Analog Filters

Apinunt Thanachayanont

Filters

2010Mixed-signal ICs Design, A. Thanachayanont2

Types of filters

2010Mixed-signal ICs Design, A. Thanachayanont3

Lowpass

Highpass

Bandpass

Band-reject

Second-order filters (biquadratic function)

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Second-order LPF

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Second-order HPF

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Second-order BPF

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Second-order BRF

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Second-order all-pass filter (APF)

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Active-RC filters

� C integrator

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Active-RC inverting integrator

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Non-inverting integrator

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1st-order filter

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Single amplifier 2nd-order filter – Sallen-

Key LP biquad filter

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Single amplifier 2nd-order filter – Sallen-

Key LP biquad filter

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Single amplifier 2nd-order filter – Sallen-

Key LP biquad filter

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State-variable 2nd-order filters

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Tow-Thomas (TT) biquad

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Arbitrary transmission zeros by

summing

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MOSFET-C filters

� MOSFET in the Triode region

� MOSFET-C integrators

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MOSFET-C TT biquad filter

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Transconductor-C filters

� Transconductor

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Transconductor basic circuits

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Gm-C lossy integrator

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Fully-differential Gm-C integrator

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Gm-C-opamp integrator

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Gyrators

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Gm-C gyrators

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CMOS transconductors

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Transconductor’s non-idealities

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Effects of non-zero go on gyrator

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Effect of phase shift on gyrator

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Gm-C 1st-order filter

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Gm-C 2nd-order filters

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Gm-C 1st-order filter using Miller

integrators

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Gm-C 1st-order filter using Miller

integrators

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Gm-C 2nd -order filter using Miller

integrators

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Gm-C 2nd -order filter using Miller

integrators

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Ladder filter using Gm-C gyrators

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Ladder filter using Signal-Flow Graph

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Gm-C resonator

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Gm-C oscillator

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