (64) of the third branch.
    • 带隙电压基准(39)具有提供预定大小Ic的基本上恒定的电流的调节器部分(70)和接收Ic的带隙基准部分(72)。 参考部分(72)具有包括第一类型的第一晶体管(52)的第一分支,第一晶体管(52)串联连接到第二类型的第二晶体管(55),第二分支包括第一类型的第三晶体管(53) 耦合到第二类型的第四晶体管(56),第一和第二分支形成承载总电流约Ic / 2的电流镜(73),以及与第一和第二分支平行的第三分支(57) 并承载大致Ic-Ic / 2的电流。 前两个分支中的基极电流(65)由第三分支的基极电流(64)补偿。