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Árpád Bűrmen 683e208d87 BSIM4 version 4.8 is considered to be the latest, i.e. 4.8.3. 7 months 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