Active filterII - Resistance Simulation : ) ( ) ( 2 1 2 1 V...

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5.2 Active Filters (CONT…. .) Band-Reject Sections : 1 ) 2 ( 2 ) 1 ( ) ( 2 2 2 2 2 2 1 2 + - + + = = s A RC s C R s C R A V V s H V V In the above equation we observe that ϖ o = ϖ r = 1/RC and the Q of the notch is determined by the gain A V = 1 + R b /R a of the Op- Amp stage. Inspection of the equation also indicates that stability requires A V <2.
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(a) A low-pass-high-pass cascade to form a broad-band band- pass circuit. (b) The frequency-response characteristics of the low-pass and high-pass networks result in the (c) band-pass response of the cascade.
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(a) A parallel-channel band-reject circuit. (b) If ϖ L < ϖ H for the high-pass and low pass characteristics in Fig. 5.2.8b, the band-reject response is obtained.
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A notch response
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A twin-tee network used to obtain a notch. If Y = 0, the notch frequency and pole frequencies are equal. Inclusion of Y 0 converts the circuit to a high-pass or low-pass notch.
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Unformatted text preview: Resistance Simulation : ) ( ) ( 2 1 2 1 V V Cf V V T C T Q I s eq-=-= = The current I eq is the same that exists in R eq in Figure. Thus ) ( 2 1 2 1 V V Cf R V V s eq-=-s eq Cf R 1 = or (a) Switched capacitor and (b) its equivalent resistance. (a) Switched-capacitor integrator and (b) its continuos-time equivalent. (a) The circuit in Fig. 5.2.13a with clocked MOSFETs used as the switched. (b) The nonoverlapping two-phase clock waveforms. (a) An impractical switched-capacitor inverting Op-Amp gain stage and (b) a practical circuit. Switched-capacitor realizations of the circuits. Switched-capacitor realization of the band-pass circuit. References • Microelectronics (second edition) Jacob Millman / Arvin Grabel...
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This note was uploaded on 11/07/2009 for the course ELEC ece212 taught by Professor None during the Spring '09 term at York University.

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Active filterII - Resistance Simulation : ) ( ) ( 2 1 2 1 V...

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