Merge pull request #276 from harshkhandeparkar/prepex-glayout

Glayout PrePEX SPICE Generation

openfasoc/generators/gdsfactory-gen/glayout/components/diff_pair.py

@@ -13,7 +13,20 @@
 from glayout.primitives.via_gen import via_stack
 from glayout.primitives.guardring import tapring
 from glayout.pdk.util.snap_to_grid import component_snap_to_grid
+from glayout.spice import Netlist
 
+def diff_pair_netlist(fetL: Component, fetR: Component) -> Netlist:
+	diff_pair_netlist = Netlist(circuit_name='DIFF_PAIR', nodes=['VP', 'VN', 'VDD1', 'VDD2', 'VTAIL', 'B'])
+	diff_pair_netlist.connect_netlist(
+		fetL.info['netlist'],
+		[('D', 'VDD1'), ('G', 'VP'), ('S', 'VTAIL'), ('B', 'B')]
+	)
+	diff_pair_netlist.connect_netlist(
+		fetR.info['netlist'],
+		[('D', 'VDD2'), ('G', 'VN'), ('S', 'VTAIL'), ('B', 'B')]
+	)
+
+	return diff_pair_netlist
 
 @cell
 def diff_pair(
@@ -141,7 +154,12 @@ def diff_pair(
 	diffpair.add_ports(PLUSgate_routeW.get_ports_list(),prefix="PLUSgateroute_W_")
 	diffpair.add_ports(PLUSgate_routeE.get_ports_list(),prefix="PLUSgateroute_E_")
 	diffpair.add_padding(layers=(pdk.get_glayer(well),), default=0)
-	return component_snap_to_grid(rename_ports_by_orientation(diffpair))
+
+	component = component_snap_to_grid(rename_ports_by_orientation(diffpair))
+
+	component.info['netlist'] = diff_pair_netlist(fetL, fetR)
+	return component
+
 
 
 

openfasoc/generators/gdsfactory-gen/glayout/components/diff_pair_cmirrorbias.py

@@ -35,7 +35,42 @@
 from glayout.pdk.util.snap_to_grid import component_snap_to_grid
 from pydantic import validate_arguments
 from glayout.placement.two_transistor_interdigitized import two_nfet_interdigitized
+from glayout.spice import Netlist
+from glayout.components.stacked_current_mirror import current_mirror_netlist
 
+def diff_pair_ibias_netlist(center_diffpair: Component, current_mirror: Component, antenna_diode: Component) -> Netlist:
+    netlist = Netlist(
+        circuit_name="DIFFPAIR_CMIRROR_BIAS",
+        nodes=['VP', 'VN', 'VDD1', 'VDD2', 'IBIAS', 'VSS', 'B']
+    )
+
+    diffpair_ref = netlist.connect_netlist(
+        center_diffpair.info['netlist'],
+        []
+    )
+
+    cmirror_ref = netlist.connect_netlist(
+        current_mirror.info['netlist'],
+        [('VREF', 'IBIAS')]
+    )
+
+    netlist.connect_subnets(
+        cmirror_ref,
+        diffpair_ref,
+        [('VCOPY', 'VTAIL')]
+    )
+
+    netlist.connect_netlist(
+        antenna_diode.info['netlist'],
+        [('D', 'VSS'), ('G', 'VSS'), ('B', 'VSS'), ('S', 'VP')]
+    )
+
+    netlist.connect_netlist(
+        antenna_diode.info['netlist'],
+        [('D', 'VSS'), ('G', 'VSS'), ('B', 'VSS'), ('S', 'VN')]
+    )
+
+    return netlist
 
 @validate_arguments
 def diff_pair_ibias(
@@ -145,6 +180,14 @@ def diff_pair_ibias(
         viaoffset=False,
     )
     cmirror.add_ports(srcshort.get_ports_list(), prefix="purposegndports")
+    # current mirror netlist
+    cmirror.info['netlist'] = current_mirror_netlist(
+        pdk,
+        width=diffpair_bias[0],
+        length=diffpair_bias[1],
+        multipliers=diffpair_bias[2]
+    )
+
     # add cmirror
     tailcurrent_ref = diffpair_i_ << cmirror
     tailcurrent_ref.movey(
@@ -158,6 +201,9 @@ def diff_pair_ibias(
     purposegndPort.name = "ibias_purposegndport"
     diffpair_i_.add_ports([purposegndPort])
     diffpair_i_.add_ports(tailcurrent_ref.get_ports_list(), prefix="ibias_")
+
     diffpair_i_ref = prec_ref_center(diffpair_i_)
+
+    diffpair_i_ref.info['netlist'] = diff_pair_ibias_netlist(center_diffpair_comp, cmirror, antenna_diode_comp)
     return diffpair_i_ref
 

openfasoc/generators/gdsfactory-gen/glayout/components/diff_pair_stackedcmirror.py

