diff --git a/adijif/clocks/ad9528.py b/adijif/clocks/ad9528.py
index 1da6b80..304d203 100644
--- a/adijif/clocks/ad9528.py
+++ b/adijif/clocks/ad9528.py
@@ -223,7 +223,12 @@ def b(self, value: Union[int, List[int]]) -> None:
         self._b = value
 
     @property
-    def vco(self):
+    def vco(self) -> float:
+        """VCO Frequency in Hz.
+
+        Returns:
+            float: computed VCO frequency
+        """
         r1 = self._get_val(self.config["r1"])
         m1 = self._get_val(self.config["m1"])
         n2 = self._get_val(self.config["n2"])
@@ -231,11 +236,11 @@ def vco(self):
         return self.vcxo / r1 * m1 * n2
 
     @property
-    def sysref(self):
-        """SYSREF Frequency
+    def sysref(self) -> int:
+        """SYSREF Frequency in Hz.
 
         Returns:
-            float: computed sysref frequency
+            int: computed sysref frequency
         """
         r1 = self._get_val(self.config["r1"])
         k = self._get_val(self.config["k"])
@@ -248,7 +253,12 @@ def sysref(self):
         return sysref_src / (2 * k)
 
     @sysref.setter
-    def sysref(self, value: Union[int, float]):
+    def sysref(self, value: Union[int, float]) -> None:
+        """Set sysref frequency.
+
+        Args:
+            value (int, float): Frequency
+        """
         self._sysref = int(value)
 
     def get_config(self, solution: CpoSolveResult = None) -> Dict:
@@ -385,7 +395,10 @@ def _get_clock_constraint(
         return self.vcxo / self.config["r1"] * self.config["n2"] / od
 
     def set_requested_clocks(
-        self, vcxo: int, out_freqs: List, clk_names: List[str],
+        self,
+        vcxo: int,
+        out_freqs: List,
+        clk_names: List[str],
     ) -> None:
         """Define necessary clocks to be generated in model.
 
@@ -410,12 +423,10 @@ def set_requested_clocks(
             else:
                 sysref_src = self.vcxo / self.config["r1"]
 
-            self._add_equation(
-                [sysref_src / (2 * self.config["k"]) == self._sysref]
-            )
+            self._add_equation([sysref_src / (2 * self.config["k"]) == self._sysref])
 
         # Add requested clocks to output constraints
-        for out_freq, name in zip(out_freqs, clk_names):
+        for out_freq, name in zip(out_freqs, clk_names):  # noqa: B905
             # od = self.model.Var(integer=True, lb=1, ub=256, value=1)
             od = self._convert_input(self._d, f"d_{name}_{out_freq}")
             # od = self.model.sos1([n*n for n in range(1,9)])
diff --git a/adijif/converters/ad9081.py b/adijif/converters/ad9081.py
index d734117..d6a8889 100644
--- a/adijif/converters/ad9081.py
+++ b/adijif/converters/ad9081.py
@@ -349,13 +349,10 @@ def __init__(
         self.set_quick_configuration_mode("3.01", "jesd204b")
 
     def _converter_clock_config(self) -> None:
-        """RX specific configuration of internall PLL config.
+        """RX specific configuration of internal PLL config.
 
         This method will update the config struct to include
         the RX clocking constraints
-
-        Raises:
-            Exception: If solver is not valid
         """
         adc_clk = self.decimation * self.sample_clock
         self.config["l"] = self._convert_input([1, 2, 3, 4], "l")
@@ -470,15 +467,10 @@ def _converter_clock_config(self) -> None:
 
         This method will update the config struct to include
         the TX clocking constraints
-
-        Raises:
-            Exception: If solver is not valid
         """
         dac_clk = self.interpolation * self.sample_clock
         self.config["dac_clk"] = self._convert_input(dac_clk)
-        self.config["converter_clk"] = self._add_intermediate(
-            self.config["dac_clk"]
-        )
+        self.config["converter_clk"] = self._add_intermediate(self.config["dac_clk"])
 
 
 class ad9081(ad9081_core):
@@ -550,9 +542,7 @@ def _converter_clock_config(self) -> None:
 
         self.config["dac_clk"] = self._convert_input(dac_clk)
         self.config["adc_clk"] = self._convert_input(adc_clk)
-        self.config["converter_clk"] = self._add_intermediate(
-            self.config["dac_clk"]
-        )
+        self.config["converter_clk"] = self._add_intermediate(self.config["dac_clk"])
 
