Simulation/modeling

• You can generate a voltage source with an arbitrary waveform using the voltage source vpwlf in the library analogLib. You need to specify a file that has the voltage values at certain time points. /u2/nagi/courses/E4215/project/tx_output.dat and /u2/nagi/courses/E4215/project/channel_output.dat have the transmitter and the channel outputs respectively.
• Model the clock feedthrough using a 100mV sinusoid at $f_s=1\,\mbox{GHz}$ in series with the input voltage source.
• Use the subcircuits in Fig. 2 to model $g_m$s and opamps. You can make these into subcircuits(parameterized if necessary) and use them. The 1G$\Omega$ resistors are there to provide dc paths to ground and suppress warnings from the simulator about floating nodes. They will not affect the operation of the circuitif you have calculated the component values in your circuit correctly). The resistor in series with the negative input of the cells is for modeling the noise of the opamps/$g_m$s. They too will not affect the operation of your circuit as the current flowing through them is negligible.

Figure 2: (a) Single ended $g_m$, (b) Differential $g_m$, (c) Single ended opamp, (d) Differential opamp.