Added submodule with desgns

.gitmodules

diff --git a/.gitmodules b/.gitmodules
index c73b442..5066840 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "caravel-lite"]
 	path = caravel
 	url = https://github.com/efabless/caravel-lite
+[submodule "amsat_txrx_ic"]
+	path = amsat_txrx_ic
+	url = git@github.com:yrrapt/amsat_txrx_ic.git

amsat_txrx_ic

diff --git a/amsat_txrx_ic b/amsat_txrx_ic
new file mode 160000
index 0000000..69f8b23
--- /dev/null
+++ b/amsat_txrx_ic
@@ -0,0 +1 @@
+Subproject commit 69f8b23394cef50a1cdd700124f3a4eb6a016c64