         # Add single PLL constraint
         # JESD204B/C transmitter is a power of 2 divisor of the lane rate of
@@ -578,9 +568,6 @@ def get_required_clocks(self) -> List:
 
         Returns:
             List: List of solver variables, equations, and constants
-
-        Raises:
-            Exception: If direct clocking is used. Not yet implemented
         """
         # SYSREF
         self.config = {}
diff --git a/adijif/converters/adrv9009.py b/adijif/converters/adrv9009.py
index c506173..0e27eb6 100644
--- a/adijif/converters/adrv9009.py
+++ b/adijif/converters/adrv9009.py
@@ -4,9 +4,7 @@
 
 import numpy as np
 
-from adijif.common import core
 from adijif.converters.adrv9009_bf import adrv9009_bf
-from adijif.gekko_trans import gekko_translation
 
 from ..solvers import CpoModel  # type: ignore # noqa: I202,BLK100
 from ..solvers import GEKKO, CpoSolveResult
@@ -38,14 +36,14 @@ class adrv9009_core(converter, metaclass=ABCMeta):
     name = "ADRV9009"
 
     # JESD configurations
-    quick_configuration_modes = None # FIXME
+    quick_configuration_modes = None  # FIXME
     available_jesd_modes = ["jesd204b"]
     M_available = [1, 2, 4]
     L_available = [1, 2, 3, 4, 6, 8]
     N_available = [12, 16]
     Np_available = [12, 16, 24]
     F_available = [1, 2, 3, 4, 8]
-    S_available = [1] # FIXME?
+    S_available = [1]  # FIXME?
     K_available = [*np.arange(1, 32 + 1)]
     CS_available = [0]
     CF_available = [0]
@@ -105,6 +103,7 @@ def get_config(self, solution: CpoSolveResult = None) -> Dict:
             self.solution = solution
         return {}
 
+
 class adrv9009_clock_common(adrv9009_core, adrv9009_bf):
     """ADRV9009 class managing common singleton (Rx,Tx) methods."""
 
@@ -358,5 +357,8 @@ def get_required_clocks(self) -> List[Dict]:
             ]
         )
 
-        return [self.config["device_clock"], self.config["sysref_adc"],
-            self.config["sysref_dac"]]
+        return [
+            self.config["device_clock"],
+            self.config["sysref_adc"],
+            self.config["sysref_dac"],
+        ]
diff --git a/adijif/jesd.py b/adijif/jesd.py
index 794919a..8f0cb68 100644
--- a/adijif/jesd.py
+++ b/adijif/jesd.py
@@ -81,13 +81,13 @@ def validate_clocks(self) -> None:
             for name in ["bit", "sample"]:
                 clk = getattr(self, name + "_clock")
                 lim = getattr(self, name + "_clock_max")
-                assert (
-                    clk <= lim
-                ), name + f" clock too fast for device {clk} (limit: {lim})"
+                assert clk <= lim, (
+                    name + f" clock too fast for device {clk} (limit: {lim})"
+                )
                 lim = getattr(self, name + "_clock_min")
-                assert (
-                    clk >= lim
-                ), name + f" clock too slow for device {clk} (limit: {lim})"
+                assert clk >= lim, (
+                    name + f" clock too slow for device {clk} (limit: {lim})"
+                )
 
