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Boosted high gain, very wide common mode range, self-biased operational amplifier

Imported: 23 Feb '17 | Published: 22 Oct '02

Mel Bazes

USPTO - Utility Patents

Abstract

A boosted high gain, very wide common mode range, self-biased operational amplifier comprising complementary differential transistor pairs biased by biasing transistors and current mirrors, and comprising two amplifiers, each connected to bias an output cascode transistor so as to provide a very high amplifier output impedance, wherein the biasing transistors and current mirrors are all self-biased via negative feedback.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a circuit of an amplifier used as a building block in an embodiment of the present invention.

FIG. 2 is a circuit for an embodiment of the present invention incorporating the circuit of FIG.

1.

Claims

1. An amplifier comprising:

2. The amplifier as set forth in claim 1, wherein the second transistor of the first current mirror is coupled to be biased in saturation, and is coupled to bias the first transistor of the first current mirror and the non-inverting input node of the first amplifier at a bias voltage.

3. The amplifier as set forth in claim 1, further comprising:

4. The amplifier as set forth in claim 3, further comprising:

5. The amplifier as set forth in claim 4, further comprising:

6. The amplifier as set forth in claim 5, further comprising:

7. An operational amplifier to provide an output voltage as an amplified output of a differential of first and second input voltages, the operational amplifier comprising:

8. The operational amplifier as set forth in claim 7, wherein

9. The amplifier as set forth in claim 7, further comprising:

10. The operational amplifier as set forth in claim 9, wherein

11. The operational amplifier as set forth in claim 9, wherein

12. The operational amplifier as set forth in claim 11, further comprising:

13. An operational amplifier comprising:

14. The operational amplifier as set forth in claim 13, further comprising:

15. The operational amplifier as set forth in claim 14, further comprising:

16. The operational amplifier as set forth in claim 15, further comprising:

17. An amplifier comprising:

18. The amplifier as set forth in claim 17, wherein the second transistor of the first current mirror is coupled to be biased in saturation, and is coupled to bias the first transistor of the first current mirror and the non-inverting input node of the first amplifier at a bias voltage.

19. The amplifier as set forth in claim 17, further comprising:

20. The amplifier as set forth in claim 19, further comprising:

21. The amplifier as set forth in claim 20, further comprising:

22. The amplifier as set forth in claim 21, further comprising:

23. An operational amplifier to provide an output voltage as an amplified output of a differential of first and second input voltages, the operational amplifier comprising:

24. An amplifier comprising:

25. The amplifier as set forth in claim 24, further comprising:

26. The amplifier as set forth in claim 25, further comprising:

27. The amplifier as set forth in claim 26, further comprising:

28. An amplifier comprising:

29. The amplifier as set forth in claim 28, further comprising:

30. The amplifier as set forth in claim 29, further comprising:

31. The amplifier as set forth in claim 30, further comprising:

32. An amplifier comprising:

33. The amplifier as set forth in claim 32, further comprising:

34. The amplifier as set forth in claim 33, further comprising: