Integrated circuit with single level routing

An integrated circuit comprising:

• a semiconductor layer comprising a resistor bank, the resistor bank comprising:
• a first resistor having a first end and a second end;
• a second resistor having a third end and a fourth end;
• a third resistor having a fifth end and a sixth end;
• and
• a fourth resistor having a seventh end and an eighth end;
• and
• a metal layer above the semiconductor layer, the metal layer comprising:
• a metal line traversing the first resistor, the second resistor, the third resistor, and the fourth resistor;
• a first coupling electrically connecting the first end of the first resistor and the seventh end of the fourth resistor;
• a second coupling electrically connecting the fifth end of the third resistor and the third end of the second resistor;
• and
• a third coupling electrically connecting the first coupling and the second coupling.

An integrated circuit comprising:

• a semiconductor layer comprising a resistor bank, the resistor bank comprising:
• a first resistor having a first end and a second end;
• a second resistor having a third end and a fourth end;
• a third resistor having a fifth end and a sixth end;
• and
• a fourth resistor having a seventh end and an eighth end;
• and
• a metal layer above the semiconductor layer, the metal layer comprising:
• a metal line, a first coupling, a second coupling, a third coupling, a fourth coupling, and a fifth coupling, the first coupling electrically connecting the second end of the first resistor and the eighth end of the fourth resistor, the second coupling electrically connecting the sixth end of the third resistor and the fourth end of the second resistor, the third coupling electrically connecting the first end of the first resistor and the seventh end of the fourth resistor, the fourth coupling electrically connecting the fifth end of the third resistor and the third end of the second resistor, and the fifth coupling electrically connecting the third coupling and the fourth coupling.