     @property
     def bit_clock_min(self) -> Union[int, float]:
diff --git a/adijif/system.py b/adijif/system.py
index d4e6e07..d3a4ce3 100644
--- a/adijif/system.py
+++ b/adijif/system.py
@@ -318,7 +318,6 @@ def solve(self) -> Dict:
             sys_refs = []
 
             for conv in convs:
-
                 if conv._nested:  # MxFE, Transceivers
                     for name in conv._nested:
                         serdes_used += getattr(conv, name).L
diff --git a/tests/test_bf.py b/tests/test_bf.py
index 76e3962..98e7d4b 100644
--- a/tests/test_bf.py
+++ b/tests/test_bf.py
@@ -534,21 +534,21 @@ def test_system_daq2_rx_ad9528():
             "Converter": np.array(1000000000),
             "ClockChip": [
                 {
-                    'm1': 4,
-                    'vco': 4000000000.0,
-                    'n2': 8,
-                    'r1': 1,
-                    'required_output_divs': 1.0,
-                    'fpga_pll_config': {
-                        'vco': 10000000000.0,
-                        'band': 1,
-                        'd': 1,
-                        'm': 1,
-                        'n': 20,
-                        'qty4_full_rate': 0,
-                        'type': 'QPLL',
+                    "m1": 4,
+                    "vco": 4000000000.0,
+                    "n2": 8,
+                    "r1": 1,
+                    "required_output_divs": 1.0,
+                    "fpga_pll_config": {
+                        "vco": 10000000000.0,
+                        "band": 1,
+                        "d": 1,
+                        "m": 1,
+                        "n": 20,
+                        "qty4_full_rate": 0,
+                        "type": "QPLL",
                     },
-                    'sysref_rate': 7812500.0,
+                    "sysref_rate": 7812500.0,
                 },
                 {
                     "m1": 4,
diff --git a/tests/test_clocks.py b/tests/test_clocks.py
index 8d6e56f..2502355 100644
--- a/tests/test_clocks.py
+++ b/tests/test_clocks.py
@@ -91,7 +91,6 @@ def test_ad9545_fail_no_solver():
 
 @pytest.mark.parametrize("solver", ["gekko", "CPLEX"])
 def test_ad9523_1_daq2_validate(solver):
-
     vcxo = 125000000
     n2 = 24
 
@@ -249,7 +248,6 @@ def test_ltc6953_validate():
 
 @pytest.mark.parametrize("solver", ["gekko", "CPLEX"])
 def test_ad9528_validate(solver):
-
     n2 = 10
     vcxo = 122.88e6
 
@@ -280,14 +278,13 @@ def test_ad9528_validate(solver):
 
 @pytest.mark.parametrize("solver", ["gekko", "CPLEX"])
 def test_ad9528_sysref(solver):
-
     n2 = 10
     vcxo = 122.88e6
 
     clk = adijif.ad9528(solver=solver)
 
     clk.n2 = n2
-    clk.k = [*range(500, 600)] # FIXME gekko fails to find a solution without this.
+    clk.k = [*range(500, 600)]  # FIXME gekko fails to find a solution without this.
     clk.use_vcxo_double = False
 
     clk.sysref = 120e3
diff --git a/tests/test_system.py b/tests/test_system.py
index 01aec1d..939b318 100644
--- a/tests/test_system.py
+++ b/tests/test_system.py
@@ -1,3 +1,5 @@
+# flake8: noqa
+
 import pytest
 
 import adijif
@@ -67,7 +69,7 @@ def test_nested_converter_lane_count_exceeds_fpga_lane_count():
     sys = adijif.system("adrv9009", "ad9528", "xilinx", 122.88e6)
 
     sys.fpga.setup_by_dev_kit_name("zcu102")
-    sys.fpga.max_serdes_lanes = fpga_L # Force it to break
+    sys.fpga.max_serdes_lanes = fpga_L  # Force it to break
 
     sys.converter.adc.sample_clock = 122.88e6
     sys.converter.dac.sample_clock = 122.88e6
@@ -80,5 +82,7 @@ def test_nested_converter_lane_count_exceeds_fpga_lane_count():
     sys.converter.adc.set_quick_configuration_mode(mode_rx, "jesd204b")
     sys.converter.dac.set_quick_configuration_mode(mode_tx, "jesd204b")
 
-    with pytest.raises(Exception, match=f"Max SERDES lanes exceeded. {fpga_L} only available"):
+    with pytest.raises(
+        Exception, match=f"Max SERDES lanes exceeded. {fpga_L} only available"
+    ):
         cfg = sys.solve()