pyNgSpice

Brian Taylor df28fabc42 Restore the deleted unused params to be backword compatible. Handle the case where the d_process instance has a null in vector, so that N_din is zero. This allows the model to be just a pattern generator. Add include to cmproto.h to avoid a forward ref. to an enum type.		3 years ago
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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