@@ -31,6 +31,9 @@ def __add_diff_pair_and_bias(pdk: MappedPDK, toplevel_stacked: Component, half_d
     diffpair_i_ref = diff_pair_ibias(pdk, half_diffpair_params, diffpair_bias, rmult, with_antenna_diode_on_diffinputs)
     toplevel_stacked.add(diffpair_i_ref)
     toplevel_stacked.add_ports(diffpair_i_ref.get_ports_list(),prefix="diffpair_")
+
+    toplevel_stacked.info['netlist'] = diffpair_i_ref.info['netlist']
+
     return toplevel_stacked
 
 @validate_arguments
@@ -103,11 +106,11 @@ def __route_bottom_ncomps_except_drain_nbias(pdk: MappedPDK, toplevel_stacked: C
 
 
 def diff_pair_stackedcmirror(
-    pdk: MappedPDK, 
-    half_diffpair_params: tuple[float, float, int], 
-    diffpair_bias: tuple[float, float, int], 
+    pdk: MappedPDK,
+    half_diffpair_params: tuple[float, float, int],
+    diffpair_bias: tuple[float, float, int],
     half_common_source_nbias: tuple[float, float, int, int],
-    rmult: int, 
+    rmult: int,
     with_antenna_diode_on_diffinputs: int
 ) -> Component:
     # create toplevel_stacked component
@@ -123,4 +126,5 @@ def diff_pair_stackedcmirror(
     # route bottom ncomps except drain of nbias (still need to place common source pmos amp)
     toplevel_stacked, halfmultn_drain_routeref, halfmultn_gate_routeref, _cref = __route_bottom_ncomps_except_drain_nbias(pdk, toplevel_stacked, gndpin, half_common_source_nbias[3])
     toplevel_stacked.add_ports(gndpin.get_ports_list(), prefix="pin_gnd_")
+
     return toplevel_stacked, halfmultn_drain_routeref, halfmultn_gate_routeref, _cref

openfasoc/generators/gdsfactory-gen/glayout/components/differential_to_single_ended_converter.py

@@ -18,6 +18,7 @@
 from glayout.pdk.util.snap_to_grid import component_snap_to_grid
 from pydantic import validate_arguments
 from glayout.placement.two_transistor_interdigitized import two_nfet_interdigitized
+from glayout.spice import Netlist
 
 
 
@@ -83,6 +84,7 @@ def __create_sharedgatecomps(pdk: MappedPDK, rmult: int, half_pload: tuple[float
     ytranslation_pcenter = 2 * pcenterfourunits.ymax + 5*pdk.util_max_metal_seperation()
     ptop_AB = (shared_gate_comps << twomultpcomps).movey(ytranslation_pcenter)
     pbottom_AB = (shared_gate_comps << twomultpcomps).movey(-1 * ytranslation_pcenter)
+
     return shared_gate_comps, ptop_AB, pbottom_AB, LRplusdopedPorts, LRgatePorts, LRdrainsPorts, LRsourcesPorts, LRdummyports
 
 
@@ -144,10 +146,32 @@ def __route_sharedgatecomps(pdk: MappedPDK, shared_gate_comps, via_location, pto
     shared_gate_comps.add_ports(mimcap_connection_ref.get_ports_list(),prefix="mimcap_connection_")
     return shared_gate_comps
 
+def differential_to_single_ended_converter_netlist(pdk: MappedPDK, half_pload: tuple[float, float, int]) -> Netlist:
+    return Netlist(
+        circuit_name="DIFF_TO_SINGLE",
+        nodes=['VIN', 'VOUT', 'VSS', 'VSS2'],
+        source_netlist=""".subckt {circuit_name} {nodes} l=1 w=1 mt=1 mb=1
+XTOP1 V1   VIN VSS  VSS {model} l={{l}} w={{w}} m={{mt}}
+XTOP2 VSS2 VIN VSS  VSS {model} l={{l}} w={{w}} m={{mt}}
+XBOT1 VIN  VIN V1   VSS {model} l={{l}} w={{w}} m={{mb}}
+XBOT2 VOUT VIN VSS2 VSS {model} l={{l}} w={{w}} m={{mb}}
+.ends {circuit_name}""",
+        instance_format="X{name} {nodes} {circuit_name} l={length} w={width} mt={mult_top} mb={mult_bot}",
+        parameters={
+            'model': pdk.models['pfet'],
+            'width': half_pload[0],
+            'length': half_pload[1],
+            'mult_top': 4 * 2,
+            'mult_bot': half_pload[2] * 2
+        }
+    )
 
 def differential_to_single_ended_converter(pdk: MappedPDK, rmult: int, half_pload: tuple[float,float,int], via_xlocation) -> tuple:
     clear_cache()
     pmos_comps, ptop_AB, pbottom_AB, LRplusdopedPorts, LRgatePorts, LRdrainsPorts, LRsourcesPorts, LRdummyports = __create_sharedgatecomps(pdk, rmult,half_pload)
     clear_cache()
     pmos_comps = __route_sharedgatecomps(pdk, pmos_comps, via_xlocation, ptop_AB, pbottom_AB, LRplusdopedPorts, LRgatePorts, LRdrainsPorts, LRsourcesPorts, LRdummyports)
+
+    pmos_comps.info['netlist'] = differential_to_single_ended_converter_netlist(pdk, half_pload)
+
     return pmos_comps

openfasoc/generators/gdsfactory-gen/glayout/components/opamp.py

@@ -18,10 +18,30 @@
 from glayout.pdk.util.snap_to_grid import component_snap_to_grid
 from pydantic import validate_arguments
 from glayout.placement.two_transistor_interdigitized import two_nfet_interdigitized
-
+from glayout.spice import Netlist
 
 from glayout.components.opamp_twostage import opamp_twostage
+from glayout.components.stacked_current_mirror import current_mirror_netlist
+
+def opamp_output_stage_netlist(pdk: MappedPDK, output_amp_fet_ref: ComponentReference, biasParams: list) -> Netlist:
+    bias_netlist = current_mirror_netlist(pdk, biasParams[0], biasParams[1], biasParams[2])
 
+    output_stage_netlist = Netlist(
+        circuit_name="OUTPUT_STAGE",
+        nodes=['VDD', 'GND', 'IBIAS', 'VIN', 'VOUT']
+    )
+
+    output_stage_netlist.connect_netlist(
+        output_amp_fet_ref.info['netlist'],
+        [('D', 'VDD'), ('G', 'VIN'), ('B', 'GND'), ('S', 'VOUT')]
+    )
+
+    output_stage_netlist.connect_netlist(
+        bias_netlist,
+        [('VREF', 'IBIAS'), ('VSS', 'GND'), ('VCOPY', 'VOUT')]
+    )
+
+    return output_stage_netlist
 
 @validate_arguments
 def __add_output_stage(
@@ -30,7 +50,7 @@ def __add_output_stage(
     amplifierParams: tuple[float, float, int],
     biasParams: list,
     rmult: int,
-) -> Component:
+) -> tuple[Component, Netlist]:
     '''add output stage to opamp_top, args:
     pdk = pdk to use
     opamp_top = component to add output stage to
@@ -65,6 +85,7 @@ def __add_output_stage(
         with_substrate_tap=False,
         tie_layers=("met2","met2")
     )
+
     metal_sep = pdk.util_max_metal_seperation()
     # Locate output stage relative position
     # x-coordinate: Center of SW capacitor in array
@@ -107,9 +128,27 @@ def __add_output_stage(
     bias_pin.movex(cmirror_ibias.center[0]).movey(cmirror_ibias.ports["B_gate_S"].center[1]-bias_pin.ymax-5*metal_sep)
     opamp_top << straight_route(pdk, bias_pin.ports["e2"], cmirror_ibias.ports["B_gate_S"],width=1)
     opamp_top.add_ports(bias_pin.get_ports_list(),prefix="pin_outputibias_")
-    return opamp_top
 
