模拟电路设计手册第二卷： Immersion in the Black Art of Analog Design

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凌力尔特模拟电路设计手册（英文版）- 应用及解决方案指南丛书该手册是凌力尔特模拟电路设计手册的第二卷，标题为“Immersion in the Black Art of Analog Design”，于2013年出版。该手册是Analog Circuit Design的第二卷，编辑者是Bob Dobkin和Jim Williams。该手册旨在为读者提供模拟电路设计的实践指南和解决方案。模拟电路设计是电子工程领域中的一个重要分支，它涉及到模拟电路的设计、分析和实现。模拟电路设计需要考虑到许多因素，如电路的拓扑结构、元件的选择、信号的处理等。该手册涵盖了模拟电路设计的各个方面，包括电路分析、信号处理、滤波器设计、放大器设计、oscillator设计等。在该手册中，作者们分享了他们的实践经验和设计技巧，旨在帮助读者更好地理解模拟电路设计的原理和方法。该手册还提供了一些实际的设计例子，旨在帮助读者更好地掌握模拟电路设计的技术。该手册的主要内容包括： 1. 模拟电路设计的基础知识，包括电路分析、信号处理、滤波器设计等。 2. 模拟电路设计的实践经验和技巧，包括设计方法、设计工具和设计技巧。 3. 模拟电路设计的实际应用，包括音频处理、图像处理、控制系统等。该手册是模拟电路设计领域中的一个重要参考书籍，旨在帮助读者更好地理解和掌握模拟电路设计的技术和方法。知识点： 1. 模拟电路设计的定义和分类 2. 模拟电路设计的基础知识，包括电路分析、信号处理、滤波器设计等 3. 模拟电路设计的实践经验和技巧，包括设计方法、设计工具和设计技巧 4. 模拟电路设计的实际应用，包括音频处理、图像处理、控制系统等 5. 模拟电路设计中常用的元件和器件，包括电阻、电感、电容、晶体管等 6. 模拟电路设计中的信号处理技术，包括filtering、amplification、modulation等 7. 模拟电路设计中的电路分析技术，包括 Kirchhoff's laws、Thevenin's theorem等 8. 模拟电路设计中的设计方法，包括系统设计、模块设计、 Printed Circuit Board (PCB)设计等该手册提供了模拟电路设计领域中的广泛知识和技术，旨在帮助读者更好地理解和掌握模拟电路设计的技术和方法。

Performance enhancement techniques for three-terminal regulators

CHAPTER 1

Power dissipation control is another area where regula-

tors can be helped by additional circuitry. Increasing heat

sink area can be used to offset dissipation problems, but

is a wasteful and inefﬁcient approach. Instead, the regu-

lator can be placed within a switched-mode loop that

servo-controls the voltage across the regulator. In this

arrangement the regulator functions normally while the

switched-mode control loop maintains the voltage across

it at a minimal value, regardless of line or load changes.

Although this approach is not quite as efﬁcient as a clas-

sical switching regulator, it offers lower noise and the

fast transient response of the linear regulator. Figure 1.5

details a DC driven version of the circuit. The LT350A

functions in the conventional fashion, supplying a regu-

lated output at 3A capacity. The remaining components

form the switched-mode dissipation limiting control. This

loop forces the potential across the LT350A to equal the

3.7V value of V

. When the input of the regulator (Trace

A, Figure 1.6) decays far enough, the LT1018 output

(Trace B) switches low, turning on Q1 (Q1 collector is

Trace D). This allows current ﬂow (Trace C) from the cir-

cuit input into the 4500µF capacitor, raising the regulator’s

Figure 1.5฀•฀Switching฀Preregulator

Figure 1.6฀•฀Switching Waveforms

Performance enhancement techniques for three-terminal regulators

CHAPTER 1

conducts, forcing Q1’s base to 30V. This causes Q1’s emit-

ter to clamp 2 V

s below V

, well within the V

–V

OUT

rating of the regulator. Under these conditions, Q1, a high

voltage device, sustains 90V V

at whatever current the

transformer and the regulator’s current limit will support.

The transformer speciﬁed saturates at 130mA, keeping Q1

well within its safe area as it dissipates 12W. If Q1 and the

LT317A are thermally coupled, the regulator will soon go

into thermal shutdown and oscillation will commence. This

action will continue, protecting the load and the regulator

as long as the output remains shorted. The 500pF capaci-

tor and the 10Ω-0.02µF damper aid transient response and

the diodes provide safe discharge paths for the capacitors.

This approach to high voltage regulation is primarily

limited by the power dissipation capability of the device in

series with the regulator. Figure 1.11A uses a vacuum tube

(remember them?) to achieve very high short-circuit dis-

sipation capability. The tube allows high voltage operation

and is extremely tolerant of overloads. This circuit allows

the LT317A to control 600W at 2000V (V1’s plate limit is

300mA) with full short-circuit protection.

Power is not the only area in which regulator perfor-

mance can be augmented. Figure 1.12 shows a way to

increase the stability of a regulator’s output over time and

temperature. This is particularly useful in powering strain

gauge-based transducers. In this circuit the output voltage

is divided down and compared to the 2.5V reference by

A1, a precision ampliﬁer. A1’s output is used to force the

LT317A’s adjustment pin to whatever voltage is required to

maintain the 10V output. A1 contributes negligible error.

The resistors speciﬁed will track within 5ppm/°C and the

reference contributes about 20ppm/°C. The regulator’s

internal circuitry protects against short circuits and ther-

mal overload.

Figure 1.13’s circuit allows a regulator to remotely sense

the feedback voltage, eliminating the effects of voltage

drop in the supply lines. This is a concern where high cur-

rents must be transmitted over relatively long supply rails

or PC traces. Figure 1.13’s circuit uses A1 to sense the

voltage at the point of load. A1’s output, summed with

the regulator’s output, modiﬁes the adjustment pin volt-

age to compensate for the voltage lost across R

DROP

. The

feedback divider is returned through a separate lead from

the load, completing the remote sensing scheme. The 5µF

capacitor ﬁlters noise and the 1k value limits bypass capac-

itor discharge when power is turned off.

A ﬁnal circuit allows voltage regulator-powered circuity

to run from 110VAC or 220VAC without having to switch

transformer windings. Regulator dissipation does not

increase for 220VAC inputs. In Figure 1.14, when T1 is

Figure 1.11A฀•฀Very High Voltage Regulator

Figure 1.12฀•฀Using a Regulator as a Protected Power Stage

for a Reference

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