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System Simulator > Charge Pump (CPUMP)
Notes1. This element models the behavior of the charge pump device. 2. Let the first input signal be
3. In the above equation, the term 4. In general, for typical PLL applications, the two input impedances should be set to default (INF), and the output impedance should be set to a large value, normally 1e10 is good enough. Netlist FormCPUMP:Name n1 n2 n3 [I_UP=val] [UP_NFLOOR=val] [UP_FC=val] +[UP_NOISE=val][I_DOWN=val] [DOWN_NFLOOR=val] [DOWN_FC=val] +[DOWN_NOISE=val] [STARTTIME=val] [STOPTIME=val] +[I_TRICKLE=val] [TRICKLE_NFLOOR=val] [TRICKLE_FC=val] +[TRICKLE_NOISE=val] [SEED=val] [RIN1=val] [RIN2=val] +[ROUT=val] Netlist ExampleCPUMP:1 1 2 3 IUP=160uA IDOWN=160uA ITRICKLE=40uA FC=1000Hz
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Ansoft Designer / Ansys Designer 在线帮助文档：
, the second input signal be 
, and the output signal
be 
, the output signal
is calculated like this: 
is formed by two parts: one part is the
noise from the trickle current, the other part is the noise either from
the up current or from the down current depending on which one is active
at that time instance. The user has the option to turn off the noise
for the three noise sources, if any of the noise sources is turned off,
no noise will be generated for that source. Note that noise simulation
is expensive, turning off the noise option will speed up the simulation.