+    output_stage_netlist = opamp_output_stage_netlist(pdk, amp_fet_ref, biasParams)
+    return opamp_top, output_stage_netlist
+
+def opamp_netlist(two_stage_netlist: Netlist, output_stage_netlist: Netlist) -> Netlist:
+    top_level_netlist = Netlist(
+        circuit_name="opamp",
+        nodes=['gnd', 'CSoutput', 'output', 'vdd', 'plus', 'minus', 'commonsourceibias', 'outputibias', 'diffpairibias']
+    )
+
+    top_level_netlist.connect_netlist(
+        two_stage_netlist,
+        [('VDD', 'vdd'), ('GND', 'gnd'), ('DIFFPAIR_BIAS', 'diffpairibias'), ('VP', 'plus'), ('VN', 'minus'), ('CS_BIAS', 'commonsourceibias'), ('VOUT', 'CSoutput')]
+    )
+
+    top_level_netlist.connect_netlist(
+        output_stage_netlist,
+        [('VDD', 'vdd'), ('GND', 'gnd'), ('IBIAS', 'outputibias'), ('VIN', 'CSoutput'), ('VOUT', 'output')]
+    )
 
+    return top_level_netlist
 
 @cell
 def opamp(
@@ -155,7 +194,9 @@ def opamp(
         with_antenna_diode_on_diffinputs
     )
     # add output amplfier stage
-    opamp_top = __add_output_stage(pdk, opamp_top, output_stage_params, output_stage_bias, rmult)
+    opamp_top, output_stage_netlist = __add_output_stage(pdk, opamp_top, output_stage_params, output_stage_bias, rmult)
+    opamp_top.info['netlist'] = opamp_netlist(opamp_top.info['netlist'], output_stage_netlist)
+
     # return
     return rename_ports_by_orientation(component_snap_to_grid(opamp_top))
 

openfasoc/generators/gdsfactory-gen/glayout/components/opamp_twostage.py

@@ -24,8 +24,8 @@
 from glayout.components.differential_to_single_ended_converter import differential_to_single_ended_converter
 from glayout.components.row_csamplifier_diff_to_single_ended_converter import row_csamplifier_diff_to_single_ended_converter
 from glayout.components.diff_pair_stackedcmirror import diff_pair_stackedcmirror
-
-
+from glayout.spice import Netlist
+from glayout.components.stacked_current_mirror import current_mirror_netlist
 
 @validate_arguments
 def __create_and_route_pins(
@@ -106,10 +106,13 @@ def __create_and_route_pins(
 
 
 @validate_arguments
-def __add_mimcap_arr(pdk: MappedPDK, opamp_top: Component, mim_cap_size, mim_cap_rows, ymin: float, n_to_p_output_route) -> Component:
+def __add_mimcap_arr(pdk: MappedPDK, opamp_top: Component, mim_cap_size, mim_cap_rows, ymin: float, n_to_p_output_route) -> tuple[Component, Netlist]:
     mim_cap_size = pdk.snap_to_2xgrid(mim_cap_size, return_type="float")
     max_metalsep = pdk.util_max_metal_seperation()
     mimcaps_ref = opamp_top << mimcap_array(pdk,mim_cap_rows,2,size=mim_cap_size,rmult=6)
+
+    mimcap_netlist = mimcaps_ref.info['netlist']
+
     displace_fact = max(max_metalsep,pdk.get_grule("capmet")["min_separation"])
     mimcaps_ref.movex(pdk.snap_to_2xgrid(opamp_top.xmax + displace_fact + mim_cap_size[0]/2))
     mimcaps_ref.movey(pdk.snap_to_2xgrid(ymin + mim_cap_size[1]/2))
@@ -123,9 +126,57 @@ def __add_mimcap_arr(pdk: MappedPDK, opamp_top: Component, mim_cap_size, mim_cap
     opamp_top.add_ports(mimcaps_ref.get_ports_list(),prefix="mimcap_")
     # add the cs output as a port
     opamp_top.add_port(name="commonsource_output_E", port=intermediate_output)
-    return opamp_top
+    return opamp_top, mimcap_netlist
+
+def opamp_gain_stage_netlist(mimcap_netlist: Netlist, diff_cs_netlist: Netlist, cs_bias_netlist: Netlist) -> Netlist:
+    netlist = Netlist(
+        circuit_name="GAIN_STAGE",
+        nodes=['VIN1', 'VIN2', 'VOUT', 'VDD', 'IBIAS', 'GND']
+    )
+
+    diff_cs_ref = netlist.connect_netlist(
+        diff_cs_netlist,
+        [('VSS', 'VDD')]
+    )
+
+    netlist.connect_netlist(
+        cs_bias_netlist,
+        [('VREF', 'IBIAS'), ('VSS', 'GND'), ('VCOPY', 'VOUT')]
+    )
+
+    mimcap_ref = netlist.connect_netlist(mimcap_netlist, [('V2', 'VOUT')])
+
+    netlist.connect_subnets(
+        mimcap_ref,
+        diff_cs_ref,
+        [('V1', 'VSS2')]
+    )
+
+    return netlist
 
