Method and system for split voltage domain receiver circuits

• US 9,553,676 B2
• Filed: 02/16/2016
• Issued: 01/24/2017
• Est. Priority Date: 10/02/2007
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Luxtera Incorporated (Cisco Systems, Inc.)
• Inventors: Welch, Brian
• Primary Examiner(s): DOBSON, DANIEL G
• Application Number:
  US15/045,216
• Publication Number:
  US 20160164614A1
• Time in Patent Office: 343 Days
• US Class Current: 1/1
• CPC Class Codes: G02B 6/4201 Packages, e.g. shape, construction, internal or external details
• CPC Class Codes: G02B 6/4242 Mounting of the optical light guide to the lid of the package
• CPC Class Codes: H04B 10/501 Structural aspects
• CPC Class Codes: H04B 10/516 Details of coding or modulation
• CPC Class Codes: H04B 10/564 Power control
• CPC Class Codes: H04B 10/60 Receivers
• CPC Class Codes: H04B 10/693 Arrangements for optimizing the preamplifier in the receiver
• CPC Class Codes: H04L 25/0272 Arrangements for coupling to multiple lines, e.g. for differential transmission
• CPC Class Codes: H04L 25/061 providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset removal of dc offset in coupling arrangements H04L25/029, H04L25/0296

Abstract

Methods and systems for split voltage domain receiver circuits are disclosed and may comprise amplifying received electrical signals in a plurality of partial voltage domains, and combining the amplified received signals, utilizing a stacked cascode amplifier for each partial voltage domain, into a single differential signal in a single voltage domain. The stacked cascode amplifiers may comprise a feedback loop having a comparator which controls a current source in each domain. The signals may be received from a photodiode, which may be integrated in the integrated circuit. The amplified signals may be combined via stacked common source or common emitter amplifiers. The received signals via may be amplified by stacked inverters. The amplified received signals may be AC or DC coupled prior to the combining. The received electrical signals may be amplified and combined via cascode amplifiers. The voltage domains may be stacked and may be controlled by feedback loops.

Claims

1. A method for processing signals, the method comprising:

in an integrated circuit;

amplifying received electrical signals in a plurality of partial voltage domains; and

combining said amplified received signals, utilizing a stacked cascode amplifier for each partial voltage domain, into a single differential signal in a single voltage domain, said stacked cascode amplifiers comprising a feedback loop having a comparator which controls a current source in each domain.

2. The method according to claim 1, comprising receiving said electrical signals from a photodiode monitored in a complementary mode.

3. The method according to claim 2, wherein said photodiode is integrated in said integrated circuit.

4. The method according to claim 1, comprising combining said amplified received signals via stacked common source amplifiers.

5. The method according to claim 1, comprising combining said amplified received signals via stacked common emitter amplifiers.

6. The method according to claim 1, comprising amplifying said received signals via stacked inverters.

7. The method according to claim 1, comprising DC coupling said amplified received signals prior to said combining.

8. The method according to claim 1, comprising AC coupling said amplified received signals prior to said combining.

9. The method according to claim 1, comprising amplifying and combining said received signals via cascode amplifiers.

10. The method according to claim 1, wherein said voltage domains are stacked.

11. The method according to claim 10, comprising controlling said stacked voltage domains via feedback loops.

12. A system for processing signals, the system comprising:

in an integrated circuit, one or more circuits operable to amplify received electrical signals in a plurality of partial voltage domains; and

said one or more circuits being operable to combine said amplified received signals into a single differential signal, utilizing a stacked cascode amplifier for each partial voltage domain, in a single voltage domain, said stacked cascode amplifiers comprising a feedback loop having a comparator which controls a current source in each domain.

13. The system according to claim 12, wherein said one or more circuits are operable to receive said electrical signals from a photodiode monitored in a complementary mode.

14. The system according to claim 13, wherein said photodiode is integrated in said integrated circuit.

15. The system according to claim 12, wherein said one or more circuits are operable to combine said amplified received signals via stacked common source amplifiers.

16. The system according to claim 12, wherein said one or more circuits combine said amplified received signals via stacked common emitter amplifiers.

17. The system according to claim 12, wherein said one or more circuits amplify said received signals via stacked inverters.

18. The system according to claim 12, wherein said one or more circuits are operable to DC couple said amplified received signals prior to said combining.

19. The system according to claim 12, wherein said one or more circuits are operable to AC couple said amplified received signals prior to said combining.

20. The system according to claim 12, wherein said one or more circuits are operable to amplify and combine said received signals via cascode amplifiers.

21. The system according to claim 12, wherein said voltage domains are stacked.

22. The system according to claim 12 wherein said one or more circuits are operable to control said stacked voltage domains via feedback loops.