Types

The clamp circuits are categorized by the operation of them; negative or positive and biased and unbiased. A positive clamp circuit outputs a positive waveform from an input signal; it offsets the input signal so that all the waveform is greater than 0V. A negative clamp is the opposite of this - this clamp outputs a negative waveform from an input signal.

A bias voltage between the diode and ground offsets the output voltage by that amount.

For instance, an input signal of peak value 5V (V_IN = 5V) is applied to positive clamp with a bias of 3V (V_BIAS = 3V), the peak output voltage will be

V_OUT = 2V_IN + V_BIAS

V_OUT = 2 * 5 + 3

VOUT = 13V

Positive unbiased

A positive unbiased clamp

In the negative cycle of input AC signal, the diode is forward biased and conducts, charging the capacitor to the peak positive value of V_IN. During the positive cycle, diode is reverse biased and therefore, does not conduct. The output voltage is thus equal to the voltage stored in    capacitor   plus    the           input  voltage     again,   so            V_OUT                  =            2V_IN

Negative unbiased

A negative unbiased clamp

The negative unbiased clamp is opposite of the equivalent positive clamp. In positive cycle of the input AC signal, diode is forward biased and conducts, charging the capacitor to peak value of VIN. During the negative cycle, the diode is reverse biased and therefore does not conduct. The output voltage is hence equal to the voltage stored in capacitor plus t he input voltage              again,                    

so V_OUT=-2V_IN

Positive biased

A positive biased clamp

A positive biased voltage clamp is similar to an equivalent unbiased clamp but with output voltage offset by the bias amount V_BIAS.      
Therefore,             
V_OUT          =            2V_IN +        V_BIAS

Negative biased

A negative biased clamp

A negative biased voltage clamp is likewise identical to an equivalent unbiased clamp but with the output voltage offset in the negative direction by the bias amount V_BIAS.
Therefore,
 V_OUT = -2V_IN -V_BIAS

Op-amp circuit

Precision op-amp clamp circuit

The figure drawn above shows an op-amp clamp circuit with the non-zero reference clamping voltage. The benefit here is that the clamping level is at precisely the reference voltage. There is no need to take into account the forward voltage drop of diode (which is essential in preceding simple circuits because this adds to the reference voltage). The effect of diode voltage drop on the circuit output will be divided down by gain of the amplifier, resulting in the insignificant error.

Email based Electronics Devices and circuits assignment help - homework help at Expertsmind

Are you searching Electronics Engineering assignment help expert for help with Types of Clamper (electronics) questions?  Types of Clamper (electronics) topic is not easier to learn without any external help?  We at www.expertsmind.com offers free lecture notes for Electronics Devices and circuits assignment help and Electronics Devices and circuits homework help. Live tutors are available 24x7 hours for helping students in their Types of Clamper (electronics) related problems. We provide step by step Types of Clamper (electronics) question's answers with 100% plagiarism free content. We prepare quality content and notes for Types of Clamper (electronics) topic under Electronics Devices and circuits theory and study material. These are avail for subscribed users and they can get advantages anytime.

Why Expertsmind for assignment help

1. Higher degree holder and experienced experts network
2. Punctuality and responsibility of work
3. Quality solution with 100% plagiarism free answers
4. Time on Delivery
5. Privacy of information and details
6. Excellence in solving electronics engineering questions in excels and word format.
7. Best tutoring assistance 24x7 hours