+def opamp_twostage_netlist(input_stage_netlist: Netlist, gain_stage_netlist: Netlist) -> Netlist:
+    two_stage_netlist = Netlist(
+        circuit_name="OPAMP_TWO_STAGE",
+        nodes=['VDD', 'GND', 'DIFFPAIR_BIAS', 'VP', 'VN', 'CS_BIAS', 'VOUT']
+    )
 
+    input_stage_ref = two_stage_netlist.connect_netlist(
+        input_stage_netlist,
+        [('IBIAS', 'DIFFPAIR_BIAS'), ('VSS', 'GND'), ('B', 'GND')]
+    )
+
+    gain_stage_ref = two_stage_netlist.connect_netlist(
+        gain_stage_netlist,
+        [('IBIAS', 'CS_BIAS')]
+    )
+
+    two_stage_netlist.connect_subnets(
+        input_stage_ref,
+        gain_stage_ref,
+        [('VDD1', 'VIN1'), ('VDD2', 'VIN2')]
+    )
+
+    return two_stage_netlist
 
 def opamp_twostage(
     pdk: MappedPDK,
@@ -159,10 +210,22 @@ def opamp_twostage(
     if half_common_source_bias[3] < 2:
         raise ValueError("half_common_source_bias num multiplier must be >= 2")
     opamp_top, halfmultn_drain_routeref, halfmultn_gate_routeref, _cref = diff_pair_stackedcmirror(pdk, half_diffpair_params, diffpair_bias, half_common_source_bias, rmult, with_antenna_diode_on_diffinputs)
+
+    opamp_top.info['netlist'].circuit_name = "INPUT_STAGE"
+
     # place pmos components
     pmos_comps = differential_to_single_ended_converter(pdk, rmult, half_pload, opamp_top.ports["diffpair_tl_multiplier_0_drain_N"].center[0])
     clear_cache()
+
     pmos_comps = row_csamplifier_diff_to_single_ended_converter(pdk, pmos_comps, half_common_source_params, rmult)
+
+    cs_bias_netlist = current_mirror_netlist(
+        pdk,
+        width=diffpair_bias[0],
+        length=diffpair_bias[1],
+        multipliers=diffpair_bias[2]
+    )
+
     ydim_ncomps = opamp_top.ymax
     pmos_comps_ref = opamp_top << pmos_comps
     pmos_comps_ref.movey(round(ydim_ncomps + pmos_comps_ref.ymax+10))
@@ -174,10 +237,14 @@ def opamp_twostage(
     opamp_top, n_to_p_output_route = __create_and_route_pins(pdk, opamp_top, pmos_comps_ref, halfmultn_drain_routeref, halfmultn_gate_routeref)
     # place mimcaps and route
     clear_cache()
-    opamp_top = __add_mimcap_arr(pdk, opamp_top, mim_cap_size, mim_cap_rows, pmos_comps_ref.ymin, n_to_p_output_route)
+    opamp_top, mimcap_netlist = __add_mimcap_arr(pdk, opamp_top, mim_cap_size, mim_cap_rows, pmos_comps_ref.ymin, n_to_p_output_route)
     opamp_top.add_ports(n_to_p_output_route.get_ports_list(),"special_con_npr_")
     # return
     opamp_top.add_ports(_cref.get_ports_list(), prefix="gnd_route_")
+
+    pmos_comps.info['netlist'] = opamp_gain_stage_netlist(mimcap_netlist, pmos_comps.info['netlist'], cs_bias_netlist)
+    opamp_top.info['netlist'] = opamp_twostage_netlist(opamp_top.info['netlist'], pmos_comps.info['netlist'])
+
     return opamp_top