Write notes on clamping, Electrical Engineering

Assignment Help:

Q. Write notes on clamping ?

Clamping network shifts (clamps) a signal to a different d.c level, that is it introduces a d.c. level to an a.c signal. Hence, the clamping network is also known as d.c reference signal to the video signal. The clamping network has the various circuit components like a diode, a capacitor and a resistor. The time constant for the circuit G=RC must be large so that the voltage across the capacitor does not discharge significantly when the diode is not conducting.

In the clamper circuit the diodes are assumed to be ideal. A square waveform with maximum amplitude of V is given as the input to the network. During the positive half cycle, the diode conducts, ie it acts like a short circuit. The capacitor charges to V volts. During this interval, the output which is taken across the short circuit will be V0= 0 V. During the negative half cycle, the diode is open. The output voltage can be found out by applying Kirchoff's Law.

-V-V-V0 = 0

Therefore, V0= -2V

The analysis of the clamper circuit can be done as follows. Determine the portion of the input signal that forward biases the diode. When the diode is in short circuit condition, the capacitor charges up to a level determined by the voltage across the capacitor in its equivalent open circuit state. During the open circuit condition of the diode, it is assumed that the capacitor will hold on to all its charge and therefore voltage. In the clamper networks, the total swing of the output is equal to the total swing of the input signal.


Related Discussions:- Write notes on clamping

What is a darlington pair, Q. What is a darlington pair?               ...

Q. What is a darlington pair?                             The Darlington circuit consists of two cascaded emitter followers with infinite emitter resistance in the first stage.

Define hysteresis, Define Hysteresis Hysteresis is the 'lagging' effect...

Define Hysteresis Hysteresis is the 'lagging' effect of flux density B whenever there are changes in the magnetic field strength H. When an initially unmagnetized ferromagnetic

Design the high-pass filter, Q. Design the high-pass filter shown in Figure...

Q. Design the high-pass filter shown in Figure (by determining C) to have a half-power frequency of 1 MHz.

Find the ratio of the forward to the reverse current, Assume that an abrupt...

Assume that an abrupt Si p-n junction with area 10-4 cm2 has NA=10 17 /cm 3 and ND=10 17 /cm 3 is working at room temperature. It is given that μ n = 700 cm 2 /v-s, μ P =250 cm

What are program invisible registers, What are program invisible registers?...

What are program invisible registers? The global and local descriptor tables are determined in the memory system. So as to access and give the address of these tables, the prog

Data copy operations, Data Copy Operations Instructions which  are used...

Data Copy Operations Instructions which  are used  to copy data from  one location to another  location kept in  this category. The location from  which data  is copied  is cal

What is polyphase induction machine performance, Q. What is Polyphase Induc...

Q. What is Polyphase Induction Machine Performance? Some of the important steady-state performance characteristics of a polyphase induction motor include the variation of curre

Polarisation, describe the working and construction diagram of nicholas pri...

describe the working and construction diagram of nicholas prism

How many machine cycles does 8085 have, How many machine cycles does 8085 h...

How many machine cycles does 8085 have, mention them The 8085 have seven machine cycles. They are Opcode fetch Memory read Memory write I/O read I/O

Basic structure of an scr and the common circuit symbol, Q. Draw the basic ...

Q. Draw the basic structure of an SCR and the common circuit symbol ? The SILICON CONTROLLED RECTIFIER, usually referred to as an SCR, is one of the families of semiconductors

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd