pyNgSpice

Brian Taylor 620c15a981 Initial files for translating Pspice u.. instances and timing models into Xspice equivalents. Standard gates, tristate gates, dff, jkff, dlatch are supported. Compound gates and pullup/down are not done. Makefile and frontend/inpcom.c changes have not been finished. These modifications will be needed to complete integration.		4 years ago
..
README	XSPICE example: delta-sigma converter	14 years ago
count-latch-dac.cir	XSPICE example: delta-sigma converter	14 years ago
counter-test.cir	XSPICE example: delta-sigma converter	14 years ago
delta-sigma-1.cir	add y-axis label	4 years ago
mod1-ct-test.cir	XSPICE example: delta-sigma converter	14 years ago
mod1-ct.cir	XSPICE example: delta-sigma converter	14 years ago

README

A simple delta sigma converter using XSPICE
according to 
Schreier, Temes: Understanding Delta-Sigma Data Converters, 2005
Fig. 2.13, p. 31; Fig. 2.27, p.58


delta-sigma-1.cir
converter complete, tested against sine input

mod1-ct.cir
first order modulator
consists of analog continuous time integrator and
digitally latched comparator

count-latch-dac.cir
contains subcircuits of 
10 bit digital latch
10 bit counter, non-revolving, saturating
simple 10 bit DAC with analog B source

mod1-ct-test.cir
test of modulator with sine input, shows noise shaping 20dB/decade

counter-test.cir
simple test with reset