Smart pixel optical receiver employing sense amplifier and method of operation thereof

• US 5,644,418 A
• Filed: 12/07/1995
• Issued: 07/01/1997
• Est. Priority Date: 12/07/1995
• Status: Expired due to Fees

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Woodward, Ted K.
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): BACARES, RAFAEL D
• Application Number:
  US08/570,171
• Time in Patent Office: 572 Days
• Field of Search: 359/189, 359/190, 359/191, 359/192, 359/194, 359/195, 250/214 A, 327/514
• US Class Current: 398/209
• CPC Class Codes: H04B 10/69 Electrical arrangements in the receiver
• CPC Class Codes: H04B 10/803 Free space interconnects, e.g. between circuit boards or chips

Abstract

An optical receiver, a method of converting an optical signal into an output electrical signal suitable for use by digital circuitry and an optoelectronic data processing system. The optical receiver includes: (1) an optical sensor for receiving an optical signal, generating in response thereto an analog electrical signal and transmitting the analog electrical signal therefore along an electrical path and (2) a sense amplifier having cross-coupled inverting amplifiers and a clock input, at least one of first and second inputs of the sense amplifier coupled to the electrical path, respectively, to allow the sense amplifier to detect the analog electrical signal when a clock signal at the clock input is high, regenerative feedback within the sense amplifier driving the first and second outputs to complementary logic levels when the clock signal is low, the clock signal controlling the regenerative feedback of the sense amplifier to amplify the analog electrical signal into an output electrical signal provided at the first and second outputs and suitable for use by digital circuitry operating as part of an optoelectronic data processing system.

Claims

1. An optical receiver, comprising:

an optical sensor for receiving an optical signal, generating in response thereto an analog electrical signal and transmitting said analog electrical signal therefrom along an electrical path; and

a sense amplifier having cross-coupled inverting amplifiers and a clock input, at least one of first and second inputs of said cross-coupled inverting amplifiers coupled to said electrical path to allow said sense amplifier to detect said analog electrical signal when a clock signal at said clock input is high, regenerative feedback within said sense amplifier driving first and second outputs of said cross-coupled inverting amplifiers to complementary logic levels when said clock signal is low, said clock signal controlling said regenerative feedback of said sense amplifier to amplify said analog electrical signal into said output electrical signal provided at said first and second outputs and suitable for use by digital circuitry.

2. The receiver as recited in claim 1 wherein said clock signal is selected from the group consisting of:

an electrical signal, and

an optical signal.

3. The receiver as recited in claim 1 wherein one of said first and second inputs is coupled to an electrical reference circuit.

4. The receiver as recited in claim 1 wherein said optical sensor is selected from the group consisting of:

a p-i-n photo diode, and

a metal semiconductor metal (MSM) photo diode.

5. The receiver as recited in claim 1 wherein said output electrical signal is provided at a complementary metal oxide semiconductor (CMOS) logic level.

6. The receiver as recited in claim 1 wherein said inverting amplifiers comprise a plurality of field effect transistors (FETs).

7. The receiver as recited in claim 1 wherein said analog electrical signal corresponds to a bit period of less than 10 nanoseconds.

8. A method of converting an optical signal into an output electrical signal suitable for use by digital circuitry, comprising the steps of:

receiving said optical signal into an optical sensor, said optical sensor generating in response thereto an analog electrical signal and transmitting said analog electrical signal to a sense amplifier having cross-coupled inverting amplifiers with first and second inputs and a clock input; and

detecting said analog electrical signal from said optical sensor in said sense amplifier when a clock signal at said clock input is high, regenerative feedback within said sense amplifier driving first and second outputs of said cross-coupled inverting amplifiers to complementary logic levels when said clock signal is low, said clock signal controlling said regenerative feedback of said sense amplifier to amplify said analog electrical signal into said output electrical signal provided at said first and second outputs and suitable for use by digital circuitry.

9. The method as recited in claim 8 wherein said clock signal is selected from the group consisting of:

an electrical signal, and

an optical signal.

10. The method as recited in claim 8 further comprising the step of coupling one of said first and second inputs to an electrical reference circuit.

11. The method as recited in claim 8 wherein said optical sensor is selected from the group consisting of:

a p-i-n photo diode, and

a metal semiconductor metal (MSM) photo diode.

12. The method as recited in claim 8 wherein said step of detecting comprises the step of providing said output electrical signal at a complementary metal oxide semiconductor (CMOS) logic level.

13. The method as recited in claim 8 wherein said inverting amplifiers comprise a plurality of field effect transistors (FETs).

14. The method as recited in claim 8 wherein said step of receiving comprises the step of generating an analog electrical signal corresponding to a bit period of less than 10 nanoseconds.

15. An optoelectronic data processing system, comprising:

electronic general purpose digital data processing and storage circuitry for receiving, processing, generating and transmitting data in electronic form; and

optical data communicating circuitry for communicating data with said electronic general purpose data processing and storage circuitry, said optical data communicating circuitry comprising optical transmitters and receivers coupled to one another by at least one optical bus, each of said optical receivers including;

an optical sensor for receiving an optical signal, generating in response thereto an analog electrical signal and transmitting said analog electrical signal therefrom along an electrical path, and

a sense amplifier having cross-coupled inverting amplifiers and a clock input, at least one of first and second inputs of said cross-coupled inverting amplifiers coupled to said electrical path to allow said sense amplifier to detect said analog electrical signal when a clock signal at said clock input is high, regenerative feedback within said sense amplifier driving first and second outputs of said cross-coupled inverting amplifiers to complementary logic levels when said clock signal is low, said clock signal controlling said regenerative feedback of said sense amplifier to amplify said analog electrical signal into said output electrical signal provided at said first and second outputs and suitable for use by said electronic general purpose digital data processing and storage circuitry.

16. The system as recited in claim 15 wherein said clock signal is selected from the group consisting of:

an electrical signal, and

an optical signal.

17. The system as recited in claim 15 wherein one of said first and second inputs is coupled to an electrical reference circuit.

18. The system as recited in claim 15 wherein said optical sensor is selected from the group consisting of:

a p-i-n photo diode, and

a metal semiconductor metal (MSM) photo diode.

19. The system as recited in claim 15 wherein said electronic general purpose digital data processing and storage circuitry is complementary metal oxide semiconductor (CMOS) circuitry, said output electrical signal being provided at a CMOS logic level.

20. The system as recited in claim 15 wherein analog electrical signal corresponds to a bit period of less than 10 nanoseconds.