Circuit forms adjustable bipolar clamp

The easy way to clamp a signal to a given value is to use two zener diodes, connected back-to-back. This method has several disadvantages. The accuracy of the clamping depends on the tolerance of the zener diodes, and the clamping is not adjustable, except by changing diodes. The circuit in Figure 1 is a bipolar clamper with a range of ±1 to ±10V, with the clamping level a function of the input VCLAMP. IC1A, IC1B, and IC3Aare unity-gain buffers. IC2A is a positive clamper, and IC2B is a negative clamper.Figure 2 shows the transfer function, with VCLAMP set at –5V. You can change VCLAMPover the range of –1 to –10V and thereby change the clamping level. If VIN is within –VCLAMP to +VCLAMP, then VOUT=VIN. If VIN exceeds VCLAMP, then VOUT=VCLAMP. To explain how the circuit works, assume four cases, with four values of VIN. Basically, the circuit works in two modes: the linear mode, in which diodes D1 and D2 are open switches, and the clamped mode, in which the diodes are closed switches. Table 1gives results for the four cases. In Case A, the input is 7V, VCLAMP is –5V, D1 conducts, and D2 is an open switch. The feedback loop around IC2A regulates the anode of D1 to 5V and the output of IC2A to 4.4V. In cases B and C, both diodes are open switches. In Case D, D2 conducts, and D1 is an open switch.

时间： 2024-11-06 14:33:04

Circuit forms adjustable bipolar clamp的相关文章

Transistor 晶体管 场效应 双极型 达林顿 CMOS PMOS BJT FET

Transistor Tutorial Summary Transistor Tutorial Summary Bipolar Junction Transistor Tutorial We can summarise this transistors tutorial section as follows: The Bipolar Junction Transistor (BJT) is a three layer device constructed form two semiconduct

（转载）PLC内部电路常见的几种形式

摘要:本文主要分析了数字量输入时PLC内部电路常见的几种形式,并结合传感器常见的NPN和PNP输出,给出了和不同的PLC电路形式连接时的接线方法. Summary: This article has mainly analyzed several internal circuit forms of PLC digital input module, and unified common NPN and PNP outputs of sensors, has given wiring method

Inverted bipolar transistor doubles as a signal clamp

A number of circuits, such as level detectors and AM demodulators, benefit from a rectifier with a low offset voltage. Silicon diodes have an offset of approximately 0.6V and do not work well in low-level circuitry. A Schottky diode is a bit better w

RFID Exploration and Spoofer a bipolar transistor, a pair of FETs, and a rectifying full-bridge followed by a loading FET

RFID Exploration Louis Yi, Mary Ruthven, Kevin O'Toole, & Jay Patterson What did you do? We made an Radio Frequency ID (RFID) card reader and, while attempting to create a long-range spoofer, created an jammer which overcomes card's signals. The read

AN2820 Driving bipolar stepper motors using a medium-density STM32F103xx microcontroller

AN2820 Driving bipolar stepper motors using a medium-density STM32F103xx microcontroller Introduction This application note describes how to achieve compact size, high speed and low cost with less resources when driving bipolar stepper motors using t

Circuit translates I2C voltages

This Design Idea explores level-shifting an I2C bus from 5V/ground (positive domain) to ground/–5V (negative domain). In multisupply systems, you sometimes face a situation in which digital information stored in logic circuits running from 5V to grou

Bipolar transistor boosts switcher's current by 12 times

The circuit in Figure 1 uses a minimal number of external parts to raise the maximum output current of a 0.5A buck switching-regulator IC to more than 6A. The circuit accommodates input voltages of 15 to 60V and delivers output voltages of 3.3, 5, or

Switching regulator forms constant-current source

Many applications require current sources rather than voltage sources. When you need a high-current source, using a linear regulator is inadvisable, because of the high power dissipation in the series resistor. To solve the wasted-power problem, you

Catch Application Exceptions in a Windows Forms Application

You need to handle the System.Windows.Forms.Application.ThreadException event for Windows Forms. This article really helped me: http://bytes.com/forum/thread236199.html. Application.ThreadException += new ThreadExceptionEventHandler(MyCommonException