BODE PLOT MULTISIM SERIES

The Bode Plot shows the Frequency Response of the filter to be nearly flat for low frequencies and all of the input signal is passed directly to the output, resulting in a gain of nearly 1, called unity, until it reaches its Cut-off Frequency point ( Р–вЂ™c ). This type of filter is known generally as a РІР‚Сљfirst-order filterРІР‚Сњ or РІР‚Сљone-pole filterРІР‚Сњ, why first-order or single-pole?, because it has only РІР‚СљoneРІР‚Сњ reactive component, the capacitor, in the circuit.

BODE PLOT MULTISIM SERIES

In this type of filter arrangement the input signal (Р’В V INР’В ) is applied to the series combination (both the Resistor and Capacitor together) but the output signal (Р’В V OUTР’В ) is taken across the capacitor only.

The Low Pass FilterР”Р„ simple passive RC Low Pass Filter or LPF, can be easily made by connecting together in series a single Resistor with a single Capacitor as shown below. In this tutorial we will look at the simplest type, a passive two component RC low pass filter. The simplest low pass filters consist of a resistor and capacitor but more sophisticated low pass filters have a combination of series inductors and parallel capacitors. The frequency at which the transition occurs is called the РІР‚Сљcut-offРІР‚Сњ or РІР‚СљcornerРІР‚Сњ frequency. As there are two passive components within a passive filter design the output signal has a smaller amplitude than its corresponding input signal, therefore passive RC filters attenuate the signal and have a gain of less than one, (unity).Р”Р„ Low Pass Filter can be a combination of capacitance, inductance or resistance intended to produce high attenuation above a specified frequency and little or no attenuation below that frequency. Active filters contain amplifying devices to increase signal strength while passive do not contain amplifying devices to strengthen the signal.

Ideal Filter Response CurvesР”Р‡ilters can be divided into two distinct types: active filters and passive filters. Simple First-order passive filters (1st order) can be made by connecting together a single resistor and a single capacitor in series across an input signal, (Р’В V INР’В ) with the output of the filter, (Р’В V OUTР’В ) taken from the junction of these two components.Р”Вepending on which way around we connect the resistor and the capacitor with regards to the output signal determines the type of filter construction resulting in either a Low Pass Filter or a High Pass Filter.Р”Р„s the function of any filter is to allow signals of a given band of frequencies to pass unaltered while attenuating or weakening all others that are not wanted, we can define the amplitude response characteristics of an ideal filter by using an ideal frequency response curve of the four basic filter types as shown.

The Band Pass FilterР’В РІР‚вЂњР’В the band pass filter allows signals falling within a certain frequency band setup between two points to pass through while blocking both the lower and higher frequencies either side of this frequency band.

The High Pass FilterР’В РІР‚вЂњР’В the high pass filter only allows high frequency signals from its cut-off frequency, Р–вЂ™c point and higher to infinity to pass through while blocking those any lower.

The Low Pass FilterР’В РІР‚вЂњР’В the low pass filter only allows low frequency signals from 0Hz to its cut-off frequency, Р–вЂ™c point to pass while blocking those any higher.

The most commonly used filter designs are the: Passive filters are made up of passive components such as resistors, capacitors and inductors and have no amplifying elements (transistors, op-amps, etc) so have no signal gain, therefore their output level is always less than the input.Р”Р‡ilters are so named according to the frequency range of signals that they allow to pass through them, while blocking or РІР‚СљattenuatingРІР‚Сњ the rest. In low frequency applications (up to 100kHz), passive filters are generally constructed using simple RC (Resistor-Capacitor) networks, while higher frequency filters (above 100kHz) are usually made from RLC (Resistor-Inductor-Capacitor) components. In other words they РІР‚Сљfilter-outРІР‚Сњ unwanted signals and an ideal filter will separate and pass sinusoidal input signals based upon their frequency.

Bode plot multisim