Filters in Linear Integrated Circuits: The Filters in Linear Integrated Circuits can be represented in the time domain and frequency domain as shown in Fig. 2.73 (a) and (b). As the filter is frequency selective network, the output Vo(t) contains only some of the frequency components of Vin (t). It is convenient to analyze the filter by representing […]
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Frequency Response for Low Pass Filter and High Pass Filter: The Fig. 2.71 shows the Frequency Response for Low Pass Filter. A low pass filters has a constant gain from 0 Hz to a high cut-off frequency, fH. Hence, the bandwidth of this filter is also fH. The ideal characteristics is shown in Fig. 2.71
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What is Active Filters and types of active filters: Active Filters is a circuit that is designed to pass a specified band frequencies while attenuating all the signals outside that band. It is a frequency selective circuit. The filter are basically classified as active filter and passive filter. The passive filter networks use only passive elements such as resistors,
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Basic Antilog Amplifier Using Diode: The circuit diagram of basic antilog amplifier using diode is shown in the Fig. 2.70. The positions of diode and resistance are exchanged as compared to log amplifier circuit. The node A is grounded and hence node B is at virtual ground. Hence VB = 0. Now the current flowing
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Logarithmic Amplifier using Diode: The circuit diagram of basic Logarithmic Amplifier using Diode is shown in the Fig. 2.69. The diode D is used in the negative feedback path. The node A is grounded hence node B is at virtual ground. Hence VB = 0. As the op-amp input current is zero, Now If is the
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Op Amp with Diode Circuit: Consider a Op Amp with Diode Circuit as shown in the Fig. 2.68 (a) and the corresponding volt-ampere (V-I) characteristics in the Fig. 2.68 (b). The basic volt-ampere relationship for a diode by using Op amp Circuits is given as, where I = diode current Io = reverse saturation current
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Precision Full Wave Rectifier: The Precision Full Wave Rectifier circuits accept an ac signal at the input, inverts either the negative or the positive half, and delivers both the inverted and noninverted halves at the output, as shown in the Fig. 2.62. The operation of the positive full wave rectifier is expressed as and that
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Precision Rectifiers: Recall from basic circuit principles that a rectifier circuits can be implemented with a diode/diodes (half wave rectifier or full wave rectifier). The major limitations of these Precision Rectifiers circuits is that they cannot rectify voltages below VD(ON) = 0.7 V, the cut-in voltage of the diode. In these circuits Vi has to
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Three Op Amp Instrumentation Amplifier | Block Diagram | Advantages | Applications: The commonly used Instrumentation Amplifier circuit is one using three op amps. This Three Op Amp Instrumentation Amplifier circuit provides high input resistance for accurate measurement of signals from transducers. In this circuit, a noninverting amplifier is added to each of the basic
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Need of Instrumentation Amplifier: As we know Instrumentation Amplifier are used to amplify the low level differential signals very precisely, in presence of the large common mode noise and interference signals. Hence a good Need of Instrumentation Amplifier has to meet the following specifications : Finite, accurate and stable gain : As very low level
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