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Examples<br />

Transient Noise Analysis Example 1—High-Rate Particle Detector<br />

Figure 21-46. Noise at Analog Memory O/P<br />

The effect of the analog memories on the noise behavior acts as a Correlated Double Sampling,<br />

meaning that output noise is reset at each period of the clock.<br />

For this type of circuit, the noise performance is expressed in terms of Equivalent Noise Charge<br />

referred on the input (ENC):<br />

where Noise is the RMS noise value at the output (extracted from the figure above), Signal is<br />

the signal at the output and Qin is the charge injected across the input capacitor (in e − ). In this<br />

case, the ENC is about 2000e − across Cin (Noise = 0.9mV, Signal=7mV, Qin=2.5 fC). This<br />

circuit has been manufactured and experimental measurements match the simulation results<br />

very closely.<br />

Related Topics<br />

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

1372<br />

Eldo® User's Manual, 15.3

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