ngspice-22-gtkwave/example

ngspice-22-gtkwave/example/run

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+#!/bin/bash
+
+ngspice -b -o xspice_c3.log -r xspice_c3.raw xspice_c3.cir
+
+mv waveforms.lxt xspice_c3.lxt
+
+gtkwave xspice_c3.lxt
+
+# In gtkwave:
+# Select the analog signals and right click "Data Format-->Analog-->Step"
+# and add analog hight extensions to increase their scale.

ngspice-22-gtkwave/example/xspice_c3.cir

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+Mixed IO types
+* This circuit contains a mixture of IO types, including
+* analog, digital, user-defined (real), and 'null'.
+*
+* The circuit demonstrates the use of the digital and
+* user-defined node capability to model system-level designs
+* such as sampled-data filters. The simulated circuit
+* contains a digital oscillator enabled after 100us. The
+* square wave oscillator output is divided by 8 with a
+* ripple counter. The result is passed through a digital
+* filter to convert it to a sine wave.
+*
+.tran 1e-5 1e-3
+.save all
+*
+v1 1 0 0.0 pulse(0 1 1e-4 1e-6)
+r1 1 0 1k
+*
+abridge1 [1] [enable] atod
+.model atod adc_bridge
+*
+aclk [enable clk] clk nand
+.model nand d_nand (rise_delay=1e-5 fall_delay=1e-5)
+*
+adiv2 div2_out clk NULL NULL NULL div2_out dff
+adiv4 div4_out div2_out NULL NULL NULL div4_out dff
+adiv8 div8_out div4_out NULL NULL NULL div8_out dff
+.model dff d_dff
+*
+abridge2 div8_out enable filt_in node_bridge2
+.model node_bridge2 d_to_real (zero=-1 one=1)
+*
+xfilter filt_in clk filt_out dig_filter
+*
+abridge3 filt_out a_out node_bridge3
+.model node_bridge3 real_to_v
+*
+rlpf1 a_out oa_minus 10k
+*
+xlpf 0 oa_minus lpf_out opamp
+*
+rlpf2 oa_minus lpf_out 10k
+clpf lpf_out oa_minus 0.01uF
+*
+*
+.subckt dig_filter filt_in clk filt_out
+*
+.model n0 real_gain (gain=1.0)
+.model n1 real_gain (gain=2.0)
+.model n2 real_gain (gain=1.0)
+.model g1 real_gain (gain=0.125)
+.model zm1 real_delay
+.model d0a real_gain (gain=-0.75)
+.model d1a real_gain (gain=0.5625)
+.model d0b real_gain (gain=-0.3438)
+.model d1b real_gain (gain=1.0)
+*
+an0a filt_in x0a n0
+an1a filt_in x1a n1
+an2a filt_in x2a n2
+*
+az0a x0a clk x1a zm1
+az1a x1a clk x2a zm1
+*
+ad0a x2a x0a d0a
+ad1a x2a x1a d1a
+*
+az2a x2a filt1_out g1
+az3a filt1_out clk filt2_in zm1
+*
+an0b filt2_in x0b n0
+an1b filt2_in x1b n1
+an2b filt2_in x2b n2
+*
+az0b x0b clk x1b zm1
+az1b x1b clk x2b zm1
+*
+ad0 x2b x0b d0b
+ad1 x2b x1b d1b
+*
+az2b x2b clk filt_out zm1
+*
+.ends dig_filter
+*
+*
+.subckt opamp plus minus out
+*
+r1 plus minus 300k
+a1 %vd (plus minus) outint lim
+.model lim limit (out_lower_limit = -12 out_upper_limit = 12
++ fraction = true limit_range = 0.2 gain=300e3)
+r3 outint out 50.0
+r2 out 0 1e12
+*
+.ends opamp
+*
+.end

ngspice-22-gtkwave/example/xspice_c3.log

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+
+Circuit: mixed io types  
+
+Event Driven Nodes:
+-------------------
+enable
+clk
+div2_out
+div4_out
+div8_out
+filt_in
+xfilter.x0a
+xfilter.x1a
+xfilter.x2a
+xfilter.filt1_out
+xfilter.filt2_in
+xfilter.x0b
+xfilter.x1b
+xfilter.x2b
+filt_out
+-------------------
+
+Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
+
+Analog Nodes:
+-------------
+1
+a_out
+oa_minus
+xlpf.outint
+lpf_out
+v1#branch
+a.xlpf.a1#branch_1_0
+abridge3#branch_1_0
+-------------
+
+No. of Data Columns : 9  
+LXT2 time resolution is 1.0e-12 seconds.
+
+
+Initial Transient Solution
+--------------------------
+
+Node                                   Voltage
+----                                   -------
+1                                            0
+a_out                                        0
+oa_minus                                     0
+xlpf.outint                                  0
+lpf_out                                      0
+v1#branch                                    0
+a.xlpf.a1#branch_1_0                         0
+abridge3#branch_1_0                          0
+
+fileEndPoint: flushing binary data to raw file.
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+
+No. of Data Rows : 175
+elapsed time since last call: 0.171 seconds.
+
+Total elapsed time: 0.171 seconds.
+
+Total DRAM available = 2015.417969 MB.
+DRAM currently available = 289.644531 MB.
+Total ngspice program size = 6.072266 MB.
+Resident set size = 1.870117 MB.
+Shared ngspice pages = 647.000 kB.
+Text (code) pages = 1.493164 MB.
+Stack = 0 bytes.
+Library pages = 3.121094 MB.
+