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  IF Wave Traps

Introduction to IF Wave Traps

A resonant circuit tuned to attenuate a specific frequency is termed as wave traps. Generally there are five kinds of trap circuits employed at the input of the video IF amplifiers.

These are as follows

(a) Series tuned,

(b) Parallel tuned

(c) Absorption type,

(d) Degeneration type and

(e) Bird configurations.

a) Series Trap Circuit:

The series trap circuit is a parallel resonant circuit. Series trap circuit offers extremely high impedance at the rejection frequency on which it is tuned. It is connected in series among two IF stages as displayed in diagram. Because the trap is a sharply tuned-circuit intended to reject one frequency or at most, a narrow band of frequencies, it presents negligible impedance to all another frequencies and so the desired signal is passed with no any attenuation.

b) Parallel Trap Circuit -

Parallel trap circuit trap is a series resonant circuit connected in shunt along with the path of the IF signal. The impedance of it is very small at the frequency for which it is tuned. So it works as a short at the frequency which is to be rejected and by passes it to ground. Its connection in the IF stage is demonstrated in diagram. It is essential that the parallel trap circuit has an extremely high Q that is why it rejects only a narrow range of frequencies.

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c) Absorption Trap Circuit -

This displayed in diagram is inductively coupled to the plate or collector load inductance of the IF stage. The trap is tuned to the frequency which is to be discarded. As a result, at this frequency highest current flow in the trap circuit. Because the trap circuit from the tuned load coil draws energy, a sharp reduce in the Q of the tuned load circuit happens with the result that the stage gain at the not desired frequency is very much decreased. This amounts to a large attenuation at the frequency for which the absorption trap is tuned.

d) Degenerative Trap Circuit-

This circuit, demonstrated in diagram applied a large negative feedback to the IF amplifier at the frequency to be discarded. A parallel L-C circuit is inserted in the cathode/emitter lead of the tube/transistor used in the IF stage. The circuit is tuned to the frequency which is to be attenuated. So, at resonance, it builds a large voltage across it that results in a sharp fall in the gain due to the degenerative action. At all another frequency the impedance of the trap circuit is extremely small and therefore practically no degenerative feedback takes place at these frequencies.

e) Bridged Trap Circuit-

The circuit configuration of a bridged 'T filter is displayed in the diagram. The unique characteristic of this circuit is that the value of R is so selected that it efficiently cancels the coil resistance. After that the parallel resonant circuit created through L, C, and C2 acquires a extremely high Q. The value of L, C, and C2 are properly selected to reject the wanted frequency. Due to the large effective Q, this network is extremely selective. It is input in series along with the signal path and the slug in the trap coil is changed for minimum output. Attenuation of the order of 40 db can be simply acquired if essential. The circuit is an additional version of this trap circuit. The bridged T' trap is most extensively used due to its extremely selective attenuation characteristics.

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