ngspice

History

h_vogt c0b5a78097 new XSPICE example: use trtol=1 less ripple, but longer simulation time		2012-07-30 00:01:56 +02:00
..
README	new XSPICE example: mixed mode pll circuit	2012-07-29 13:52:23 +02:00
f-p-det-d-sub.cir	new XSPICE example: mixed mode pll circuit	2012-07-29 13:52:23 +02:00
loop-filter.cir	new XSPICE example: mixed mode pll circuit	2012-07-29 13:52:23 +02:00
pll-xspice.cir	new XSPICE example: use trtol=1	2012-07-30 00:01:56 +02:00
test-f-p-det.cir	new XSPICE example: mixed mode pll circuit	2012-07-29 13:52:23 +02:00
test_vco.cir	new XSPICE example: mixed mode pll circuit	2012-07-29 13:52:23 +02:00
vco_sub.cir	new XSPICE example: mixed mode pll circuit	2012-07-29 13:52:23 +02:00

README

This directory contains a mixed mode pll, combining
ngspice and XSPICE circuit blocks.
The pll consists of the following blocks:
voltage controlled oscillator: vco_sub.cir
digital divider and frequency reference: pll-xspice.cir
phase frequency detector: f-p-det-d-sub.cir
loop filter: loop-filter.cir
main simulation control: pll-xspice.cir

Two test files are included:
test-vco.cir simulates vco frequency versus control voltage
test-f-p-det.cir simulates the phase frequency detector and the loop filter.

The main building blocks are organised as subcircuits.