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Examples<br />

Transient Noise Analysis Example 2—Switched Capacitor Filter<br />

Transient Noise Analysis Example 2—<br />

Switched Capacitor Filter<br />

Netlist file: transient_noise_filter.cir<br />

This second transient noise analysis example is a 6th order switched capacitor bandpass filter<br />

used in telecommunications applications. Complete simulation results of the circuit and its<br />

noise performance are provided. To increase simulation speed, modeling is implemented at a<br />

macromodel level rather than transistor level. The Eldo macromodels SWITCH and OPA are<br />

used. We first describe the macromodels used and simulation results follow.<br />

Figure 21-47. Switched Capacitor Filter Circuit Schematic<br />

Characterization of the Amplifier<br />

The structure of the amplifier is a classical folded cascade. AC and transient simulations have<br />

been performed at a transistor level to determine the macromodel parameters of the circuit<br />

shown in Figure 21-48:<br />

Eldo® User's Manual, 15.3 1373

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