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Holger Vogt 4ac7a641ec diode model for bulk diode added code taken from dio.c etc. capacitance calculation for vdmos bulk cap removed, is now completely with the diode. An internal node added for series diode resistance RB 8 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 example for .options interp (reduces memory, speeds up plotting) 12 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